Off-Grid & Solar Sizing

Off-Grid & Solar Sizing calculators — each with the formula, a worked example and a reference table. Results are estimates for planning and education; verify all sizing with a licensed electrician and your AHJ.

Off-Grid System Size

Enter your daily energy use in watt-hours, your peak sun hours, system voltage, days of au…

Solar Panel Size

Enter your daily energy in watt-hours, your peak sun hours, a system derate factor and the…

Battery Bank

Enter your daily energy in watt-hours, the days of autonomy you want, your system voltage …

Inverter Size

Enter the total running watts of everything you would power at once and the largest single…

Charge Controller

Enter your solar array watts, the battery voltage and the controller type to find the char…

Watt-Hours

Enter a battery voltage and its amp-hour rating to convert to watt-hours and kilowatt-hour…

Series / Parallel

Enter one cell or battery voltage and amp-hours, plus how many you wire in series and in p…

Panel Output

Enter your solar array size in kilowatts, your peak sun hours and a system derate to estim…