If you’ve just bought an EV or are planning to, looking at home chargers can quickly get confusing with all the technical details.
7kW, 11kW, 22kW.
There are three main options, each at a different price. It’s not always clear which one fits your home, car, or daily routine. Most people worry less about slow charging and more about paying for a fast charger their car can’t use, or spending on a three-phase upgrade they might not need.
After installing EV chargers across Sydney and regional NSW, PSC Energy has seen that most people don’t need the fastest charger. Some do, but it usually comes down to your car, your home’s power, and how much you drive.
In this article, you’ll learn about the following:
- What the kW Number on a Home EV Charger Actually Means
- 7kW Home EV Chargers
- 11kW Home EV Chargers
- 22kW Home EV Chargers
- Your Car’s Onboard Charger: The Bottleneck Most People Miss
- Single-Phase vs. Three-Phase Power: What Your Home Can Actually Support
- How EV Charger Speed Interacts with Solar
- Which EV Charger Speed Is Right for You?
- FAQ: 7kW vs. 11kW vs. 22kW Home EV Charger Questions
This guide will break it all down clearly. By the end, you’ll know which charger speed fits your needs.
What the kW Number on a Home EV Charger Actually Means
The kW rating tells you how much power the charger delivers each hour. A higher number means faster charging. Here’s a simple way to picture it:
- A 7kW home EV charger adds roughly 40–50 km of range per hour, depending on your EV.
- An 11kW home EV charger adds roughly 60–70 km of range per hour.
- A 22kW home EV charger adds roughly 120–130 km of range per hour.
Most Australians drive between 30 and 60 km a day. If you park your car in the garage overnight for about 10 hours, a 7kW charger can fully recharge a 60 kWh battery from nearly empty. Many articles don’t mention this important point right away.
7kW Home EV Chargers
A 7kW charger runs on single-phase power, which most Australian homes have. It draws 32 amps from one line and can easily handle overnight charging for most EV owners.
- It suits commutes of up to 100 km per day.
- It works on any standard home electrical setup without supply upgrades.
- It typically costs less to install than three-phase charger options.
- Most EVs on Australian roads accept 7kW AC charging.
If you drive a typical distance each day and park your car overnight, a 7kW charger is usually all you need.
11kW Home EV Chargers
An 11kW charger needs three-phase power. It draws 16 amps from each phase, so you get faster charging without exceeding your home’s power limits.
- It suits households that already have three-phase power and want faster charging without jumping to 22kW.
- Some EVs cap their AC charging rate at 11kW, so this tier is the fastest option for those cars, even if you install a 22kW unit on the wall.
People often overlook the 11kW option, but it’s usually the best pick for homes with three-phase power and EVs that can’t charge faster than 11kW AC.
22kW Home EV Chargers
A 22kW charger also needs three-phase power and draws 32 amps from each phase, using the full capacity. This is the fastest home AC charging speed available in Australia.
- It suits drivers who regularly cover 150 km or more per day.
- It suits households with two or more EVs sharing a single charger circuit.
- It suits people who charge during short daytime windows rather than overnight.
- For most people who park overnight and drive regular distances, a 22kW charger is more than necessary.
If you’re interested in learning a bit more about public charging stations, you might want to check out the following article titled, Electric Vehicle (EV) Charging Guide 2026.
Your Car’s Onboard Charger: The Bottleneck Most People Miss
This detail often changes people’s minds about which charger to choose.
Every EV has an onboard charger (OBC) inside. The OBC converts AC power from your wall into DC power for the battery.
It has its own speed limit, so your car can’t charge faster than that, no matter how powerful your wall charger is.
Here’s what that means in practice:
- If your car’s OBC maxes out at 7kW, a 22kW wall charger still only pushes 7kW into the battery.
- If your car’s OBC maxes out at 11kW, a 22kW wall charger still only pushes 11kW into the battery.
- You only get the full benefit of a 22kW charger if your car’s OBC accepts 22kW AC input.
Common OBC limits for popular EVs in Australia:
- Tesla Model 3 (Standard and Long Range): 11kW AC maximum
- Tesla Model Y: 11kW AC maximum
- BYD Atto 3: 7.2kW AC maximum
- Hyundai Ioniq 6: 11kW AC maximum
- Kia EV6: 11kW AC maximum
- MG4: 6.6kW AC maximum
- Nissan Leaf (older models): 3.6–6.6kW AC maximum
Look up your car’s manual or the manufacturer’s specs before picking a charger. Doing this clears up most of the confusion about charger speeds.
Single-Phase vs. Three-Phase Power: What Your Home Can Actually Support
Your home’s power supply determines which charger speeds you can use. Many Australian homes have single-phase power.
Newer homes, larger properties, rural areas, and some older homes in certain suburbs have three-phase. Here’s how to check:
- Check your switchboard. Three rows of circuit breakers (or three main fuses) suggest three-phase power.
- Look at your electricity meter. If you see four wires, three active and one neutral, you likely have three-phase power.
- Ask a licensed electrician. They can confirm in a few minutes.
What each power type means for your charger:
- Single-phase homes can run a 7kW charger. That is the ceiling without a supply upgrade.
- Three-phase homes can run 7kW, 11kW, or 22kW chargers, depending on the model and the car.
You can upgrade from single-phase to three-phase, but it’s expensive. In NSW, a three-phase upgrade usually costs $3,000 to $8,000, depending on how far the supply runs from the street to your meter box.
This cost makes sense if you also need to run heavy workshop equipment, a large solar and battery system, or a commercial setup. For EV charging alone, it’s usually hard to justify.
If you’re interested in learning a bit more about single-phase and three-phase sites, you might want to check out the following article titled, Single-Phase vs. Three-Phase: How Are They Different?
How EV Charger Speed Interacts with Solar
If you have solar panels, how your charger works with your solar system matters just as much as the kW rating.
Solar-smart chargers watch your home’s energy use and adjust charging speed as needed.
- When your solar panels produce more power than your home uses, the charger speeds up.
- If your home needs more power, the charger slows down.
This can affect which charger speed is best for you:
- A 7kW smart charger can charge your EV almost entirely from solar surplus if your panels produce enough excess.
- A 22kW charger running at full power on a cloudy day draws heavily from the grid, which cancels out much of the benefit of owning solar.
Charger brands with strong solar-smart charging support:
- Zappi — brand-agnostic, works with most solar inverter brands, 7kW single-phase or 22kW three-phase
- Sigenergy AC EV Charger — best performance inside the Sigenergy energy ecosystem
- Enphase IQ EV Charger 2 — integrates tightly with the Enphase solar monitoring platform, 5-year warranty.
For most homes with solar, a 7kW smart charger that works well with your solar system is more practical than a 22kW charger without smart features.
If you’re interested in learning a bit more about charging EVs, you might want to check out the following article titled, How Much Solar (and Battery) Do You Need to Charge an EV in Australia?
Which EV Charger Speed Is Right for You?
Just follow these steps in order.
Step 1 — Find your car’s maximum AC charging rate
Check your EV’s onboard charger (OBC) limit in the manual or on the manufacturer’s website. That’s your maximum charging speed. There’s no need to buy a charger that’s faster than what your car can use.
Step 2 — Find out if your home has single-phase or three-phase power
- Single-phase: your charger options stop at 7kW.
- Three-phase: 7kW, 11kW, and 22kW are all available.
Step 3 — Consider how many kilometres you drive per day
- If you drive less than 100 km a day, a 7kW charger will easily charge your EV overnight.
- If you drive between 100 and 200 km a day, consider an 11kW charger if your car and home support it.
- If you drive more than 200 km a day, or have two EVs sharing one charger, a 22kW charger could be a good fit if your cars can use it.
Step 4 — Factor in your solar setup
- If you have solar, focus on smart solar charging features instead of just speed.
- If you don’t have solar, choose a charger speed that matches your car’s OBC limit and how far you drive each day.
If you’re unsure about any of this, talk to an installer before you buy.
If you’re interested in learning a bit more about charging your EV from solar, you might want to check out the following article titled, Considerations for Charging Your Electric Vehicles with Solar.
Wrapping Up: The Right Charger is a Current Affair
The best home EV charger speed depends on three things: what your car can handle, what your home’s power supply supports, and how far you drive each day.
Before you buy, check your car’s onboard charger limit and whether your home has single-phase or three-phase power. These two answers make the decision much easier.
PSC Energy installs EV chargers throughout Sydney and regional NSW. Our team works with all major brands and can explain in simple terms which charger speed fits your home, car, and energy needs. It’s what we do.
If you’re interested in learning more about EV chargers, you might want to check out this guide titled, The 10 Best Home EV Chargers in Australia.
FAQ: 7kW vs. 11kW vs. 22kW Home EV Charger Questions
Is a 7kW home EV charger fast enough for overnight charging in Australia?
For most households, yes. A 7kW charger adds around 40–50 km of range per hour. Over a 10-hour overnight window, covering 400–500 km of range. It falls short only for high-km drivers who arrive home with a near-empty battery and need a full charge before early morning.
What is the difference between a 7kW and a 22kW home EV charger?
A 7kW charger runs on single-phase power and adds roughly 40–50 km of range per hour. A 22kW charger needs three-phase power and adds roughly 120–130 km of range per hour. The practical difference depends entirely on whether your car’s onboard charger supports 22kW AC input. Many popular EVs cap at 7kW or 11kW, so a 22kW wall unit will not make them charge faster.
Do I need three-phase power to get a faster home EV charger?
Yes. Both 11kW and 22kW home chargers require three-phase power. If your home has single-phase power, 7kW is the maximum available to you without a supply upgrade. A three-phase upgrade in NSW costs $3,000 to $8,000 or more and makes financial sense only when you have other reasons to upgrade beyond EV charging alone.
What is the best EV charger speed for a home with solar panels?
The best charger for a solar home is one with strong solar-smart charging capability, not necessarily the fastest one. A 7kW smart charger that reads your solar output and draws only from surplus production costs far less to run than a 22kW charger pulling from the grid. Zappi, Sigenergy, Enphase, and GoodWe all offer solar-integrated options.
Why would I choose an 11kW home EV charger over a 22kW charger?
Because your car may not accept more than 11kW AC, regardless of what sits on your wall. If your EV’s onboard charger caps at 11kW — which covers Tesla Model 3, Tesla Model Y, Hyundai Ioniq 6, and Kia EV6 — an 11kW wall unit delivers full charging speed for that car. A 22kW charger adds cost without adding speed for those vehicles.
Can a 22kW home EV charger make my car charge faster than its maximum charging rate?
No. The car’s onboard charger sets the speed ceiling, not the wall unit. If your EV’s onboard charger caps at 7kW, every AC charger from 7.4kW to 22kW delivers the same charging speed. You only see the benefit of a 22kW wall unit if your car’s onboard charger accepts the full 22kW input rate.
How long does it take to charge an EV with each charger speed?
For a 60 kWh battery starting from near empty:
- 7kW charger: roughly 8–9 hours
- 11kW charger: roughly 5–6 hours
- 22kW charger: roughly 3 hours
For most households, the overnight window means all three speeds deliver a full charge by morning. Charging speed matters most when your available charging window is short.
Is it worth upgrading to three-phase power just to run a faster EV charger?
In most cases, no. The cost of a three-phase upgrade outweighs the benefit for typical home EV charging. If your home already has three-phase power, moving to 11kW or 22kW can be worthwhile. If it doesn’t, and the only reason to upgrade is faster EV charging, a 7kW single-phase charger almost always does the job.
Does a faster home EV charger work better with solar?
Not automatically. A faster charger draws more power and can pull from the grid just as easily as from solar. The factor that determines how much free solar power you use is smart charging software, not raw charger speed. A slower smart charger often uses more solar than a faster dumb charger.
