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Figure of 52 photovoltaic panels on the roof

Estimate how many solar panels fit your roof and the total system capacity (kW) based on roof area and panel specifications. It calculates the maximum number of panels that fit on the available roof surface, taking into account important factors such as orientation, inclination. . This solar panel output calculator helps you determine exactly how many watts and kilowatt-hours your solar panel system will generate daily, monthly, and annually based on panel specifications, quantity, peak sun hours, and system losses. . In a perfect world, the average roof in the U. can generate around 21,840 kilowatt-hours (kWh) of solar electricity annually—that's more than most homes need. But also, the world isn't perfect. Realistically, your roof's solar generation potential will be less than that. Read on to learn more about it!.