Engineering Calculators

Free, accurate tools to size your solar and backup power systems without the guesswork.

Sizing

Inverter Size Calculator

Calculate the exact VA rating and inverter size you need based on your total load and power factor.

Open Calculator → Energy

Appliance Wattage Calculator

Pick your appliances to calculate your total load (Watts) and your daily energy use (kWh).

Open Calculator → Battery

Battery Backup Time Calculator

Find out exactly how many hours your battery will last under your specific load.

Open Calculator →