Work out inverter size instantly with clear inputs, formula shown and shareable results.
Inverters are limited both by continuous watts and by surge capability. Continuous rating comes from the running load plus margin, converted to VA by the power factor; surge must cover motor starting, which is typically three to six times a motor's running power for a second or two.
Inverter sizing
VA = running load x (1 + margin) / power factor; DC current = W / efficiency / battery voltage
Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.
The inverter's output stage is current limited, so a reactive load consumes rating without doing useful work. Both figures must be checked.
For motors, transformers, audio equipment and many appliance electronics, yes. Modified square wave causes extra heating and can damage sensitive loads.