Inverter Peak Load & Surge Calculator

Inrush current & inverter surge

Motors draw brief inrush current—often 3× to 7× running amps when compressors and pumps spin up. An inverter must supply that peak / surge rating for milliseconds to seconds without shutting down, even though its continuous rating covers everyday watts.

Not every motor starts on the same cycle, so we add the largest single surge margin plus a fraction of the next—then match a standard pure-sine tier with ~2× surge capability.

• Use nameplate LRA or manufacturer surge when you have it
• Soft-starters and staggered controls lower effective surge factors