Tool category

Electrical calculators

8 specialised electrical calculators with instant, formula-based results.

Battery Runtime Calculator

Estimate how long a battery sustains a given electrical load.

Compute required cranking amps from engine size, fuel type and climate.

Check alternator headroom after adding audio, lighting or a fridge.

Pick the right wire gauge and fuse from current, run length and voltage drop.

Compute charging time from capacity, state of charge and charger current.

Check voltage drop on 12 V runs to pick a safe wire gauge.

Size a solar panel to offset parasitic battery drain while parked.

Work out how many days until no-start from a parasitic draw while parked.