Use this free calculator to plan an inverter va range from watts, surge, power factor and margin. Change the load, starting surge, losses and battery limits to match your equipment.
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Motors and compressors can need extra power when they start.
Battery age, temperature and a high discharge rate can reduce delivered energy.
Use this as a planning range. Confirm continuous rating, peak rating and battery compatibility with the manufacturer and a qualified installer.
The recommended VA covers adjusted peak load, power factor and the chosen design margin; it does not determine battery runtime.
Compare the result with both continuous and surge ratings in the manufacturer's datasheet and confirm supported battery-bank voltage.
Choosing an inverter from battery Ah alone mixes an energy-capacity measure with a power-capacity decision.
Required VA = adjusted peak watts ÷ power factor × (1 + safety margin)
Compare the result with both continuous and surge ratings in the manufacturer's datasheet and confirm supported battery-bank voltage.
Choosing an inverter from battery Ah alone mixes an energy-capacity measure with a power-capacity decision.
Use this as a planning range. Confirm continuous rating, peak rating and battery compatibility with the manufacturer and a qualified installer.