Placement: After temperature coefficient explanation • Click a state to see PERC vs TOPCon at peak roof temps
System Size
1,000 kW (1.0 MW)
Assumes 600 W modules by default (editable below).
Peak Hours / Season
100 hours
Peak Rate ($/kWh)
$0.28
Module & Coefficients
Rated Power
W
PERC γPmax
per °C
TOPCon γPmax
per °C
Avg Peak Roof Temperature
65–70°C (deep red)
60–65°C (orange)
55–60°C (yellow)
50–55°C (light yellow)
Selected Region
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Peak Roof Temperature
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Power Loss at Peak (per module)
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Summer Afternoon Advantage (Your Inputs)
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California users: Your NEM 3.0 rates make this temperature advantage worth an extra ~$3,200/year.
Texas ERCOT users: Summer peak pricing means this difference pays for itself faster.
Phoenix, AZ — Story Example
Peak Roof Temperature: 68°C (154°F)
ΔT from STC (25°C): 43°C
Power Loss at Peak:
- PERC (600W): -14.6% = 512W
- TOPCon (600W): -12.5% = 525W
- TOPCon Advantage: +13W per panel
For 1MW system (1,660 panels):
Extra Peak Power: 21.6 kW
Value at peak demand rates ($0.28/kWh): +$1,814 per 100 peak hours
Note: Your live calculator above uses your inputs and temperature coefficients to compute real‑time values.
Colors indicate illustrative state‑level averages. Local roofs (urban vs. coastal, roof color, airflow) can vary by 5–10°C. Use this as a decision aid; confirm with site measurements for final design.