Attachment 3 Electr. Drawings & Calc.pdf

NOB

Electrical Drawing and

Calculations

69.12 kW

PV

Array x 320W SunPower modules x

SMA

SMC

7000HV-‐11

Inverters

Michael P. Stangl, P.E.

Renewable Power Design Group

P.O. Box 967

54 Holly Hill Road (packages)

Averill Park, NY 12018

USA

Michael P. Stangl, P.E. • Renewable Power Design Group • P.O. Box 967 • 54

Caddell Construction, Cos.

Tel.: +01 518 674-3684

Fax: +01 518 514-1212

E-Mail: MStangl@rpdg.us.com

NOB

92937

NOB with 9 x SMC 7000HV11

Location: Central Africa / Bujumbura

Grid voltage: 3~400 V

Project name:

Project number:

Project file:

System overview Part project 1

216 x Sunpower E19/320 (US) (PV Arrays for Entire Building)

Azimuth angle: -135 °, Angle of inclination: 7 °, Mounting type: Roof, PV Peak power: 69.12 kW

Inverters:

9 x SMC 7000HV-11 (Inverter efficiency: 95.2 %)

Technical data

Total number of PV modules:

PV Peak power: 69.12 kWp

Number of inverters: 9

Nominal AC power: 59.85 kW

Annual energy yield (approx.)*:

102.79 MWh

Energy usability factor: 100.0 %

Performance ratio (approx.

83.5 %

Spec. energy yield (approx.

1487 kWh/kWp

Line losses (in % of PV energy):

Unbalanced load: 0.00 VA

Notes:

Important: The yield values displayed are estimates. They are determined mathematically. SMA Solar Technology AG accepts no responsibility for the real yield value which can deviate from the yield values displayed here. Reasons for deviations are various outside conditions, such as soiling of the PV Modules or fluctuations in the efficiency of the PV modules.

Signature

Version: 2.00.4.R

System overview

Inverter: 9 x SMC 7000HV-11

PV-module:

A: (PV Arrays for Entire Building)

Sunpower

E19/320 (US)

Azimuth angle: -135 °, Angle of inclination: 7 °Mounting type: Roof

Technical data

Number of strings:

Number of PV modules (input):

Peak power (input):

Min. PV voltage:

Typical PV voltage:

Min. DC voltage (Grid voltage 230 V):

Max. PV voltage:

Max. DC voltage (PV):

Max. current of PV array:

Max. DC current:

PV Peak power:

Total number of PV modules:

Number of inverters:

Max. DC power (cos φ = 1):

Max. AC active power (cos φ = 1):

Grid voltage:

Nominal power ratio:

Displacement power factor cos φ:

69.12 kWp

7.50 kW

7.00 kW

230 V

98.0 %

PV/Inverter compatible

PV array and type of inverter are compatible. The nominal power ratio (max. DC power of the inverter divided by the peak power) is within the recommended range (90% - 110%).

There are probably specific grounding recommendations stated by the manufacturer for the selected PV modules.

Consult the manufacturer regarding current grounding recommendations. Please note that the grounding of the PV array takes place via a separate grounding set in the inverter.

PV-array:

Input A:

PV Arrays for Entire Building

7.68 kWp

374 V

395 V

335 V

554 V

600 V

17.6 A

23.0 A

Project name: NOB

Project number: 92937

Project file: NOB with 9 x SMC 7000HV11

Location: Central Africa / Bujumbura

Record Low Temperature: 0.00 °C

Average High Temperature: 31.00 °C

Record High Temperature: 40.00 °CPart project 1

Ambient temperature:

Evaluation of design

PV Electrical One-Line

P ro je ct

A fr ic a

N O

B

DRAWING

S ys te m

T o ta l:

8.

kW

D C

S

T C

S un po w er S

P R

-3

E -W

H T

-D st rin gs o f 8 p er in ve rt er

S

M C

H V

-1 in ve rt er s

M ou nt ed o n

S ch uc o

M od ul e

T ilt

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DATE

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In iti al D ra ft

C kd

2011-May-10 SCALE (11"x17")

PV-E01

SHOP DRAWING

Switchboard NOBSB-E

1000A, 400/230VAC

42kA Interrupt

(Existing)

80A, 3P

1000A

Sunny WebBox

Communication hub located inside Tower

A Internal power

Supply

PV Data Monitor Network

Array

DC

AC

DATA

AC

35'

141'

127'

127'

6-PV wire 4 mm2, #8G bare

¾” RGS, 6#10 THWN-2, #8 EGC

2" RGS, 4#1/0 THWN-2, 1#6 G

Shielded 4 conductor RS-485 cable in ¾”C

2" RGS, 4#1/0 THWN-2, 1#6 G

WIRING (Minimum Requirements)

Conduit & WireDescription ~LengthLabel

B

A

C

PAGE

144 Sunpower

SPR 320E-WHT-D

PV Modules

One array per inverter; Six arrays total;

Each array comprised of three strings of eight modules or 24 modules per inverter

Voc =518V , Isc = 6.24A

Location: rooftop Positive Ground

40A, 3P

A

B

D

C

E

Tower A – Breaker 22

Tower B – Breaker 23

B.01.1.08

INV

A.01.1.01

INV

A.06.3.01

TOWER.INVERTER.STRING.MODULE

INV

03 =

INV

Sunny Tower A

A.06.3.08

A

B

INV

B.01.1.01

INV

B.03.3.01

INV

B.03.3.08

Sunny Tower B

72 Sunpower

SPR 320E-WHT-D

PV Modules

One array per inverter; Three arrays total;

Each array comprised of three strings of eight modules or 24 modules per inverter

Voc = 518V , Isc = 6.24A

Location: rooftop Positive Ground

D E

NOBSG-E

2000A bus, CB#3, 1000A

NOBSG-E-U

„CBA‟

2000A

UTLSG-E

„CBA‟

3000A bus, CB#7, 2000A

UTLSG-E-U

„CB1‟

3000A

G

Transformer

15kVΔ :400/230Y

2MVA

A.01.1.08

Inverters are connected Phase to Neutral

Exterior AC

Disconnect

Square D HU363RB

100A, 600VAC,

isolated neutral, NEMA 3R

(provided by others)

Transition Boxes A.01 A.06 B.01 B.03

M

P S

-0 3-

S ho p

D ra w in g R ev ie w

C G

LB

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U ps iz e

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B , A

C r un fo r fu tu re e xp an si on

Sunny Tower “A”

6 x SMC 7000HV -11 Inverters (all used)

Sunny Tower “B”

6 x SMC 7000HV -11 Inverters

(3 used / 3 spare)

Exterior AC

Disconnect

Square D HU363RB

100A, 600VAC,

isolated neutral, NEMA 3R

(provided by others)

KEY

TOWER.INVERTER.STRING.MODULE

Example A.01.02.07 Sunny Tower A, Inverter 01, String 2, Module 7

M

P S

-0 5-

S ho p

D ra w in g R ev ie w

SHOP DRAWING

1) System shall conform to 2008 NEC, state and local Code requirements, electric utility co. requirements and manufacturers' instructions.

2) RMC (RGS) conduit and copper conductors required unless otherwise noted.

3) All conductors shall have THWN-2 (90°C) rating to ensure Code compliance, including #10 conductors.

4) All conductors shall have continuous insulation color unless #4 AWG or larger.

5) DC color coding to be black for ungrounded conductor, white for grounded conductor, and green for grounding conductor.

6) AC disconnects located adjacent to respective Tower units.

7) All connections from wire troughs to PV combiners, PV disconnects or PV inverters shall be made through conduit nipples.

8) Connections to the top of NEMA 3R or NEMA 4/4X troughs and junction boxes shall be made with listed weathertight connectors to maintain the enclosure's rating.

9) All disconnects and other equipment shall be marked and labeled as required by the 2008 NEC and all applicable state and local Codes.

10) The conduit systems shall be laid out, designed, furnished and installed to compensate for thermal expansion and contraction in accordance with 2008 NEC Article 300.7. RGS raintight expansion & contraction fittings shall be provided as directed in the field. RGS conduits to be galvanized and installed in accordance with NEC 344. All fittings shall be raintight on roof.

11) Rooftop conduits shall be installed a minimum of 3½" above the roof surface (measured to bottom of raceway).

12) The Electrical Contractor shall perform insulation resistance testing on all conductors. All readings shall be documented and provided as a report to RESC.

13) Structural review of roof by others.

14) Locks or padlocks shall be installed to secure all equipment unless location is accessible to qualified persons only.

15) At point of penetration from exterior to interior, install raceway fittings at suitable and accessible locations and fill them with sealing compound.

16) All grounding electrode conductors shall be installed in single continuous lengths except where spliced by irreversible connector or exothermic weld.

17) Maximum DC voltage calculated using module temperature coefficient for VOC.

18) Inverters connected ph to N

GENERAL NOTES (APPLY TO ALL SHEETS)

All Tower A

All Tower B

18A

18A

438 VDC

438 VDC

19A

19A

572 VDC

572VDC

61A/ph

30.43A/ph

230/400

230/400

INVERTER LABELING

DC ImaxDC Iop DC VopInverter DC Vmax AC Iop AC Vop

PV Electrical One-Line

P ro je ct

A fr ic a

N O

B

DRAWING

S ys te m

T o ta l:

8.

kW

D C

S

T C

S un po w er S

P R

-3

E -W

H T

-D st rin gs o f 8 p er in ve rt er

S

M C

H V

-1 in ve rt er s

M ou nt ed o n

S ch uc o

M od ul e

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DATE

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2011-May-10 SCALE (11"x17")

PV-E01

PAGE

Wiley Electronics ACE Box

Transition box from module USE-2 conductors to THWN-2 insulated conductors One transition box per inverter

– three PV strings per transition box, labeled per drawing

TO PV

MODULES

TO

INVERTER

TRANSITION BOX DETAIL

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D ra w in g R ev

Project 92937 Prepared by RESC NOB Tower A Date 5/9/11

Conductor Sizing and Overcurrent Device Ratings = user input needed

Step 1 - Determine Continuous Circuit Voltage

Step 1A SOURCE CIRCUIT 1 Based on IAEI News Article Isc = 6.24 A Sunpower SPR-320E "Conductor Sizing and OverCurrent Device Ratings" Vmp 54.7 V x 8 = 437.60 V Isc = 6.24 A by John Wiles (Jan./Feb. 2011) Vms 69.215 V x 1 x 8 = 553.72 V Imp = 5.86 A Imp = 5.86 A Voc = 64.8 V Step 1 Determine the continuous current in the circuit NEC Isc 6.24 A x 1.56 = 9.73 A Vmp = 54.7 V A. PV DC Circuits

6.24 A x 1.25 = 7.8 A Fuse = 20 A B. AC Inverter Output Circuits OUTPUT CIRCUIT 1 Voltage Temp Coeff -176.6 mV Isc 6.24 A x 3 = 18.72 A Step 2 Calculate the rating of the overcurrent device where required Vmp = 437.60 V Operating Conditions A. Rating determined from Continuous Currents Vms = 553.72 V Record low temperature 0 deg C B. Operating Temperature Affects Rating Imp 5.86 A x 3 = 17.58 A Highest Avg Monthly Temperature 31 deg C NEC Isc 18.72 A x 1.56 = 29.20 A Step 3 Select Conductor Size

18.72 A x 1.25 = 23.40 A A. Ampacity Requirements

Step 1B INVERTER 1 B. 125% Requirement

7000 W / 230 x 1.25 = 38.04 A Low Temperature Voc Correction 7000 W / 230 = 30.43 A String Voc 518.4 VDC Step 4 Terminal Temperature Limits

SMA SMC7000HV-11 Temp coefficient -176.6 mV/C deg Record low 0 Deg C Step 5 Verify that the overcurrent device protects the Temp diff from STC -25 Deg C conductor selected under the conditions of use.

Step 1B ST6 21000 W 230 V = 91.304348 AAC String Calcs

91.304348 A / 3 ph = 30.43 A per ph Voltage increase 35.32 VDC

Voc (temp corrected) 553.72 VDC

30.43 A x 1.25 NEC = 38.04 Max inverter DC input 800 VDC

LABELING

230 AC Operating V

30.43 AC Operating I

69.215 Voc per mod, 2008 NEC temp corrected

553.72 Voc (temp corrected) per string

518.4 uncorrected Voc

553.72 DC Max V

7.8 DC max I

437.60 DC Operating V

5.86 DC Operating I

Module Information

NOB Tower A Date 5/11/11

DC Conductor Sizing and Verification of OCP Device AC Conductor Sizing and Verification of OCP Device

THWN-2 Conductor THWN-2 Conductor THWN-2 Conductor T310.16 Table 310.15 (B)(2)(c ) ACME Junction Box to Inverter Each Inverter inside Sunny Tower Sunny Tower to Solar Backfeed Breaker Distance above roof to bottom of Conduit Temp Adder

Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) Source Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) deg C deg C deg F Inverters connected ph to N 21-25 1.04 0 to 13 mm (1/2") 33 60

141 LF (maximum DC conductor length) Drawings AC run 2 Inverters per phase 26-30 1 Above 13 mm to 90 mm 1/2" to 3 1/2" 22 40

437.60 Vmps 5 127 ft 31-35 0.96 Above 90 mm to 300 mm 3 1/2" to 12" 17 30

5.86 Imp one string 230 VAC 230 VAC 36-40 0.91 Above 300 mm to 900 mm 12" to 36" 14 25

9.73 Isc NEC 38.04 AAC NEC 76.09 AAC NEC 41-45 0.87

7.80 Isc Continuous 30.43 AAC Continuous 60.87 AAC Continuous 46-50 0.82

Voltage drop Vmp * Imp Voltage Drop Vdrop combined 51-55 0.76 10 AWG Conductor Size User selected 8 AWG Conductor Size 1/0 AWG Conductor Size 56-60 0.71

141.00 DC run in feet 5.00 AC run in feet 127 AC run combiner to POC 61-70 0.58

5.86 Imp of source ckt 30.43 AC Imp 60.87 AC Imp 71-80 0.41

0.47% Vdrop Chosen from Voltage Drop DC worksheet Chap. 9, Table 8 0.10% Voltage drop AC 0.92% 0.82% AC Vdrop combined

Step 2 Step 2 Step 2

38.0 76.1

Table 310.15(B)(2)(a) - Conduit Fill Correction Factors Use 40 Amp Breaker Use 80 Amp Breaker # of current carrying conductors

4 to 6 80 7 to 9 70 10 to 20 50 21 to 30 45

Step 3A Select Conductor Size (Ampacity) Step 3A Select Conductor Size (Ampacity) Step 3A Select Conductor Size (Ampacity) 31 to 40 40 10 AWG Conductor Size 8 AWG Conductor Size 1/0 AWG Conductor Size 41 and above 35 40 amps Conductor rating at 90 deg C Table 310.16 55 amps Conductor rating at 90 deg C 170 amps Conductor rating at 90 deg C

31 31 31

22 Table 310.15 (B)(2)(c ) 22

53 53

0.76 Table 310.16 0.76

0.76

30.40 42 129.20

6 # current carrying conductors in conduit Three strings x 2 (plus, minus) and EG

2 # current carrying of conductors in conduit

L1 , N and EG 4 # of current carrying conductors in conduit

L1, L2, L3, N and EG

0.8 derate for conduit fill Table 310.15(B)(2)(a) 1 derate for conduit fill 0.8 derate for conduit fill

24.32 amps Conductor Operating Capacity 41.80 amps Conductor Operating Capacity 103.36 amps Conductor Operating Capacity

15.60 amps Continuous Current (Strings in parallel minus one) 30.43 amps Continuous Current 60.87 amps Continuous Current

Yes Is Conductor Operating Capacity > Continuous Current Yes Is Conductor Operating Capacity > Continuous Current Yes Is Conductor Operating Capacity > Continuous Current

Step 3B Select Conductor Size (125% Requirement) Step 3B Select Conductor Size (125% Requirement) Step 3B Select Conductor Size (125% Requirement) 10 AWG Conductor Size 8 AWG Conductor Size 1/0 AWG Conductor Size 40 amps Conductor Rating at 90 Deg C Table 310.16 55 amps Conductor Rating at 90 Deg C 170 amps Conductor Rating at 90 Deg C

19.5 38 76

Yes Yes Yes

Step 3 Final Conductor Selection Step 3 Final Conductor Selection Step 3 Final Conductor Selection 10 AWG Conductor Size (Ampacity Requirement) 8 AWG Conductor Size (Ampacity Requirement) 1/0 AWG Conductor Size (Ampacity Requirement) 10 AWG Conductor Size (125% Requirement) 8 AWG Conductor Size (125% Requirement) 1/0 AWG Conductor Size (125% Requirement) 10 AWG Use Larger Conductor Size 8 AWG Use Larger Conductor Size 1/0 AWG Use Larger Conductor Size

Step 4 Check Terminal Temperature Limits Step 4 Step 4

10 AWG Chosen Conductor Size from Step 3 8 AWG Chosen Conductor Size from Step 3 1/0 AWG Chosen Conductor Size from Step 3

35 amps Conductor Rating at 75 deg C Table 310.16 50 amps Conductor Rating at 75 deg C 150 amps Conductor Rating at 75 deg C

19.5 38.0 76.1

Yes Yes Yes

Step 5 Check for OCP Device Sizing to protect conductor under actual operating conditions Step 5 Check OCP Device Sizing Step 5 Check OCP Device Sizing A. Normal method for choosing OCP Device A. Normal Method for Choosing OCP Device

No OCP required. 38.0 amps 125% of Continuous Current 76.1 amps 125% of Continuous Current Round up to Breaker Size Round up to Breaker Size

40 amps Chosen Breaker 80 amps Chosen Breaker Conduit Fill Annex C, Table C.8 Need 6 current carrying #10 THWN-2 Max. number of conductors B. Checking OCP Device to protect conductor under actual operating conditions B. Checking OCP Device to protect conductor under actual operating conditions 3/4" RMC (RGS) is good for 10 in rigid metal conduct (RMC) Check Chosen Conductor Capacity under actual operating condiitons Check Chosen Conductor Capacity under actual operating condiitons

8 AWG Conductor Size 1/0 AWG Conductor Size 55 amps Conductor rating at 90 deg C 170 amps Conductor rating at 90 deg C

31 31 22 22 53 53

0.76 0.76 42 129

2 # current carrying of conductors in conduitL1 , N and EG 4 # current carrying of conductors in conduitL1 ,L2, L3 and N and EG 1 derate for conduit fill 0.8 derate for conduit fill

42 amps Conductor Operating Capacity 103 amps Conductor Operating Capacity

45 110

Yes Is Chosen Breaker in "A" smaller than Max possible breaker "B" Yes Is Chosen Breaker in "A" smaller than Max possible breaker in "B" If "NO", have to use a larger conductor size If "NO", have to use a larger conductor size

Conduit Fill Conduit fill Need 6 current carrying # 8 THWN-2 Need 4 #1/0 THWN-2 1" RMC (RGS) is good for 9 2" RMC (RGS) good for 7 deg C (Estimated Operating Temperature) on roof amps - Maximum possible breaker that could be used based on Conductor Operating Capacity

Ambient avg high temperature (deg C) deg C (Estimated Operating Temperature) on roof amps - Maximum possible breaker that could be used based on Conductor Operating Capacity

Temperature Added for operating conditions (deg C) assuming

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

Temperature Added for operating conditions (deg C)

Temperature correction factor amps (temperature adjusted ampacity of selected amps 125% of Continuous Current

Check Terminal Temperature Limits Check Terminal Temperature Limits amps 125% of Continuous Current

Ambient avg high temperature (deg C)

Is conductor rating (@75 deg C) capacity > 125% of Continuous Current

Is current rating (@75 deg C) capacity > 125% of Continuous Current

String fusing not necessary because continuos current of 2 strings in parallel (15.6 amps) is less than module module manufacturer OCP requirements (20 amps)

Calculate the Rating of the Overcurrent Protection Device, where requiredCalculate the Rating of the Overcurrent Protection Device, where required Calculate the Rating of the Overcurrent Protection Device, where required

125% of continuous current

Temperature Correction Factors

THWN-2, Cu

Ambient avg high temperature (deg C) deg C (Estimated Operating Temperature) on roof

Ambient avg high temperature (deg C) ft from inverter to Sunny Tower

% of values

125% of continuous current

See Step 2

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface amps (temperature adjusted ampacity of selected conductor) deg C (Estimated Operating Temperature) on roof

Temperature correction factor amps 125% of Continuous Current (strings in parallel minus one) Is conductor rating (90 deg C) >125% of continuous current amps 125% of Continuous Current (strings in parallel

Is conductor rating (@75 deg C) capacity > 125% of Continuous Current

Ambient avg high temperature (deg C) amps 125% of Continuous Current

Is conductor rating (90 deg C) >125% of continuous current amps 125% of Continuous Current

Is conductor rating (90 deg C) >125% of continuous current

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface deg C (Estimated Operating Temperature) on roof

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

NOB Tower B Date 5/9/11

Conductor Sizing and Overcurrent Device Ratings = user input needed

Step 1 - Determine Continuous Circuit Voltage

Step 1A SOURCE CIRCUIT 1 Based on IAEI News Article Isc = 6.24 A Sunpower SPR-320E "Conductor Sizing and OverCurrent Device Ratings" Vmp 54.7 V x 8 = 437.60 V Isc = 6.24 A by John Wiles (Jan./Feb. 2011) Vms 69.215 V x 1 x 8 = 553.72 V Imp = 5.86 A Imp = 5.86 A Voc = 64.8 V Step 1 Determine the continuous current in the circuit NEC Isc 6.24 A x 1.56 = 9.73 A Vmp = 54.7 V A. PV DC Circuits

6.24 A x 1.25 = 7.8 A Fuse = 20 A B. AC Inverter Output Circuits OUTPUT CIRCUIT 1 Voltage Temp Coeff -176.6 mV Isc 6.24 A x 3 = 18.72 A Step 2 Calculate the rating of the overcurrent device where required Vmp = 437.60 V Operating Conditions A. Rating determined from Continuous Currents Vms = 553.72 V Record low temperature 0 deg C B. Operating Temperature Affects Rating Imp 5.86 A x 3 = 17.58 A Highest Avg Monthly Temperature 31 deg C NEC Isc 18.72 A x 1.56 = 29.20 A Step 3 Select Conductor Size

18.72 A x 1.25 = 23.40 A A. Ampacity Requirements

Step 1B INVERTER 1 B. 125% Requirement

7000 W / 230 x 1.25 = 38.04 A Low Temperature Voc Correction 7000 W / 230 = 30.43 A String Voc 518.4 VDC Step 4 Terminal Temperature Limits

SMA SMC7000HV-11 Temp coefficient -176.6 mV/C deg Record low 0 Deg C Step 5 Verify that the overcurrent device protects the Temp diff from STC -25 Deg C conductor selected under the conditions of use.

Step 1B ST6 21000 W 230 V = 91.304348 AAC String Calcs

91.304348 A / 3 ph = 30.43 A per ph Voltage increase 35.32 VDC

Voc (temp corrected) 553.72 VDC

30.43 A x 1.25 NEC = 38.04 Max inverter DC input 800 VDC

LABELING

230 AC Operating V

30.43 AC Operating I

69.215 Voc per mod, 2008 NEC temp corrected

553.72 Voc (temp corrected) per string

518.4 uncorrected Voc

553.72 DC Max V

7.8 DC max I

437.60 DC Operating V

NOB Tower B Date 5/11/11

DC Conductor Sizing and Verification of OCP Device AC Conductor Sizing and Verification of OCP Device

THWN-2 Conductor THWN-2 Conductor THWN-2 Conductor T310.16 Table 310.15 (B)(2)(c ) ACME Junction Box to Inverter Each Inverter inside Sunny Tower Sunny Tower to Solar Backfeed Breaker Distance above roof to bottom of Conduit Temp Adder

Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) Source Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) deg C deg C deg F Inverters connected ph to N 21-25 1.04 0 to 13 mm (1/2") 33 60

141 LF (maximum DC conductor length) Drawings AC run 2 Inverters per phase See Note 1 26-30 1 Above 13 mm to 90 mm 1/2" to 3 1/2" 22 40

437.60 Vmps 5 127 ft 31-35 0.96 Above 90 mm to 300 mm 3 1/2" to 12" 17 30

5.86 Imp one string 230 VAC 230 VAC 36-40 0.91 Above 300 mm to 900 mm 12" to 36" 14 25

9.73 Isc NEC 38.04 AAC NEC 76.09 AAC NEC 41-45 0.87

7.80 Isc Continuous 30.43 AAC Continuous 60.87 AAC Continuous 46-50 0.82

Voltage drop Vmp * Imp Voltage Drop Vdrop combined 51-55 0.76 10 AWG Conductor Size User selected 8 AWG Conductor Size 1/0 AWG Conductor Size 56-60 0.71

141.00 DC run in feet 5.00 AC run in feet 127 AC run combiner to POC 61-70 0.58

5.86 Imp of source ckt 30.43 AC Imp 60.87 AC Imp 71-80 0.41

0.47% Vdrop Chosen from Voltage Drop DC worksheet Chap. 9, Table 8 0.10% Voltage drop AC 0.92% 0.82% AC Vdrop combined

Step 2 Step 2 Step 2

38.0 76.1

Table 310.15(B)(2)(a) - Conduit Fill Correction Factors Use 40 Amp Breaker Use 80 Amp Breaker See Note 2 # of current carrying conductors

4 to 6 80 7 to 9 70 10 to 20 50 21 to 30 45

Step 3A Select Conductor Size (Ampacity) Step 3A Select Conductor Size (Ampacity) Step 3A Select Conductor Size (Ampacity) 31 to 40 40 10 AWG Conductor Size 8 AWG Conductor Size 1/0 AWG Conductor Size 41 and above 35 40 amps Conductor rating at 90 deg C Table 310.16 55 amps Conductor rating at 90 deg C 170 amps Conductor rating at 90 deg C

31 31 31

22 Table 310.15 (B)(2)(c ) 22

53 53

0.76 Table 310.16 0.76

0.76

30.40 42 129.20

6 # current carrying conductors in conduit Three strings x 2 (plus, minus) and EG

2 # current carrying of conductors in conduit

L1 , N and EG 4 # of current carrying conductors in conduit

L1, L2, L3, N and EG

0.8 derate for conduit fill Table 310.15(B)(2)(a) 1 derate for conduit fill 0.8 derate for conduit fill

24.32 amps Conductor Operating Capacity 41.80 amps Conductor Operating Capacity 103.36 amps Conductor Operating Capacity

15.60 amps Continuous Current (Strings in parallel minus one) 30.43 amps Continuous Current 60.87 amps Continuous Current

Yes Is Conductor Operating Capacity > Continuous Current Yes Is Conductor Operating Capacity > Continuous Current Yes Is Conductor Operating Capacity > Continuous Current

Step 3B Select Conductor Size (125% Requirement) Step 3B Select Conductor Size (125% Requirement) Step 3B Select Conductor Size (125% Requirement) 10 AWG Conductor Size 8 AWG Conductor Size 1/0 AWG Conductor Size 40 amps Conductor Rating at 90 Deg C Table 310.16 55 amps Conductor Rating at 90 Deg C 170 amps Conductor Rating at 90 Deg C

19.5 38 76

Yes Yes Yes

Step 3 Final Conductor Selection Step 3 Final Conductor Selection Step 3 Final Conductor Selection 10 AWG Conductor Size (Ampacity Requirement) 8 AWG Conductor Size (Ampacity Requirement) 1/0 AWG Conductor Size (Ampacity Requirement) 10 AWG Conductor Size (125% Requirement) 8 AWG Conductor Size (125% Requirement) 1/0 AWG Conductor Size (125% Requirement) 10 AWG Use Larger Conductor Size 8 AWG Use Larger Conductor Size 1/0 AWG Use Larger Conductor Size

Step 4 Check Terminal Temperature Limits Step 4 Step 4

10 AWG Chosen Conductor Size from Step 3 8 AWG Chosen Conductor Size from Step 3 1/0 AWG Chosen Conductor Size from Step 3

35 amps Conductor Rating at 75 deg C Table 310.16 50 amps Conductor Rating at 75 deg C 150 amps Conductor Rating at 75 deg C

19.5 38.0 76.1

Yes Yes Yes

Step 5 Check for OCP Device Sizing to protect conductor under actual operating conditions Step 5 Check OCP Device Sizing Step 5 Check OCP Device Sizing A. Normal method for choosing OCP Device A. Normal Method for Choosing OCP Device

No OCP required. 38.0 amps 125% of Continuous Current 76.1 amps 125% of Continuous Current Round up to Breaker Size Round up to Breaker Size

40 amps Chosen Breaker 80 amps Chosen Breaker Conduit Fill Annex C, Table C.8 Need 6 current carrying #10 THWN-2 Max. number of conductors B. Checking OCP Device to protect conductor under actual operating conditions B. Checking OCP Device to protect conductor under actual operating conditions 3/4" RMC (RGS) is good for 10 in rigid metal conduct (RMC) Check Chosen Conductor Capacity under actual operating condiitons Check Chosen Conductor Capacity under actual operating condiitons

8 AWG Conductor Size 1/0 AWG Conductor Size 55 amps Conductor rating at 90 deg C 170 amps Conductor rating at 90 deg C

31 31 22 22 53 53

0.76 0.76 42 129

2 # current carrying of conductors in conduitL1 , N and EG 4 # current carrying of conductors in conduitL1 ,L2, L3 and N and EG 1 derate for conduit fill 0.8 derate for conduit fill

42 amps Conductor Operating Capacity 103 amps Conductor Operating Capacity

45 110

Yes Is Chosen Breaker in "A" smaller than Max possible breaker "B" Yes Is Chosen Breaker in "A" smaller than Max possible breaker in "B" If "NO", have to use a larger conductor size If "NO", have to use a larger conductor size

Conduit Fill Conduit fill Need 6 current carrying # 8 THWN-2 Need 4 #1/0 THWN-2 1" RMC (RGS) is good for 9 2" RMC (RGS) good for 7 deg C (Estimated Operating Temperature) on roof amps - Maximum possible breaker that could be used based on Conductor Operating Capacity

Ambient avg high temperature (deg C) deg C (Estimated Operating Temperature) on roof amps - Maximum possible breaker that could be used based on Conductor Operating Capacity

Temperature Added for operating conditions (deg C) assuming

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

Temperature Added for operating conditions (deg C)

Temperature correction factor amps (temperature adjusted ampacity of selected amps 125% of Continuous Current

Check Terminal Temperature Limits Check Terminal Temperature Limits amps 125% of Continuous Current

Ambient avg high temperature (deg C)

Is conductor rating (@75 deg C) capacity > 125% of Continuous Current

Is current rating (@75 deg C) capacity > 125% of Continuous Current

String fusing not necessary because continuos current of 2 strings in parallel (15.6 amps) is less than module module manufacturer OCP requirements (20 amps)

Calculate the Rating of the Overcurrent Protection Device, where requiredCalculate the Rating of the Overcurrent Protection Device, where required Calculate the Rating of the Overcurrent Protection Device, where required

125% of continuous current

Temperature Correction Factors

THWN-2, Cu

Ambient avg high temperature (deg C) deg C (Estimated Operating Temperature) on roof

Ambient avg high temperature (deg C) Note 1 - Sunny Tower AC output conductors based on the assumption that three additional SMC 7000HV-11 inverters may be added to the tower at a later date

Note 2 - Will install 40 amp, 3 phase solar backfeed breaker on distribution panel. Only one inverter per phase will be used initially on Sunny Tower "B". Solar backfeed breaker will have to be increased to an 80 amps breaker if additional three inverters are added to Sunny Tower "B" at a later date.

ft from inverter to Sunny Tower

% of values

125% of continuous current

See Step 2

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface amps (temperature adjusted ampacity of selected conductor) deg C (Estimated Operating Temperature) on roof

Temperature correction factor amps 125% of Continuous Current (strings in parallel minus one) Is conductor rating (90 deg C) >125% of continuous current amps 125% of Continuous Current (strings in parallel

Is conductor rating (@75 deg C) capacity > 125% of Continuous Current

Ambient avg high temperature (deg C) amps 125% of Continuous Current

Is conductor rating (90 deg C) >125% of continuous current amps 125% of Continuous Current

Is conductor rating (90 deg C) >125% of continuous current

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface deg C (Estimated Operating Temperature) on roof

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface

Temperature correction factor

MSGQ

Building

Electrical Drawing and Calculations

15.36 kW

PV

Array x 320W SunPower modules x

SMA

SMC

5000A Inverters

P.O. Box 967

54 Holly Hill Road (packages)

Averill Park, NY 12018

USA

Michael P. Stangl, P.E. • Renewable Power Design Group • P.O. Box 967 • 54

Tel.: +01 518 674-3684

Fax: +01 518 514-1212

E-Mail: MStangl@rpdg.us.com

MSGQ - Burundi

92937

MSGQ with 3 x SMC 5000A

Location: Central Africa / Bujumbura

Grid voltage: 3~400 V

Project name:

Project number:

Project file:

System overview Part project 1

48 x Sunpower E19/320 (US) (MSGQ Buliding)

Azimuth angle: -135 °, Angle of inclination: 7 °, Mounting type: Roof, PV Peak power: 15.36 kW

Inverters:

3 x SMC 5000A (Inverter efficiency: 95.0 %)

Technical data

Total number of PV modules:

PV Peak power: 15.36 kWp

Number of inverters: 3

Nominal AC power: 15.00 kW

Annual energy yield (approx.)*:

22771.10 kWh

Energy usability factor: 100.0 %

Performance ratio (approx.

83.2 %

Spec. energy yield (approx.

1482 kWh/kWp

Line losses (in % of PV energy):

Unbalanced load: 0.00 VA

Notes:

Important: The yield values displayed are estimates. They are determined mathematically. SMA Solar Technology AG accepts no responsibility for the real yield value which can deviate from the yield values displayed here. Reasons for deviations are various outside conditions, such as soiling of the PV Modules or fluctuations in the efficiency of the PV modules.

Inverter: 3 x SMC 5000A

PV-module:

A: (MSGQ Buliding)

Sunpower

E19/320 (US)

Azimuth angle: -135 °, Angle of inclination: 7 °Mounting type: Roof

Technical data

Number of strings:

Number of PV modules (input):

Peak power (input):

Min. PV voltage:

Typical PV voltage:

Min. DC voltage (Grid voltage 230 V):

Max. PV voltage:

Max. DC voltage (PV):

Max. current of PV array:

Max. DC current:

PV Peak power:

Total number of PV modules:

Number of inverters:

Max. DC power:

Max. AC power:

Grid voltage:

Nominal power ratio:

15.36 kWp

5.75 kW

5.50 kW

230 V

112.0 %

PV/Inverter conditionally compatible

PV array and inverter type are only partly compatible since the inverter is over-dimensioned for this combination (> 110 %).

There are probably specific grounding recommendations stated by the manufacturer for the selected PV modules.

Consult the manufacturer regarding current grounding recommendations. Please note that the grounding of the PV array takes place via a separate grounding set in the inverter.

PV-array:

Input A:

MSGQ Buliding

5.12 kWp

374 V

395 V

246 V

554 V

600 V

11.7 A

26.0 A

Project name: MSGQ - Burundi

Project number: 92937

Project file: MSGQ with 3 x SMC 5000A

Location: Central Africa / Bujumbura

Record Low Temperature: 0.00 °C

Average High Temperature: 31.00 °C

Record High Temperature: 40.00 °CPart project 1

Ambient temperature:

ro je ct

A fr ic a

M S

G Q

DRAWING

S ys te m

T o ta l:

5.

kW D

C

S T

C

S un po w er

S P

R -3

E

-W H

T -D st rin gs o f 8 p er in ve rt er

S

M C

H V

-1 in ve rt er s

M ou nt ed o n

S ch uc o

M od ul e

T ilt

.5

A zi m ut h

N A

C

TITLE

REV

None

DATE

C L

IE

N

T S

Y S

T E

M D

E S

C R

IP

T

IO

N

P R

O J

E C

T

R ev

B y

D at e C o m m en t

G

LB

-0

2-

In iti al D ra ft

C kd

2011-May-10 SCALE (11"x17")

PV-E01

SHOP DRAWING

Panelboard MDP

?A, 400/230VAC

25kA Interrupt

(Existing)

30A, 3P

400A

Sunny WebBox

Communication hub mounted inside tower Power from Sunny Tower

PV Data Monitor Network

Array

DC

AC

DATA

30'

80'

105'

6- PV wire 4 mm2, #8G bare

¾” RGS, 6#10 THWN-2, #8 EGC

1 ¼” RGS, 4#4 THWN-2, 1#6 G

Shielded 4 conductor RS-485 cable in ¾”C

WIRING (Minimum Requirements)

Conduit & WireDescription ~LengthLabel

B

A

C

PAGE

48 Sunpower

SPR 320E-WHT-D

PV Modules

One array per inverter; Two arrays total;

Each array comprised of 2 strings of eight modules or 16 modules per inverter

Voc =518 , Isc = 6.24A

Location: rooftop Positive Ground

D

C

Inverter breakers 38, 40, 42

TOWER.INVERTER.STRING.MODULE

D

UTLSB-U

1600A bus, CB#1, 400A CB, 65kAIC

UTLSG-U

„CB#11‟

3000A bus, 1000A CB, 65kAIC

UTLSG-E-U

„CB#3‟

3000A bus, 3000A

G

Transformer

15kVΔ :400/230Y

2MVA

Room MQ110

M

P S

-0 2-

S ho p

D ra w in gs R ev ie w

C G

LB

-0

5-

C ha ng e in ve rt er s to

S T

M C

A

KEY

TOWER.INVERTER.STRING.MODULE

Example A.01.02.07 Sunny Tower A, Inverter 01, String 2, Module 7

A.01.1.08

A

B

INV

A.01.1.01

INV

A.02.3.01

INV

A.02.3.08

Sunny Tower A Located on rooftop

A.01 A.03

Exterior AC

Disconnect

Square D HU363RB

100A, 600VAC,

isolated neutral, NEMA 3R

(provided by others)

Sunny Tower “A”

6 x SMC 5000A Inverters (3 used/3 spare)

M

P S

-0 5-

S ho p

D ra w in gs R ev

1) System shall conform to 2008 NEC, state and local Code requirements, electric utility co. requirements and manufacturers' instructions.

2) RMC (RGS) conduit and copper conductors required unless otherwise noted.

3) All conductors shall have THWN-2 (90°C) rating to ensure Code compliance, including #10 conductors.

4) All conductors shall have continuous insulation color unless #4 AWG or larger.

5) DC color coding to be black for ungrounded conductor, white for grounded conductor, and green for grounding conductor.

6) Inverters connected phase to neutral.

7) All connections from wire troughs to PV combiners, PV disconnects or PV inverters shall be made through conduit nipples.

8) Connections to the top of NEMA 3R or NEMA 4/4X troughs and junction boxes shall be made with listed weathertight connectors to maintain the enclosure's rating.

9) All disconnects and other equipment shall be marked and labeled as required by the 2008 NEC and all applicable state and local Codes.

10) The conduit systems shall be laid out, designed, furnished and installed to compensate for thermal expansion and contraction in accordance with 2008 NEC Article 300.7. RMC raintight expansion & contraction fittings shall be provided as directed in the field. RMC conduits to be galvanized and installed in accordance with NEC 344. All fittings shall be raintight on roof.

11) Rooftop conduits shall be installed a minimum of 3 1/2" above the roof surface (measured to bottom of raceway).

12) The Electrical Contractor shall perform insulation resistance testing on all conductors. All readings shall be documented and provided as a report to RESC.

13) Structural review of roof by others.

14) Locks or padlocks shall be installed to secure all equipment unless location is accessible for qualified persons only.

15) At point of penetration from exterior to interior, install raceway fittings at suitable and accessible locations and fill them with sealing compound.

16) All grounding electrode conductors shall be installed in single continuous lengths except where spliced by irreversible connector or exothermic weld.

17) Maximum DC voltage calculated using module temperature coefficient for VOC.

GENERAL NOTES (APPLY TO ALL SHEETS)

A.01 - 03 12A 438V13A 571V 22A 230/400

INVERTER LABELING

DC ImaxDC Iop DC VopInverter DC Vmax AC Iop AC Vop

PV Electrical One-Line

P ro je ct

A fr ic a

M S

G Q

DRAWING

S ys te m

T o ta l:

5.

kW D

C

S T

C

S un po w er

S P

R -3

E

-W H

T -D st rin gs o f 8 p er in ve rt er

S

M C

H V

-1 in ve rt er s

M ou nt ed o n

S ch uc o

M od ul e

T ilt

.5

A zi m ut h

N A

C

TITLE

REV

None

DATE

C L

IE

N

T S

Y S

T E

M D

E S

C R

IP

T

IO

N

P R

O J

E C

T

R ev

B y

D at e C o m m en t

G

LB

-0

2-

In iti al D ra ft

C kd

2011-May-10 SCALE (11"x17")

PV-E01

PAGE

Wiley Electronics ACE Box

Transition box from module USE-2 conductors to THWN-2 insulated conductors One transition box per inverter

– three PV strings per transition box, labeled per drawing

TO PV

MODULES

TO

INVERTER

TRANSITION BOX DETAIL

M

P S

-0 5-

S ho p

D ra w in gs R ev

MSGQ 3 x SMC 5000A inverters Date 5/12/11

Conductor Sizing and Overcurrent Device Ratings = user input needed

Step 1 - Determine Continuous Circuit Voltage

Step 1A SOURCE CIRCUIT 1 Based on IAEI News Article Isc = 6.24 A Sunpower SPR-320E "Conductor Sizing and OverCurrent Device Ratings" Vmp 54.7 V x 8 = 437.60 V Isc = 6.24 A by John Wiles (Jan./Feb. 2011) Vms 69.215 V x 1 x 8 = 553.72 V Imp = 5.86 A Imp = 5.86 A Voc = 64.8 V Step 1 Determine the continuous current in the circuit NEC Isc 6.24 A x 1.56 = 9.73 A Vmp = 54.7 V A. PV DC Circuits

6.24 A x 1.25 = 7.8 A Fuse = 20 A B. AC Inverter Output Circuits OUTPUT CIRCUIT 1 Voltage Temp Coeff -176.6 mV Isc 6.24 A x 2 = 12.48 A Step 2 Calculate the rating of the overcurrent device where required Vmp = 437.60 V Operating Conditions A. Rating determined from Continuous Currents Vms = 553.72 V Record low temperature 0 deg C B. Operating Temperature Affects Rating Imp 5.86 A x 2 = 11.72 A Highest Avg Monthly Temperature 31 deg C NEC Isc 12.48 A x 1.56 = 19.47 A Step 3 Select Conductor Size

12.48 A x 1.25 = 15.60 A A. Ampacity Requirements

Step 1B INVERTER 1 B. 125% Requirement

5000 W / 230 x 1.25 = 27.17 A Low Temperature Voc Correction 5000 W / 230 = 21.74 A String Voc 518.4 VDC Step 4 Terminal Temperature Limits

SMA SMC7000HV-11 Temp coefficient -176.6 mV/C deg Record low 0 Deg C Step 5 Verify that the overcurrent device protects the Temp diff from STC -25 Deg C conductor selected under the conditions of use.

Step 1B ST6 15000 W 230 V = 65.217391 AAC String Calcs

65.217391 A / 3 ph = 21.74 A per ph Voltage increase 35.32 VDC

Voc (temp corrected) 553.72 VDC

21.74 A x 1.25 NEC = 27.17 Max inverter DC input 800 VDC

LABELING

230 AC Operating V

21.74 AC Operating I

69.215 Voc per mod, 2008 NEC temp corrected

553.72 Voc (temp corrected) per string

518.4 uncorrected Voc

553.72 DC Max V

7.8 DC max I

437.60 DC Operating V

MSGQ 3 x SMC 5000A inverters Date 5/11/11

DC Conductor Sizing and Verification of OCP Device AC Conductor Sizing and Verification of OCP Device

THWN-2 Conductor THWN-2 Conductor THWN-2 Conductor T310.16 Table 310.15 (B)(2)(c ) ACME Junction Box to Inverter Inside Sunny Tower Sunny Tower to Solar Backfeed Breaker Distance above roof to bottom of Conduit Temp Adder

Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) Source Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) Initial Selection of Conductor Size Based on Target Voltage Drop (<1%) deg C deg C deg F Inverters connected ph to N 21-25 1.04 0 to 13 mm (1/2") 33 60

112 LF (maximum DC conductor length) Drawings AC run 1 Inverters per phase 26-30 1 Above 13 mm to 90 mm 1/2" to 3 1/2" 22 40

437.60 Vmps 5 105 ft 31-35 0.96 Above 90 mm to 300 mm 3 1/2" to 12" 17 30

5.86 Imp one string 230 VAC 230 VAC 36-40 0.91 Above 300 mm to 900 mm 12" to 36" 14 25

9.73 Isc NEC 27.17 AAC NEC 27.17 AAC NEC 41-45 0.87

7.80 Isc Continuous 21.74 AAC Continuous 21.74 AAC Continuous 46-50 0.82

Voltage drop Vmp * Imp Voltage Drop Vdrop combined 51-55 0.76 10 AWG Conductor Size User selected 8 AWG Conductor Size 4 AWG Conductor Size 56-60 0.71

112.00 DC run in feet 5.00 AC run in feet 105 AC run combiner to POC 61-70 0.58

5.86 Imp of source ckt 21.74 AC Imp 21.74 AC Imp 71-80 0.41

0.37% Vdrop Chosen from Voltage Drop DC worksheet Chap. 9, Table 8 0.07% Voltage drop AC 0.68% 0.61% AC Vdrop combined

Upsized conductor size to match same conductors as used for Sunny Tower conductors

Step 2 Step 2 Step 2

27.2 27.2

Table 310.15(B)(2)(a) - Conduit Fill Correction Factors Use 30 Amp Breaker Use 30 Amp Breaker # of current carrying conductors

4 to 6 80 7 to 9 70 10 to 20 50 21 to 30 45

Step 3A Select Conductor Size (Ampacity) Step 3A Select Conductor Size (Ampacity) Step 3A Select Conductor Size (Ampacity) 31 to 40 40 10 AWG Conductor Size 8 AWG Conductor Size 4 AWG Conductor Size 41 and above 35 40 amps Conductor rating at 90 deg C Table 310.16 55 amps Conductor rating at 90 deg C 95 amps Conductor rating at 90 deg C

31 31 31

22 Table 310.15 (B)(2)(c ) 4

Sunny Tower on roof

53 35

0.76 Table 310.16 0.96 Inside

Tower

0.76

30.40 53 72.20

6 # current carrying conductors in conduit Three strings x 2 (plus, minus) and EG

2 # current carrying of conductors in conduit

L and N and EG 4 # of current carrying conductors in conduit

L1, L2, L3, N and EG

0.8 derate for conduit fill Table 310.15(B)(2)(a) 1 derate for conduit fill 0.8 derate for conduit fill

24.32 amps Conductor Operating Capacity 52.80 amps Conductor Operating Capacity 57.76 amps Conductor Operating Capacity

7.80 amps Continuous Current (Strings in parallel minus one) 21.74 amps Continuous Current 21.74 amps Continuous Current Yes Is Conductor Operating Capacity > Continuous Current Yes Is Conductor Operating Capacity > Continuous Current Yes Is Conductor Operating Capacity > Continuous Current

Step 3B Select Conductor Size (125% Requirement) Step 3B Select Conductor Size (125% Requirement) Step 3B Select Conductor Size (125% Requirement) 10 AWG Conductor Size 8 AWG Conductor Size 4 AWG Conductor Size 40 amps Conductor Rating at 90 Deg C Table 310.16 55 amps Conductor Rating at 90 Deg C 95 amps Conductor Rating at 90 Deg C

9.75 27 27

Yes Yes Yes

Step 3 Final Conductor Selection Step 3 Final Conductor Selection Step 3 Final Conductor Selection 10 AWG Conductor Size (Ampacity Requirement) 8 AWG Conductor Size (Ampacity Requirement) 4 AWG Conductor Size (Ampacity Requirement) 10 AWG Conductor Size (125% Requirement) 8 AWG Conductor Size (125% Requirement) 4 AWG Conductor Size (125% Requirement) 10 AWG Use Larger Conductor Size 8 AWG Use Larger Conductor Size 4 AWG Use Larger Conductor Size

Step 4 Check Terminal Temperature Limits Step 4 Step 4

10 AWG Chosen Conductor Size from Step 3 8 AWG Chosen Conductor Size from Step 3 4 AWG Chosen Conductor Size from Step 3

35 amps Conductor Rating at 75 deg C Table 310.16 50 amps Conductor Rating at 75 deg C 85 amps Conductor Rating at 75 deg C

9.75 27.2 27.2

Yes Yes Yes

Step 5 Check for OCP Device Sizing to protect conductor under actual operating conditions Step 5 Check OCP Device Sizing Step 5 Check OCP Device Sizing A. Normal method for choosing OCP Device A. Normal Method for Choosing OCP Device

No OCP required. 27.2 amps 125% of Continuous Current 27.2 amps 125% of Continuous Current Round up to Breaker Size Round up to Breaker Size

30 amps Chosen Breaker 30 amps Chosen Breaker Conduit Fill Annex C, Table C.8 Need 6 current carrying #10 THWN-2 Max. number of conductors B. Checking OCP Device to protect conductor under actual operating conditions B. Checking OCP Device to protect conductor under actual operating conditions 3/4" RMC (RGS) is good for 10 conductors max. in rigid metal conduct (RMC) Check Chosen Conductor Capacity under actual operating condiitons Check Chosen Conductor Capacity under actual operating condiitons

8 AWG Conductor Size 4 AWG Conductor Size 55 amps Conductor rating at 90 deg C 95 amps Conductor rating at 90 deg C

31 31 4 22

35 53

0.96 0.76

53 72 2 # current carrying of conductors in conduitL1 , N and EG 4 # current carrying of conductors in conduitL1 ,L2, L3 and N and EG 1 derate for conduit fill 0.8 derate for conduit fill

53 amps Conductor Operating Capacity 58 amps Conductor Operating Capacity

60 60

Yes Is Chosen Breaker in "A" smaller than Max possible breaker "B" Yes Is Chosen Breaker in "A" smaller than Max possible breaker in "B" If "NO", have to use a larger conductor size If "NO", have to use a larger conductor size

Conduit Fill Conduit fill Inside Sunny Tower Need 4 #4 THWN-2 and #6 EG No conduit required 1 1/4" RMC (RGS) good for 7 conductors max.

deg C (Estimated Operating Temperature) on roof amps - Maximum possible breaker that could be used based on Conductor Operating Capacity

Ambient avg high temperature (deg C) deg C (Estimated Operating Temperature) on roof amps - Maximum possible breaker that could be used based on Conductor Operating Capacity

Temperature Added for operating conditions (deg C) assuming

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

Temperature Added for operating conditions (deg C)

Temperature correction factor amps (temperature adjusted ampacity of selected amps 125% of Continuous Current

Check Terminal Temperature Limits Check Terminal Temperature Limits amps 125% of Continuous Current

Ambient avg high temperature (deg C)

Is conductor rating (@75 deg C) capacity > 125% of Continuous Current

Is current rating (@75 deg C) capacity > 125% of Continuous Current

String fusing not necessary because only two strings in parallel.

Calculate the Rating of the Overcurrent Protection Device, where requiredCalculate the Rating of the Overcurrent Protection Device, where required Calculate the Rating of the Overcurrent Protection Device, where required

125% of continuous current

Temperature Correction Factors

THWN-2, Cu

Ambient avg high temperature (deg C) deg C (Estimated Operating Temperature) on roof

Ambient avg high temperature (deg C) ft from inverter to Sunny Tower

% of values

125% of continuous current

See Step 2

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface amps (temperature adjusted ampacity of selected conductor) deg C (Estimated Operating Temperature) on roof

Temperature correction factor amps 125% of Continuous Current (strings in parallel minus one) Is conductor rating (90 deg C) >125% of continuous current amps 125% of Continuous Current (strings in parallel

Is conductor rating (@75 deg C) capacity > 125% of Continuous Current

Ambient avg high temperature (deg C) amps 125% of Continuous Current

Is conductor rating (90 deg C) >125% of continuous current amps 125% of Continuous Current

Is conductor rating (90 deg C) >125% of continuous current

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface deg C (Estimated Operating Temperature) on roof

Temperature correction factor amps (temperature adjusted ampacity of selected conductor)

Temperature Added for operating conditions (deg C) assuming conduit within 4 inches of roof surface

Temperature correction factor

WHE

and Parking Canopy

Electrical Drawing and Calculations

161.28 kW

PV

Array x 320W SunPower modules x

SMA

SMC

7000HV-‐11

Inverters

P.O. Box 967

54 Holly Hill Road (packages)

Averill Park, NY 12018

USA

Michael P. Stangl, P.E. • Renewable Power Design Group • P.O. Box 967 • 54

Caddell Construction, Cos.

Tel.: +01 518 674-3684

Fax: +01 518 514-1212

E-Mail: MStangl@rpdg.us.com

WHE Building

92937

WHE with 21 x SMC

Location: Central Africa / Bujumbura

Grid voltage: 3~400 V

Project name:

Project number:

Project file:

System overview Part project 1

504 x Sunpower E19/320 (US) (PV Arrays for Entire Building)

Azimuth angle: -135 °, Angle of inclination: 7 °, Mounting type: Roof, PV Peak power: 161.28 kW

Inverters:

21 x SMC 7000HV-11 (Inverter efficiency: 95.2 %)

Technical data

Total number of PV modules:

PV Peak power: 161.28 kWp

Number of inverters: 21

Nominal AC power: 139.65 kW

Annual energy yield (approx.)*:

239.84 MWh

Energy usability factor: 100.0 %

Performance ratio (approx.

83.5 %

Spec. energy yield (approx.

1487 kWh/kWp

Line losses (in % of PV energy):

Unbalanced load: 0.00 VA

Notes:

Important: The yield values displayed are estimates. They are determined mathematically. SMA Solar Technology AG accepts no responsibility for the real yield value which can deviate from the yield values displayed here. Reasons for deviations are various outside conditions, such as soiling of the PV Modules or fluctuations in the efficiency of the PV modules.

Inverter: 21 x SMC 7000HV-11

PV-module:

A: (PV Arrays for Entire Building)

Sunpower

E19/320 (US)

Azimuth angle: -135 °, Angle of inclination: 7 °Mounting type: Roof

Technical data

Number of strings:

Number of PV modules (input):

Peak power (input):

Min. PV voltage:

Typical PV voltage:

Min. DC voltage (Grid voltage 230 V):

Max. PV voltage:

Max. DC voltage (PV):

Max. current of PV array:

Max. DC current:

PV Peak power:

Total number of PV modules:

Number of inverters:

Max. DC power (cos φ = 1):

Max. AC active power (cos φ = 1):

Grid voltage:

Nominal power ratio:

Displacement power factor cos φ:

161.28 kWp

7.50 kW

7.00 kW

230 V

98.0 %

PV/Inverter compatible

PV array and type of inverter are compatible. The nominal power ratio (max. DC power of the inverter divided by the peak power) is within the recommended range (90% - 110%).

There are probably specific grounding recommendations stated by the manufacturer for the selected PV modules.

Consult the manufacturer regarding current grounding recommendations. Please note that the grounding of the PV array takes place via a separate grounding set in the inverter.

PV-array:

Input A:

PV Arrays for Entire Building

7.68 kWp

374 V

395 V

335 V

554 V

600 V

17.6 A

23.0 A

Project name: WHE Building

Project number: 92937

Project file: WHE with 21 x SMC 7000HV11

Location: Central Africa / Bujumbura

Record Low Temperature: 0.00 °C

Average High Temperature: 31.00 °C

Record High Temperature: 40.00 °CPart project 1

Ambient temperature:

ro je ct

A fr ic a

W H

E

DRAWING

S ys te m

T o ta l:

.0 kW D

C

S T

C

S un po w er S

P R

-3

E -W

H T

-D

T O

W E

R S st rin gs o f 8 p er in ve rt er

S

M C

H V

-1 in ve rt er s

D

IS

C R

E T

E st rin gs o f 8 p er in ve rt er

S

M C

A in ve rt er s

M ou nt ed o n

S ch uc o

M od ul e

T ilt

.5

B

TITLE

REV

None

DATE

C L

IE

N

T S

Y S

T E

M D

E S

C R

IP

T

IO

N

P R

O J

E C

T

R ev

B y

D at e C o m m en t

G

LB

-0

2-

In iti al D ra ft

C kd

2011-May-07 SCALE (11"x17")

PV-E01

SHOP DRAWING

Switchboard WHU SEC2

?A, 400/230VAC

42kA Interrupt

(Existing)

80A, 3P

800A fusing

Sunny WebBox

Communication hub located inside Tower

A Internal power supply

PV Data Monitor Network

Array

DC

AC

DATA

AC

AC

25'

251'

48'

48'

15'

6-PV Wire, 4mm2, #8G bare

¾” RGS, 6#10 THWN-2, #8 EGC

2” RGS, 4#1 THWN-2, #6 G

Shielded 4 conductor RS-485 cable in ¾”C

1 ¼” RGS, 4#4 THWN-2, #6 G

1" RGS, 6#8 THWN-2, #6 G

WIRING (Minimum Requirements)

Conduit & WireDescription ~LengthLabel

B

A

C

PAGE

144 Sunpower

SPR 320E-WHT-D

PV Modules

One array per inverter; Six arrays total;

Each array comprised of three strings of eight modules or 24 modules per inverter

Voc = 518V, Isc = 6.24A

Location: rooftop…