884-B710-02_R0 Electrical Load Analysis -DC-137024054.pdf
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- Attached to
- Two (2) 2400 HP Towboats for USACE New Orleans
- Solicitation number
- W912BU-23-B-0026
About this file
This electrical load analysis document provides specifications for two 2400 horsepower towboats being procured by the US Army Corps of Engineers Engineering District Philadelphia. The analysis details the electrical systems required for the towboats, including three DC service panels to provide power for communications equipment, navigation aids, engine controls, lighting and other systems. It analyzes the battery and charging requirements to ensure each panel can provide emergency power for three hours as required. Separate starting batteries are specified for two generators with minimum cold cranking amps and capacity requirements.
The related federal contract opportunity is solicitation number W912BU-23-B-0026 for two 2400 HP towboats from the USACE New Orleans office. The analysis provides the necessary specifications for the electrical systems on the towboats to be procured under this solicitation.
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REV ZONE DRAWN CHKD
GENERAL NOTES
NO.
SIZE REV
A 0
DATE: SCALE: SHEET 1 OF 3
REVISION HISTORY
DESCRIPTION DATE
ELECTRICAL ONE LINE (DC) 884-B720-02 0
DESCRIPTION DWG NO. REV.
REFERENCES
BIENVILLE REPLACEMENT TOWBOAT
DRAWN BY: CHECKED BY:
TEL DPE
DATE: BHGI PROJ #:
Electrical Load Analysis (DC) 8-Jul-22 22705
MARINE DESIGN CENTER
NTS
APP'D BY: PROJECT NO. DWG. NO.
3189 884-B710-02
N/A
We note unity (1.0) load factor is to be used for emergency loads. However it appears that necessary emergency services would last the required time if 1.0 load factor was used.
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Total
# Qty Load (A) LF Load (A) LF Load (A)
1 VHF Radios 2 6.0 0.5 3.0 0.5 3.0
2 Wipers 3 18.0 0.5 9.0 0.5 9.0
3 Swing Meter 1 2.0 0.9 1 .8 0.9 1.8
4 Depth Sounder 1 2.0 0.9 1 .8 0.9 1.8
5 Radars 2 12.0 0.9 10.8 0.9 10.8
6 AIS 1 2.0 0.9 1 .8 0.9 1.8
7 Intercom Master Station 1 4.0 0.5 2.0 0.5 2.0
8 Intercom Strobes & Sirens 2 12.0 0.2 2.4 0.2 2.4
58 33 33
Total
# Qty Load (A) LF Load (A) LF Load (A)
DC ELECTRICAL SUMMARY
DC Service Panels
Towing Emergency
Pilothouse Panel #1 (DC1)
Towing Emergency
Pilothouse Panel #2 (DC2)
9 Fire Detection System 1 2.0 0.5 1 .0 0.5 1.0
10 Bilge Alarm 1 2.0 0.5 1 .0 0.5 1.0
11 Navigation Lights Panel 1 6.0 0.9 5.4 0.9 5.4
12 Main Engine Controls 3 18.0 0.7 12.6 0.7 12.6
13 Steering Mode Selector 1 10.0 0.7 7.0 0.7 7.0
14 Bus Tie Breaker 1 6.0 0.1 0.6 0.1 0.6
Total: 44 28 28
Total
# Qty Load (A) LF Load (A) LF Load (A)
15 Hold Deck Em'cy Lighting 11 4.6 0 0.0 0.9 4.1
16 Main Mach'y Rm Em'cy Lighting 10 4.2 0 0.0 0.9 3.8
17 Main/Upper Deck Interior Em'cy Lighting 12 5.0 0 0.0 0.9 4.5
18 Main Deck Exterior Em'cy Lighting 9 3.8 0 0.0 0.9 3.4
19 Upper Deck Exterior Em'cy Lighting 9 3.8 0 0.0 0.9 3.4
20 Texas/Pilothouse Deck Interior Em'cy Lighting 11 4.6 0 0.0 0.9 4.1
21 Texas/Pilothouse Deck Exterior Em'cy Lighting 8 3.3 0 0.0 0.9 3.0
Total: 29 0 26
DC Service Battery Banks Panel Charger #1 Newmar PT-24-45U: 12A @ 115VAC Input, 45A @ 24VDC Output, 0.98 PF
DC1
Towing Emergency
Emergency Lighting Panel (DC3)
Battery #1A Mastervolt AGM 12/160: Group 4D, 12VDC, 160Ah @ 20hr rate, 1000 CCA Battery #1B Mastervolt AGM 12/160: Group 4D, 12VDC, 160Ah @ 20hr rate, 1000 CCA Charger #2 Newmar PT-24-45U: 12A @ 115VAC Input, 45A @ 24VDC Output, 0.98 PF Battery #2A Mastervolt AGM 12/160: Group 4D, 12VDC, 160Ah @ 20hr rate, 1000 CCA Battery #2B Mastervolt AGM 12/160: Group 4D, 12VDC, 160Ah @ 20hr rate, 1000 CCA Charger #3 Newmar PT-24-45U: 12A @ 115VAC Input, 45A @ 24VDC Output, 0.98 PF Battery #3A Mastervolt AGM 12/160: Group 4D, 12VDC, 160Ah @ 20hr rate, 1000 CCA Battery #3B Mastervolt AGM 12/160: Group 4D, 12VDC, 160Ah @ 20hr rate, 1000 CCA
DC3
24V / 160Ah
DC1
24V / 160Ah
DC2
24V / 160Ah
- Battery banks 1-3 each contain (2X) 12V batteries connected in series to produce 24V.
- Chargers act as constant power supplies during normal operation. Charger rated output must exceed demand during the Towing condition for each panel.
- Batteries must provide 3 hours of operation in the Emergency condition per 46 CFR 143.555 (b)(9).
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Using Peukert's law to estimate effective capacity at constant emergency rate of discharge:
It = C*[C/(I*H)]^(k-1), where:
C = rated capacity at nominal discharge time H (Ah) C = 160 H = nominal discharge time (h) H = 20 k = Peukert constant (Assumed 1.15 for AGM Battery) k = 1.15 I = actual discharge current (A) (Panel DC1) I = 32.6 t = actual discharge time (h) (Panel DC2) I = 27.6 It = I * t = effective capacity at discharge current I (Ah) (Panel DC3) I = 26.3
Panel DC1 PASS
It = 130 Ah, effective capacity Charger Supply (A) = 45 t = 4.0 hours of emergency operation Towing Demand (A) = 33
Panel DC2 PASS
It = 133 Ah, effective capacity Charger Supply (A) = 45 t = 4.8 hours of emergency operation Towing Demand (A) = 28
Panel DC3 PASS
It = 134 Ah, effective capacity Charger Supply (A) = 45 t = 5.1 hours of emergency operation Towing Demand (A) = 0
Electric Start Systems
*Minimum starting battery capacity and cold cranking amps from manufacturer data sheet
Generator Starting Batteries Generator Charger #1 Newmar PT-24-45U: 12A @ 115VAC Input, 45A @ 24VDC Output, 0.98 PF Battery #1A Mastervolt AGM 12/270: Group Super 8D, 12VDC, 270Ah @ 20hr rate, 1600 CCA Battery #1B Mastervolt AGM 12/270: Group Super 8D, 12VDC, 270Ah @ 20hr rate, 1600 CCA Charger #2 Newmar PT-24-45U: 12A @ 115VAC Input, 45A @ 24VDC Output, 0.98 PF Battery #2A Mastervolt AGM 12/270: Group Super 8D, 12VDC, 270Ah @ 20hr rate, 1600 CCA Battery #2B Mastervolt AGM 12/270: Group Super 8D, 12VDC, 270Ah @ 20hr rate, 1600 CCA
1x 24V battery charger and 2x 12V battery are dedicated for each generator for starting.
Generator #1 PASS
Battery Cold Cranking Amps (CCA) = 1600 Battery Capacity (Ah) = 270 Minimum Required CCA = 750 Minimum Required Capacity (Ah) = 255
Generator #2 PASS
Battery Cold Cranking Amps (CCA) = 1600 Battery Capacity (Ah) = 270 Minimum Required CCA = 750 Minimum Required Capacity (Ah) = 255
Batteries meet the generator manufacturer minimum specified capacity (Ah) and CCA.
#1
#2
Generator ID Northern Lights M200C13 Northern Lights M200C13 750
255 750
Min Start Battery
Capacity (Ah)*
Min Start Battery
24V CCA*
Generator Starting Battery Demand
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