Solar System Size Calculator
Calculate KW system size from electricity usage and sun hours.
Inputs
kWh
hrs/day
%
W
Results
System Size
6.98 kW
Number of Panels
18
Annual Production10,950 kWh
Daily Production30 kWh
How to Use This Calculator
- Enter your average monthly electricity consumption in kWh.
- Set your local peak sun hours per day (use NREL PVWatts for your location).
- Input the system efficiency or derate factor (typically 80–85%).
- Review the recommended system size in kW DC.
- Adjust the system size based on available roof space and local net metering policy.
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