TOOL · TRANSPARENT ESTIMATES
Solar energy and battery calculator
Enter your devices and adjust the assumptions. Get a rough estimate of daily use, battery capacity and solar panel wattage.
01 / YOUR DEVICES
What will you power?
Starting values are an example; replace them with your devices. For cycling loads such as fridges, measure a full day of use.
02 / ASSUMPTIONS
Adjust the assumptions
DAILY USE—Wh/day
ROUGH NOMINAL BATTERY—Wh
ROUGH PANEL SIZE—Wp
Formulas: daily Wh = Σ(W × hours × quantity). Nominal battery = daily Wh × days ÷ (usable fraction × conversion efficiency). Panel = daily Wh ÷ (peak sun hours × solar performance factor). This omits startup surges, weather and electrical limits; verify the complete system against technical specifications and seek professional help when needed.