EV Charging Time Calculator

Home charging speed is limited by the smaller of two things: the circuit feeding the charger, and the car's own onboard charger. Buying an 80A wall unit for a car that accepts 32A buys nothing except a much more expensive electrical installation.

Enter both and the calculator shows which one is actually setting the pace.

Why 80% is the usual target

Charging slows markedly as the battery fills, and on DC fast chargers the last 20% can take as long as the first 60. For daily home charging the taper matters less, but there is still little reason to sit at 100% except before a long trip.

Before paying for a bigger circuit

Ask three questions:

1. What does the car accept? If it is 7.4 kW, a 48A circuit is already more than enough.
2. How long is the car parked? Twelve hours overnight at 7 kW adds far more than most people drive in a day. Faster charging solves a problem you may not have.
3. Can the panel take it? A load calculation decides this, and a service upgrade is the most expensive part of any home charging project by a wide margin.