Commercial Solar System Design Calculator

Array size from commercial electricity consumption.

Annual electricity usage (kWh)

Peak sun hours (PSH)

System efficiency (derate)

Panel wattage (W)

DC:AC ratio

Installed cost ($/W DC)

Tab to move between fields

Required system size (kW DC)

82.19

Number of panels206

Actual DC capacity (kW)82.4

Inverter capacity (kW AC)68.67

Roof area needed (sq ft)6,209

Est. annual production (kWh)120,304

Solar offset (%)100.3%

Estimated system cost ($)$90,411

How to Use This Calculator

Enter your annual electricity usage in kWh from utility bills.
Set peak sun hours for your location (NREL data; US range 3-7 PSH).
Enter panel wattage, system derate factor, and DC:AC ratio.
Input installed cost per watt DC before incentives.
Review the required system size in kW DC, panel count, roof area needed, and estimated annual production.

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