Quick answer
Home EV charging cost is primarily battery energy required divided by charging efficiency, multiplied by the electricity rate that applies when you charge.
What matters most
- Off-peak, solar and free-power windows can change charging cost materially.
- Public DC fast charging should be modelled with its actual per-kWh price.
- Vehicle efficiency determines energy cost per kilometre.
EV decision framework
Separate charger power, vehicle energy consumption and electricity price. Charger kW determines speed; vehicle kWh/100 km determines energy use; your tariff determines home charging cost.
How to calculate it with SunnyWatly
Use the relevant calculator with your own bill, quote or vehicle information. Defaults are examples only and can become stale as tariffs, rebates and hardware change.
Do not rely on a headline figure alone. Ask what assumptions sit behind the estimate and whether they match your property, tariff and usage pattern.
What can change the result
- Electricity usage and time of day.
- Retail import and feed-in tariffs.
- Roof, shading, inverter or charger constraints.
- Hardware efficiency and usable capacity.
- Network limits and future tariff changes.
Primary public sources used by SunnyWatly