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Inverter Sizing

Minimum inverter size

Enter peak load & margin

How this calculator works

How to use the Inverter Sizing

The Formula

Inverter W = peak load × (1 + margin ÷ 100). Motors and compressors can draw 2–3× surge at startup—consider a higher margin if you have pumps or fridges.

Practical Example

Inverter datasheets list continuous and peak (surge) watts. Size so peak rating covers motor start surges, not just steady-state load.

About Inverter Sizing

Inverter sizing formula

Inverter W = peak load × (1 + margin ÷ 100). Motors and compressors can draw 2–3× surge at startup—consider a higher margin if you have pumps or fridges.

Continuous vs peak

Inverter datasheets list continuous and peak (surge) watts. Size so peak rating covers motor start surges, not just steady-state load.