Inverter Sizing Calculator
Determine recommended inverter continuous and surge ratings.
Inverter Sizing Calculator estimates the continuous and surge ratings needed to convert battery DC power into usable AC power for solar, RV, marine, cabin, or backup systems. Continuous load is the steady power required by appliances running at the same time, while surge load is the short startup demand from motors, compressors, pumps, and power supplies. Watts measure real power, VA measures apparent power, and power factor describes how much of the apparent power becomes useful work. Headroom is extra capacity added so the inverter is not operating at its limit. The tool helps avoid undersized inverters that trip under startup loads and oversized inverters that waste budget and idle power. Final sizing should still be checked against equipment manuals, waveform requirements, derating, wiring limits, and local electrical rules.