How fast can you charge an EV at home? Charger speeds explained

Ask new EV owners what worried them before buying and charging time comes up early. A petrol tank fills in five minutes, so a battery that needs hours feels like a step backwards.

Home charging runs on a different logic. The car sits in the driveway for ten or twelve hours most nights, so the real question is whether it charges fast enough for tomorrow. That depends on three things working together: the charger, the property's electrical supply and the car itself.

What actually sets the charging speed?

Charging speed is measured in kilowatts (kW), and the slowest link in the chain decides it. A home charger can only deliver what the property's supply allows, and the car can only accept what its onboard charger was built for.

That last point catches people out. Every EV has an onboard charger that converts AC power from the home into DC power for the battery, and many popular models cap AC charging at 7kW or 11kW. Plug one into a 22kW wall box and it still charges at its own limit.

Battery size matters too. A small hatchback and a large SUV can charge at the same rate, yet the SUV takes longer because there's more battery to fill.

How fast is a standard power point?

Every EV sold in Australia can charge from a normal 10-amp power point using the portable cable supplied with most cars. It's slow. A standard outlet delivers roughly 2.4kW, which works out to somewhere around 10 to 15 kilometres of range for each hour plugged in, depending on how efficient the car is.

For someone driving 30 kilometres a day, that can be enough. Plug in after dinner, unplug at seven, done.

Problems start with longer commutes, a second EV or a week where the battery drops lower than usual. Older wiring is another concern. Pulling close to maximum current through an ageing circuit for hours on end isn't what those circuits were designed for, so it's worth having an electrician check it first.

How fast is a 7kW single-phase wall charger?

This is where most Australian homes land. A dedicated wall charger on single-phase power runs at about 7kW, roughly three times faster than a power point. In everyday terms, that adds somewhere between 35 and 45 kilometres of range per hour.

Take an illustrative example. A car with a 60kWh battery that comes home at 20 per cent needs about 36kWh to reach 80 per cent. At 7kW, that's a little over five hours. Plugged in at 8pm, it's finished well before midnight. For most daily driving, that's plenty.

Installation is more than mounting a box on the garage wall. A wall charger needs its own circuit, and the switchboard has to carry the extra load. A licensed electrician will assess switchboard capacity and electrical load before fitting a charger, and will recommend an upgrade where the existing board can't safely take it.

When does three-phase charging make sense?

A home with three-phase power can run a wall charger at up to 22kW. On paper that's three times quicker than single-phase. In reality the benefit depends almost entirely on the car. If its onboard charger tops out at 7kW or 11kW, a 22kW unit changes very little.

Checking the supply is simple. One main switch on the switchboard usually means single-phase, while three linked switches suggest three-phase. Most suburban houses are single-phase, and converting gets expensive once network and switchboard work are added up.

Three-phase earns its keep for two EVs sharing one charger, rideshare drivers who need a quick daytime turnaround, or businesses charging work vehicles between jobs. For a household that drives to work and back, it's usually more charger than the car will use.

How do you choose the right speed for your household?

Daily kilometres matter more than maximum kW. Work out a normal day's driving, add a buffer, then compare it with how long the car sits at home.

The car's maximum AC charging rate is listed in the owner's manual or spec sheet. Buying a charger faster than the car can accept rarely pays off.

And before buying anything, get the property assessed. A licensed electrician can confirm switchboard capacity, the length of the cable run and where the charger can sit without leads trailing across the driveway. The assessment doesn't have to lock you into a particular brand either, since some installers will fit a charger you've already bought, so it's worth asking before you choose a unit. For households weighing up home EV charger installation, that early check usually settles the speed question as well.

So how fast is fast enough?

A charger is fast enough if the car is ready every morning. For most households a 7kW single-phase unit passes that test easily, and a power point might too if daily distances are short. Faster options only help when both the car and the property can use them.