Solar Panel Output Estimator

Estimate the annual electricity a rooftop solar (photovoltaic) system will generate from its size, your local peak-sun-hours, and a performance ratio covering inverter, soiling, wiring and temperature losses. Also shows the capacity factor, the avoided grid CO₂ emissions, and rough everyday equivalences. Pick a city preset for an indicative peak-sun-hours figure or enter your own. Pure arithmetic — a planning sanity check, not a substitute for a site survey. Everything runs locally in your browser.