EV tariff whole-home worked examples
Compare EV tariffs across 1,000–5,000 kWh annual EV charging while including the rest of the home's electricity use.
Why EV charging cannot be judged in isolation
The annual EV-use range above shows how increasing charging demand can strengthen the value of a cheap overnight rate, but the household's non-EV electricity still matters. A tariff can save money on car charging and simultaneously cost more for daytime cooking, heating, appliances and general use.
That is why this tool compares the whole home. The useful inputs are annual EV charging energy, the share that can occur in the cheap window, ordinary household consumption and the day/night unit rates. Standing charges can also differ between tariffs and should be included when making a final comparison.
Convert driving into charging energy carefully
If you start from annual mileage, use a realistic wall-to-wheel charging figure rather than the vehicle's best advertised efficiency. Weather, motorway driving and charging losses can raise the electricity drawn from the meter. Test a higher-energy case as well as your expected case so the tariff decision is not based on an optimistic assumption.