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Tools
Solar Calculators
Free, accurate, no signup. Powered by PVGIS, NREL, EIA, and standard engineering formulas.
- 9
- calculators
- PVGIS · NREL · EIA · Eurostat
- data sources
🌞
Solar Potential
Annual PV output for any GPS coordinate
PVGIS · NREL
💰
Payback Period
ROI, NPV, breakeven year for a solar investment
EU + US tariffs
🔋
Power Station Sizing
Required Wh capacity from your appliance list
Pure math
🏝
Battery Autonomy
Days of off-grid autonomy from capacity vs daily load
Pure math
⚡
Inverter Sizing
Required inverter wattage with surge headroom
Pure math
🎛
Charge Controller Sizing
MPPT/PWM controller amps from array and battery
Pure math
🔌
Wire Gauge
Minimum AWG / mm² for current, distance, voltage drop
AWG resistance table
🚙
EV from Solar
How much of your EV charging your solar covers
Pure math
📐
Tilt & Azimuth
Optimal panel angle for any latitude
PVGIS optimum