4-Scedule II -Bucks Brownfield Helioscopes Combined.pdf
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- Attached to
- Solar Procurement and Installation for projects identified by the Sustainable Energy Partnership (“SEP”)
- Solicitation number
- 6599
- Issued by
- Montgomery County, Pennsylvania
About this file
This is an Annual Production Report for solar photovoltaic systems at the Lower Bucks Brownfield site in Levittown, Pennsylvania, prepared by the Pennsylvania Solar Center for the Sustainable Energy Partnership comprising Bucks County, Chester County, Delaware County, and Montgomery County. The document presents detailed engineering analysis and performance projections for two distinct solar system designs proposed for the same project location at 7311 New Falls Rd, Levittown, PA 19055. The first design, the Enphase configuration, features 787 QCells Q.PEAK DUO XL-G11S 585W modules with a 460.40 kW DC nameplate capacity and 336.05 kW AC inverter capacity, utilizing 787 individual Enphase IQ9N-3P-A-US-277 microinverters. The second design, the SolarEdge configuration, uses the same 787 modules with identical DC capacity but incorporates four SolarEdge SE100KUS inverters with 400.00 kW combined AC capacity and 395 SolarEdge S1201 optimizers for module-level power optimization. Both systems utilize fixed-tilt racking at landscape orientation with identical field specifications and identical irradiance metrics.
The Enphase system projects annual energy production of 609.6 MWh with a performance ratio of 84.5%, while the SolarEdge system projects 601.7 MWh with a performance ratio of 83.4%, reflecting the SolarEdge system's higher AC system losses of 4.0% compared to the Enphase system's 0.0% AC system losses. Both designs were analyzed using NREL TMY weather data for the project coordinates (40.15, -74.85) and employ identical bifacial modules with rear irradiance calculations, soiling assumptions, and temperature derating models. The analysis was conducted using Aurora Solar simulation software and accounts for multiple system losses including front shading (2.2%), reflection (3.4%), soiling (2.3%), temperature effects (1.8%), and inverter conversion losses (2.9% for Enphase and 1.5% for SolarEdge). No pricing, contracting terms, timelines, or procurement details are included in this technical performance document.
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Lower Bucks Brown�eld Enphase Bucks County, 7311 New Falls Rd, Levittown, PA 19055
Project Name Bucks County
Project
Address
7311 New Falls Rd, Levittown, PA
19055
Prepared By Leo Kowalski leo@pasolarcenter.org
Report
Design Lower Bucks Brownfield Enphase
Module DC
Nameplate
460.40 kW
Inverter AC
Nameplate
336.05 kW
Load Ratio: 1.37
Annual Production 609.6 MWh
Performance Ratio 84.5% kWh/kWp 1,324.2
Weather Dataset TMY, 10km grid (40.15,-74.85), NREL (prospector)
Simulator Version 511b9b6d49-3223cb372b-
73802f8b4b-84e61a7f42
System Metrics Project Location
Monthly Production kW h
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
25k
50k
75k
100k
Sources of System Loss
Front ShadingFront Shading: 2.2%: 2.2%Front Shading: 2.2%
ReflectionReflection: 3.4%: 3.4%Reflection: 3.4%
SoilingSoiling: 2.3%: 2.3%Soiling: 2.3%
IrradianceIrradiance: 0.8%: 0.8%Irradiance: 0.8%TemperatureTemperature: 1.8%: 1.8%Temperature: 1.8%
ElectricalElectrical MismatchMismatch: 0.1%: 0.1% Electrical Mismatch: 0.1%
WiringWiring: 1.3%: 1.3%Wiring: 1.3%
ClippingClipping: 2.1%: 2.1%Clipping: 2.1%
InvertersInverters: 2.9%: 2.9%Inverters: 2.9%
AC SystemAC System: 0.0%: 0.0%AC System: 0.0%
BifacialityBifaciality: 0.1%: 0.1%Bifaciality: 0.1%
Rear MismatchRear Mismatch: 0.0%: 0.0%Rear Mismatch: 0.0%
Annual Production Report produced by Leo Kowalski
© 2026 Aurora Solar 1 / 4 April 20, 2026
Description Output
Delta
Front
Irradiance
(kWh/m )
Annual Global Horizontal
Irradiance 1,464.5
POA Irradiance 1,566.3 6.9%
Shaded Irradiance 1,531.8 -2.2%
Irradiance after Reflection 1,479.7 -3.4%
Irradiance after Soiling 1,445.0 -2.3%
Total Front Collector Irradiance 1,445.0 0.0%
Rear Irradiance
(kWh/m )
Supported only for fixed tilt racking
Surface
Irradiance in
Collector
Plane
Global Incident
Irradiance on
Surface
386.0 -
Surface Reflected
Irradiance after
Albedo
77.2 -80.0%
Conversion from
Surface Area to
Collector Area
110.0
Surface Irradiance in Collector Plane
5.5 -95.0%
Unshaded
Irradiance on
Rear Side
Surface Irradiance in Collector Plane 5.5
Sky Diffuse 1.6
Beam Effective 0.1
Total Unshaded
Irradiance on Rear
Side
7.1
Shaded Irradiance on Rear Side 6.7 -5.0%
Total Rear Collector Irradiance 6.7
Effective Rear Collector
Irradiance
4.7 -30.0%
Total Collector Irradiance 1,449.7
Energy
(kWh)
Nameplate 667,304.7
Output at Irradiance Levels 662,275.3 -0.8%
Output at Cell Temperature Derate 650,361.1 -1.8%
Output after Electrical Mismatch 649,924.7 -0.1%
Output after Rear Mismatch 649,714.2 0.0%
Optimal DC Output 641,704.5 -1.3%
Constrained DC Output 628,199.4 -2.1%
Inverter Output 609,823.2 -2.9%
Energy to Grid 609,639.5 0.0%
Temperature Metrics
Avg. Operating Ambient Temp 14.0 °C
Avg. Operating Cell Temp 21.6 °C
Simulation Metrics
Operating Hours 4686
Solved Hours 4686
Annual Production
Description Condition Set 1
Weather Dataset TMY, 10km grid (40.15,-74.85), NREL (prospector)
Solar Angle
Location Meteo Lat/Lng
Transposition
Model Perez Model
Temperature Model Sandia Model
Temperature Model
Parameters
Rack Type a b Temperature Delta
Fixed Tilt -3.56 -0.075 3°C
Flush Mount -2.81 -0.0455 0°C
East-West -3.56 -0.075 3°C
Carport -3.56 -0.075 3°C
Soiling (%) J F M A M J J A S O N D
13 9 4 1 1 1 0 0 1 1 1 7
Albedo J F M A M J J A S O N D
0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
Rear Mismatch
Loss 10% Rear Shading Factor 5%
Module
Transparency 0%
Irradiation Variance 5%
Cell Temperature
Spread 4° C
Module Binning
Range -2.5% to 2.5%
AC System Derate 0.50%
Module &
Component
Characterizations
Type Component Characterization Bifacial
Module
Q.PEAK DUO XL-G11S 585W
(QCells)
Spec Sheet Characterization, PAN
True
Inverter
IQ9N-3P-A-US-277 (2026)
(Enphase) Default Characterization N/A
Condition Set
Annual Production Report produced by Leo Kowalski
© 2026 Aurora Solar 2 / 4 April 20, 2026 https://app.helioscope.com/library/meteo/5580
Component Name Count
Inverters
IQ9N-3P-A-US-277 (2026)
(Enphase)
787 (336.05 kW)
AC Panels 11 input AC Panel 5
AC Panels 12 input AC Panel 61
AC Home
Runs 10 AWG (Copper)
(234,451.1 ft)
AC Home
Runs 500 MCM (Copper)
66 (84,258.3 ft)
Home Runs 12 AWG (Copper) 1,574
(26,437.3 ft)
Combiners 1 input Combiner 1,574
Strings 10 AWG (Copper) 787 (17,449.5 ft)
Module QCells, Q.PEAK DUO XL-
G11S 585W (585W)
787 (460.40 kW)
Components
Description Combiner Poles String Size Stringing Strategy
Wiring Zone 12 1-1 Along Racking
Wiring Zones
Description Racking Orientation Tilt Azimuth Intrarow
Spacing
Frame
Size Frames Modules Power
Field
Segment 1
Fixed
Tilt
Landscape
(Horizontal)
Module:
10°
Module:
211.83232°
1.6 ft 1x1 787 787
460.40 kW
Field Segments
© 2026 Aurora Solar 3 / 4 April 20, 2026
Detailed Layout2
© 2026 Aurora Solar 4 / 4 April 20, 2026
Lower Bucks Brown�eld String Bucks County, 7311 New Falls Rd, Levittown, PA
19055
Project Name Bucks County
Project
Address
7311 New Falls Rd, Levittown, PA
19055
Prepared By Leo Kowalski leo@pasolarcenter.org
Report
Design Lower Bucks Brownfield String
Module DC
Nameplate
460.40 kW
Inverter AC
Nameplate
400.00 kW
Load Ratio: 1.15
Annual Production 601.7 MWh
Performance Ratio 83.4% kWh/kWp 1,307.0
Weather Dataset TMY, 10km grid (40.15,-74.85), NREL (prospector)
Simulator Version 511b9b6d49-3223cb372b-
73802f8b4b-84e61a7f42
System Metrics Project Location
Monthly Production kW h
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
25k
50k
75k
100k
Sources of System Loss
Front ShadingFront Shading: 2.2%: 2.2%Front Shading: 2.2%
ReflectionReflection: 3.4%: 3.4%Reflection: 3.4%
SoilingSoiling: 2.3%: 2.3%Soiling: 2.3%
IrradianceIrradiance: 0.8%: 0.8%Irradiance: 0.8%TemperatureTemperature: 1.8%: 1.8%Temperature: 1.8%
ElectricalElectrical MismatchMismatch: 0.3%: 0.3% Electrical Mismatch: 0.3%
OptimizersOptimizers: 1.3%: 1.3%Optimizers: 1.3%
WiringWiring: 0.5%: 0.5%Wiring: 0.5%
InvertersInverters: 1.5%: 1.5%Inverters: 1.5%
AC SystemAC System: 4.0%: 4.0%AC System: 4.0%
© 2026 Aurora Solar 1 / 4 April 20, 2026
Description Output
Delta
Front
Irradiance
(kWh/m )
Annual Global Horizontal
Irradiance 1,464.5
POA Irradiance 1,566.3 6.9%
Shaded Irradiance 1,532.3 -2.2%
Irradiance after Reflection 1,480.1 -3.4%
Irradiance after Soiling 1,445.4 -2.3%
Total Front Collector Irradiance 1,445.3 0.0%
Rear Irradiance
(kWh/m )
Supported only for fixed tilt racking
Surface
Irradiance in
Collector
Plane
Global Incident
Irradiance on
Surface
386.0 -
Surface Reflected
Irradiance after
Albedo
77.2 -80.0%
Conversion from
Surface Area to
Collector Area
110.0
Surface Irradiance in Collector Plane
5.5 -95.0%
Unshaded
Irradiance on
Rear Side
Surface Irradiance in Collector Plane 5.5
Sky Diffuse 1.6
Beam Effective 0.1
Total Unshaded
Irradiance on Rear
Side
7.1
Shaded Irradiance on Rear Side 6.7 -5.0%
Total Rear Collector Irradiance 6.7
Effective Rear Collector
Irradiance
4.7 -30.0%
Total Collector Irradiance 1,450.0
Energy
(kWh)
Nameplate 667,457.3
Output at Irradiance Levels 662,428.2 -0.8%
Output at Cell Temperature Derate 650,508.8 -1.8%
Output after Electrical Mismatch 648,546.3 -0.3%
Output after Rear Mismatch 648,336.6 0.0%
Optimizer Output 640,415.0 -1.3%
Optimal DC Output 637,357.6 -0.5%
Constrained DC Output 636,459.2 -0.1%
Inverter Output 626,907.1 -1.5%
Energy to Grid 601,731.1 -4.0%
Temperature Metrics
Avg. Operating Ambient Temp 14.0 °C
Avg. Operating Cell Temp 21.6 °C
Simulation Metrics
Operating Hours 4686
Solved Hours 4686
Annual Production
Description Condition Set 1
Weather Dataset TMY, 10km grid (40.15,-74.85), NREL (prospector)
Solar Angle
Location Meteo Lat/Lng
Transposition
Model Perez Model
Temperature
Model Sandia Model
Temperature
Model Parameters
Rack Type a b Temperature Delta
Fixed Tilt -3.56 -0.075 3°C
Flush Mount -2.81 -0.0455 0°C
East-West -3.56 -0.075 3°C
Carport -3.56 -0.075 3°C
Soiling (%) J F M A M J J A S O N D
13 9 4 1 1 1 0 0 1 1 1 7
Albedo J F M A M J J A S O N D
0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
Rear Mismatch
Loss 10% Rear Shading Factor 5%
Module
Transparency 0%
Irradiation
Variance 5%
Cell Temperature
Spread 4° C
Module Binning
Range -2.5% to 2.5%
AC System Derate 0.50%
Module &
Component
Characterizations
Type Component Characterization Bifacial
Module
Q.PEAK DUO XL-G11S
585W (QCells)
Spec Sheet
Characterization, PAN True
Inverter SE100KUS (SolarEdge) Spec Sheet N/A
Buck Boost
Optimizer S1201 (SolarEdge) Mfg Spec Sheet N/A
Condition Set
Annual Production Report produced by Leo Kowalski
© 2026 Aurora Solar 2 / 4 April 20, 2026 https://app.helioscope.com/library/meteo/5580
Component Name Count
Inverters SE100KUS (SolarEdge) 4 (400.00 kW)
AC Panels 4 input AC Panel 1
AC Home
Runs 10 AWG (Copper)
4 (1,468.4 ft)
AC Home
Runs 500 MCM (Copper)
1 (1,482.9 ft)
Strings 10 AWG (Copper) 28 (2,420.2 ft)
Optimizers S1201 (SolarEdge) 395 (474.00 kW)
Module QCells, Q.PEAK DUO XL-
G11S 585W (585W)
787 (460.40 kW)
Components
Description Combiner Poles String Size Stringing Strategy
Wiring Zone - 13-29 Along Racking
Wiring Zones
Description Racking Orientation Tilt Azimuth Intrarow
Spacing
Frame
Size Frames Modules Power
Field
Segment 1
Fixed
Tilt
Landscape
(Horizontal)
Module:
10°
Module:
211.83232°
1.6 ft 1x1 787 787
460.40 kW
Field Segments
© 2026 Aurora Solar 3 / 4 April 20, 2026
Detailed Layout2
© 2026 Aurora Solar 4 / 4 April 20, 2026
File details come from the government source that posted it. Updated .