Generator Recharge Time and Fuel Calculator

How long, and how much fuel, to top up the batteries?

Use your charger's output and the generator's fuel use at about that load. Everything is worked out in your browser. Nothing is saved or sent anywhere.

1. Battery

2. Charger and generator

3. Results

How it was worked out

    What this does and doesn't tell you

    • Chargers slow down near full, so the last part takes longer.
    • Generators must be run outdoors, well away from doors and windows. Exhaust can kill.
    • Safety: in Australia, any work on 240V AC wiring, including connecting an inverter, battery or solar system to a home's switchboard or fixed wiring, must be done by a licensed electrician.
    ↑