EV charging assumptions

EV charging cost estimates depend on more than the headline electricity price. A realistic estimate should consider mileage, efficiency, charging losses and the tariff used for most charging sessions.

Tariff matters

Home charging on an overnight tariff can look very different from public rapid charging. When comparing EV costs with petrol or diesel, use the mix of charging you expect to use in real life.

Efficiency changes

Vehicle efficiency can change with speed, weather, tyres, terrain, load and heating use. A cautious estimate should test a less efficient winter scenario as well as a normal one.

Charging losses

Not every kWh drawn from the wall reaches the battery. Charging losses are normal, so a simple calculation may understate real cost if it ignores them.