Solar & Battery Calculators

Size solar arrays, batteries, inverters and charge controllers.

kW · panelsSolar Panel CalculatorSystem kW and panel count from your electric bill.hoursBattery Runtime CalculatorHours a battery can power a load, with DoD and inverter loss.Ah · Wh · mAhAh to Wh CalculatorAh, Wh and mAh conversions with airline limits.WInverter Size CalculatorInverter watts, surge, DC amps and fuse size.A · VMPPT Charge Controller CalculatorController amps and max PV voltage with cold-weather Voc.years · $Solar Payback CalculatorBreak-even years and 25-year savings.hoursBattery Charge Time CalculatorHours to charge from any state of charge.degreesSolar Panel Tilt Angle CalculatorBest year-round and seasonal panel angles.S × PBattery Bank Series & Parallel CalculatorHow many batteries and how to wire them.