calculators
Inverter Size Calculator
Estimate inverter size based on total load and a planning margin. Includes a note about motor startup requirements.
Frequently Asked Questions
What planning margin is used?
A 25% default planning margin is used when no value is entered. Adjust it for your load profile and equipment requirements.
How is battery-side current estimated?
Battery-side DC current is estimated as AC load W / (battery voltage x inverter efficiency).
Can this size a motor VFD?
No. Motor/VFD sizing depends on motor type, starting current, duty cycle, and manufacturer specifications. This tool does not replace VFD selection.