What is the maximum EV charging speed on single phase power?

On a standard single-phase 32A circuit in Australia, the maximum AC charging rate is 7.4kW (230V x 32A). This adds approximately 40-50km of range per hour for most EVs. Installing a 22kW charger on a single-phase connection delivers no benefit - the charger will still only supply 7.4kW.

Do most Australian homes have single phase or three phase power?

Most Australian homes have single-phase power, although no official national figure exists. Three-phase is more common in larger newer homes, rural properties fed by three-phase lines, and homes upgraded earlier for a workshop or ducted air conditioning. Count the poles on your main switch, or ask an electrician to check.

How much does it cost to upgrade to three-phase power in Australia?

A three-phase upgrade typically costs $3,000-$8,000 depending on the distance from the street supply, state network charges, and switchboard work required. Some areas have long wait times for network upgrades through the distributor. In most cases, for EV charging purposes alone, the cost is difficult to justify unless you also have other three-phase loads or your EV supports 11kW+ AC onboard charging.

Which EVs support 11kW or 22kW AC charging in Australia?

Most EVs sold in Australia support 7kW or 11kW AC onboard charging. Examples with 11kW support include the Polestar 2, Volvo EX30, and some Mercedes-Benz models. Very few support 22kW AC - this is mainly older Renault Zoe variants not widely sold in Australia. The Tesla Model Y supports up to 11kW. Most BYD models are 7kW single phase, though the Sealion 7 accepts 11kW on three phase. Always check your specific variant's onboard charger specification.

Why is my 11kW three-phase charger only charging at about 3.5kW?

Your car probably has a single-phase onboard charger. An 11kW three-phase charger supplies 16 amps per phase, and a single-phase car can only draw from one of them: 230V x 16A is about 3.7kW, less after losses. A 22kW unit (32 amps per phase) or a 7kW single-phase charger fixes it.

Single Phase vs Three Phase EV Charging Australia

The single most common mistake Australian EV buyers make when choosing a home charger is spending money on a 22kW three-phase unit for a single-phase home. The charger will work fine - it will just charge at 7.4kW, the same as a charger that costs $400 less. Understanding the difference between single-phase and three-phase power is the foundation of every home EV charging decision.

The opposite mistake is less obvious and more painful. Put an 11kW three-phase charger on a three-phase home, plug in a car with a single-phase onboard charger, and you get about 3.5kW. That is half what a cheaper 7kW single-phase unit would deliver. We cover why, and how to fix it, further down.

How Single Phase and Three Phase Power Work

Australian grid power is alternating current at a nominal 230 volts. Single-phase connections use one active conductor, giving you 230V between active and neutral. Three-phase connections use three active conductors, each at 230V but offset by 120 degrees, giving 400V between any two active phases.

For EV charging, what matters is the maximum current draw. A dedicated home charging circuit is usually protected at 32A. On single phase, that means:

Single phase maximum: 230V x 32A = 7,360W (~7.4kW)

On three phase, each phase can carry 32A, so:

Three phase maximum (32A per phase): 3 x 230V x 32A = ~22kW

An 11kW three-phase charger runs each phase at only 16A: 3 x 230V x 16A = ~11kW. Keep that 16A figure in mind. It matters a lot if your car only charges on one phase.

This is why charger manufacturers offer 7kW, 11kW and 22kW variants. They are designed for different supply types and different cars.

What Single Phase Means for Charging Speed

At 7.4kW, most EVs add approximately 40-50km of range per hour. In practice:

EV Battery	Time to Full (7.4kW)	Range Added Per Hour
40 kWh (small city EV)	~6 hours	~45 km
60 kWh (mid-size SUV)	~9 hours	~45 km
77 kWh (Model Y, Ioniq 5)	~11 hours	~45 km
100 kWh (large SUV)	~15 hours	~45 km

For most Australian drivers covering 35-50km per day, plugging in overnight on single phase fully replenishes a typical day’s driving in 1-2 hours. The remaining overnight hours are unused capacity. Single phase is sufficient for the vast majority of Australian home charging needs.

Queensland was the exception until recently. Energex and Ergon used to cap single-phase home chargers at 20A (about 4.6kW) unless a network control device was fitted. That rule ended on 1 October 2026, so Queensland homes can now run a full 32A single-phase charger. Our QLD EV charger rules explainer covers what changed.

What Three Phase Adds

Three-phase supply enables faster AC charging for EVs whose onboard chargers support it:

Onboard Charger	Three Phase Benefit
7kW single phase (most BYD, MG, some Kia)	None - caps at 7kW regardless
11kW three phase (Tesla Model 3/Y, BYD Sealion 7, Polestar 2, some Volvo, Hyundai/Kia options)	Charges at 11kW - ~65km/hr
22kW three phase (rare in Australian market)	Charges at 22kW - ~130km/hr

The critical point: your EV’s onboard charger is the bottleneck, not the charger on the wall. The onboard charger (OBC) is the component inside your car that converts AC power from the wall into DC power stored in the battery. If your EV has a 7kW single-phase onboard charger, a 22kW wall charger delivers no speed benefit. Check your specific variant’s onboard AC charger rating before making any decisions about supply type.

Why an 11kW Three-Phase Charger Can Charge Slower Than a 7kW One

An 11kW three-phase charger gives a single-phase car about 3.7kW at best, because it only supplies 16 amps on each phase. A car with a single-phase onboard charger can only draw from one of those three phases. So it sees a 16A supply: 230V x 16A = 3.7kW, and usually 3.3 to 3.5kW at the plug once losses are counted.

This catches out a surprising number of owners. The common story goes like this: a solar and battery installer has an 11kW three-phase unit in stock, the house is three phase, the car is “only 7kW”, so 11kW sounds like plenty of headroom. Then the app shows 3.4kW. Switching the charger into single-phase mode doesn’t help either, because the per-phase current limit stays at 16A, and some units drop even lower in that mode.

The same trap applies to portable three-phase cables. An 11kW “three-phase” portable charger plugged into a 32A three-phase outlet at a caravan park or farm will still give a single-phase car around 3.5kW.

Your charger	Car with 7kW single-phase OBC	Car with 11kW three-phase OBC
7kW single phase (32A)	~7kW	~7kW
11kW three phase (16A per phase)	~3.7kW	~11kW
22kW three phase (32A per phase)	~7kW	~11kW
10A granny charger	~2.3kW	~2.3kW

Read across the table and the safe choice for a three-phase home becomes obvious. A 22kW unit is the only option that never short-changes either type of car. Brands like FoxESS list 11kW and 22kW versions of the same charger, and their A Series datasheet shows the 16A and 32A per-phase ratings side by side.

If you’ve already installed an 11kW unit, you have three practical fixes:

Swap it for the 22kW model. Ask your installer first. Many will exchange an unused unit, especially if they recommended it without checking your car. The electrician must confirm the cable and circuit breaker are rated for 32A per phase; a circuit sized for 16A will need upgrading.
Replace it with a 7kW single-phase charger wired to one phase. Your car gets its full 7kW and the unit is often cheaper.
Live with it. At 3.5kW you still add roughly 20km of range per hour, or about 200km over a 10-hour night. For a driver covering 40km a day that is enough, just slower to recover after a long trip.

Before anyone installs anything, check your car’s onboard charger rating for both single and three phase in the owner’s manual or the manufacturer’s spec sheet. Our charger speed calculator shows the real charge rate for any car and charger pairing.

Which Australian Homes Have Three Phase?

Most Australian residential properties are single phase. There is no official national split, so treat any precise percentage you see with caution. Three phase is more common in:

Newer estates in some states - some developers install three-phase as standard in premium developments
Rural properties - some rural grid infrastructure is three-phase at the street, making the connection cheaper
Homes with previous three-phase upgrades - ducted air conditioning systems, large workshops, or commercial-grade kitchen equipment sometimes prompted earlier upgrades
Homes in certain areas of WA and SA - network infrastructure varies by distribution zone

The quickest way to check: look at your switchboard. A single-phase switchboard has one main switch. A three-phase switchboard has three main switches or a combined three-pole main switch. If you are unsure, any licensed electrician can confirm in minutes.

When Three Phase Is Worth Upgrading To

A three-phase upgrade costs $3,000-$8,000 and requires a network application to your electricity distributor. That is a high bar to clear for EV charging alone. It is worth considering if:

Your current EV or your next EV supports 11kW+ AC charging - models like the Polestar 2, Volvo EX30, some Mercedes-Benz EVs, and some Hyundai/Kia variants. At 11kW, three phase adds meaningful speed over single phase.
You have two EVs in the household - two simultaneous 7kW charges draws 14.8kW, which is approaching the limit of a single-phase 63A supply and may require load management. Three phase distributes this load more cleanly.
You are also installing solar and battery - a large solar system (13kW+) with a battery inverter may benefit from three-phase supply for export balancing in some network zones.
You have other three-phase loads - a new workshop, ducted reverse-cycle system, or pool heat pump that also needs three phase makes the cost easier to justify across multiple uses.

If none of those apply: single phase with a quality 7.4kW charger is the right answer for most Australian homes. Do not spend $3,000-$8,000 on a supply upgrade to charge at the same speed you would get from a $1,000 single-phase charger.

Chargers for Single Phase Homes

Every major home EV charger sold in Australia supports single phase. The 7kW variants are designed specifically for single-phase supply:

Charger	Single Phase	Max Output	OCPP	Solar
Evnex E2 Core	Yes	7.4kW	Yes	Yes
Myenergi Zappi v2.1 7kW	Yes	7.4kW	Yes (cloud-to-cloud)	Yes (best in class)
Wallbox Pulsar Plus 7kW	Yes	7.4kW	Yes	Yes
Tesla Wall Connector	Yes	7.4kW	No	No
ABB Terra AC 7kW	Yes	7.4kW	Yes	Via OCPP

The Fronius Wattpilot 11J is missing from this list on purpose. It is a 16A-per-phase unit, so on single-phase supply it tops out around 3.7kW. For single-phase homes, the choice between the chargers above comes down to solar integration, OCPP, price, and warranty - not the phase supply. See our best home EV charger guide for a full comparison.

Chargers for Three Phase Homes

If you have three-phase supply and an EV with an 11kW+ onboard charger, consider:

Charger	Three Phase	Max Output	OCPP	Solar
Fronius Wattpilot Home 22J	Yes	22kW	Yes	Yes
Wallbox Pulsar Plus 22kW	Yes	22kW	Yes	Yes
ABB Terra AC 22kW	Yes	22kW	Yes	Via OCPP
Evnex X22	Yes	Up to 22kW	Yes	Yes

Because these are 22kW (32A per phase) units, they give a single-phase car its full 7kW, and they cap at 7.4kW if wired to single-phase supply. That is what makes a 22kW unit future-proof if you change EVs or upgrade supply later. An 11kW unit is not: it halves the speed for single-phase cars. For model-by-model prices, see our best three-phase EV charger guide.

The Practical Bottom Line

Single phase, 7kW EV onboard charger: buy any 7kW single-phase charger. Do not upgrade supply.
Single phase, 11kW EV onboard charger: you are leaving 3.6kW on the table but saving $3,000-$8,000. Only upgrade supply if you have other three-phase loads or a second EV.
Three phase already installed, any EV: install a 22kW charger, not an 11kW one. The incremental cost over the 7kW variant is small, the charger gives a single-phase car its full 7kW, and it is ready for any EV you buy in future.
Unsure what you have: have an electrician check before you buy anything.

Browse every charger we’ve reviewed on our EV chargers hub. For a full comparison of home charger models, see our best home EV charger guide. For what installation costs and electrical work to expect, see our EV charger installation cost guide. For solar-integrated charging, see our solar EV charging guide.

Single Phase vs Three Phase EV Charging: What Australian Homes Need to Know