Solar Panel Array Sizer is a verified engineering & build calculation tool on Calcify. Size a rooftop solar PV system (kWp capacity, number of 550Wp panels, and roof area) from monthly kWh usage. All calculations execute locally in your browser with multi-currency support, visual breakdowns, and white-label client exports.
Uses 7 × 550Wp panels | Shadow-Free Roof Needed: ~327 Sq.Ft.
System_kWp = (Monthly_kWh / 30) / Generation_per_kWp; Panels = Ceiling((System_kWp × 1000) / Panel_Wp)
Example Inputs: Average Monthly Electricity Consumption (kWh / Units): 450 kWh · Peak Sun Hours / Daily Generation per kWp: 4.2 kWh/kWp · Single Solar Panel Rating (Watts Peak): 550 Wp
Example Output: Recommended Solar PV System Size: 3.85 kWp (7 Panels) (Uses 7 × 550Wp panels | Shadow-Free Roof Needed: ~327 Sq.Ft.)
The Solar Panel Array Sizer on Calcify applies the verified mathematical formula: System_kWp = (Monthly_kWh / 30) / Generation_per_kWp; Panels = Ceiling((System_kWp × 1000) / Panel_Wp). Every input is validated in real time with multi-currency formatting to ensure zero rounding or division errors.
1 kWp of rooftop solar in India/tropics generates ~4.0 to 4.5 kWh per day (~120–135 units/month) and requires ~80–100 sq.ft. of shadow-free roof area.
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