This calculator is a planning estimate, not a guarantee. Actual runtime varies with inverter losses, temperature, battery state, appliance cycling and surge behavior.
Runtime calculator
Estimated runtime
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How the estimate works
Runtime ≈ battery Wh × efficiency ÷ average watts. A refrigerator, air conditioner or pump cycles on and off, so its nameplate wattage may not equal its average draw over an hour.
FAQ
Why use 85% efficiency?
It is a conservative planning factor for AC loads. Real efficiency can be higher or lower depending on the inverter, load size and operating conditions.
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