Verify the inputs
Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.
Independent energy/ CALCULATOR
Generator-assisted battery recharge plan
Estimate recharge time, generator-side demand and fuel for a stated battery deficit.
FROM ESTIMATE TO ACTION
Use the result, not just the number.
Keep the calculation traceable
Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.
Confirm the decision
Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.
Inputs to verify
- Battery energy deficit (kWh)
- Energy that must actually be added to the battery between the chosen states of charge.
- Average battery-side charge power (kW)
- Use sustained power accepted by the battery, after any taper or control limits.
- AC-to-battery efficiency (%)
- Combined conversion efficiency from generator AC output to stored battery energy.
- Concurrent household load (kW)
- Average load supplied by the generator while the battery charges.
- Fuel use at planned load (L/h)
- Use manufacturer data or measurement near the calculated combined load.