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ComfortCalc
Your daily energy usage, divided by how much a panel actually produces given your location's sun exposure.
'Peak sun hours' means the equivalent hours of maximum solar intensity, not total daylight — a location might have 12 hours of daylight but only 5 peak sun hours, since morning and evening sun is much weaker than midday sun.
Real solar system design also accounts for panel efficiency losses, inverter efficiency, shading, roof orientation, and seasonal variation — a solar installer's site assessment will refine this baseline estimate significantly.
Panels needed
15
Peak sun hours vary by location and season — check a solar irradiance map for your area rather than assuming a national average.
What you entered
Daily usage in watt-hours
30 × 1000= 30000 WhRequired system wattage
30000 ÷ 5 peak sun hours= 6000 WNumber of 400W panels
⌈6000 ÷ 400⌉= 15 panels (6000 W system)Result
Panels needed: 15
Covering 30 kWh/day of usage at 5 peak sun hours needs about 15 panels (a 6000 W system).