Inverter Sizing Calculator — Free Online Calculator
Calculate the inverter wattage needed for your loads. Accounts for surge requirements and continuous power.
How to Use This Calculator
Enter your total continuous load and the largest motor/compressor wattage for surge calculation.
The Formula Explained
Continuous rating = Total load × 1.25 safety factor. Surge rating = Continuous load + (Largest motor × 3 for startup surge). Select an inverter that meets both requirements.