Solar panel sizing calculator

Estimate panel wattage needed to replace your daily electricity use. Peak sun hours are an input, not the number of daylight hours.

Daily electricity consumption (Wh/day)Average peak sun hours (hours/day)Real-world solar system efficiency (%)Extra sizing buffer (%)

Suggested planning size: 450 W of panels

Calculated requirement: 417 W, rounded up to the next 50 W.

Cloud, shading, panel angle and winter conditions can reduce output substantially. A battery, compatible charge controller and suitable charging sources are still needed. Use local seasonal solar data for serious planning.

Planning estimates only. Real-world consumption varies with temperature, usage, equipment specifications and system losses. Consult a qualified installer for electrical design, wiring and protection.