Single Phase vs Three Phase EV Charging: Which Do You Need?

Australian homes receive electricity from the grid as either single-phase or three-phase power. The difference is simple: single-phase uses one active wire, three-phase uses three. More wires means more power capacity.

Single-phase power is standard in most Australian homes. It delivers up to 230V and is limited to about 7.4kW for EV charging (a 32-amp circuit at 230V). This is more than enough for most households.

Three-phase power delivers up to 400V across three active wires. This supports up to 22kW for EV charging (32 amps x 400V). It is common in newer homes, rural properties, and homes with large air conditioning systems, workshops, or pool pumps.

The speed difference between single-phase and three-phase is significant:

For context: the average Australian drives about 40km per day. A single-phase charger recovers that in about one hour. Even on a busy day of 100km driving, single-phase charging overnight (8+ hours) fully recovers the battery.

You can check whether your home has single-phase or three-phase power in two ways:

Check your meter: A single-phase meter has one set of dials or a single LCD display. A three-phase meter has three sets of dials or displays labelled L1, L2, L3.

Check your switchboard: Open your switchboard and count the main switch poles. A single-phase main switch has one or two poles (single width). A three-phase main switch has three poles (three times the width). If you see a three-phase isolator at the top of the board, you have three-phase.

Not sure? Ask any licensed electrician during a free EV charger quote. They will check as part of the site assessment.

Upgrading to three-phase power costs $1,000-$2,500 depending on your location and existing electrical infrastructure. This is on top of the charger and installation cost.

Three-phase makes sense if:

• You drive over 100km daily and need fast recovery
• You have two or more EVs charging at home
• You already have three-phase for other appliances (workshop, AC)
• You have a large solar system (10kW+) and want to maximise solar charging during daylight hours
• Your EV supports 11kW or 22kW onboard charging (check your EV spec sheet)

Stick with single-phase if:

• Your daily driving is under 80km
• You charge overnight (8+ hours available)
• Budget is a priority (save $1,000-$2,500 on the three-phase upgrade)
• Your EV only supports 7.4kW AC charging (many BYD and earlier Tesla models)

A common misconception: a 22kW wall charger does not automatically charge at 22kW. Your EV's onboard charger is the bottleneck.

Many popular EVs sold in Australia have single-phase onboard chargers that max out at 7.4kW, regardless of what wall charger you install. For example, the BYD Atto 3 has a 7kW onboard charger, so a 22kW wall charger will still only charge at 7kW.

Before buying a three-phase charger, check your EV's onboard charger spec. If your EV only supports single-phase AC, a three-phase wall charger provides zero benefit for AC home charging.

EVs with three-phase onboard chargers (11kW or 22kW) include certain variants of the Kia EV6, Hyundai Ioniq 5, Polestar 2, and several European models. Check your specific variant's specs.