Free Solar Calculators That Actually Work
Get instant, accurate answers on panel tilt angle, system sizing, voltage, wire gauge, and installation cost. No signup, no email — just numbers.
Most popular calculators
- Solar Panel Tilt CalculatorFree solar panel tilt calculator. Get the optimal angle for year-round, summer, or winter solar production based on your latitude.
- Solar Panel Charge Time CalculatorFree solar panel charge time calculator. Find out how many sun hours or days your solar array needs to recharge your battery from any depth of discharge.
- Solar Panel Wire Size CalculatorFree solar panel wire size calculator. Enter voltage, current, and run length to get the smallest AWG that stays under your max voltage drop.
- Solar Voltage Drop CalculatorFree solar voltage drop calculator. Enter system voltage, current, wire length, and AWG to see drop in volts and percentage. NEC compliant.
- Solar Panel Orientation CalculatorFree solar panel orientation calculator. Enter your latitude, roof azimuth and tilt — see how much annual production you'll get versus the optimal south-facing setup.