How to Choose a Home EV Charger: A Decision Guide, Not a Brand Ranking
Faced with the choice, most people do the same thing: grab the biggest one “just in case.” It sounds sensible —more power, more future-proofing, more peace of mind— and it’s exactly the mistake that costs the most. Because the power that actually charges your car isn’t set by the charger on the wall: it’s set by the onboard charger built into the car. If yours accepts 7.4 or 11 kW on AC at most —and the vast majority do— a 22 kW unit won’t add a single mile of speed. You’ll have paid for hardware you’ll never use.
So the first decision isn’t “which brand,” it’s how much power you genuinely need. And the answer is almost annoyingly simple: for overnight charging in 90% of homes, 7.4 kW on a single phase is plenty. With that settled, the rest of the purchase becomes a handful of ordered decisions: phases, smarts, load management, solar and how the cable connects. Let’s take them one at a time.
How much power you need: single-phase or three-phase
Start by clearing up the underlying confusion. Single-phase versus three-phase isn’t “bad versus good” —it’s simply what you have at home. The lower ratings —3.7 and 7.4 kW— are single-phase; the higher ones —11 and 22 kW— require a three-phase supply that many homes don’t have and that costs money to add.
The math that matters fits on a napkin. A car uses 16 to 18 kWh per 100 km. Plug in 7.4 kW for eight hours overnight and you put back around 55-60 kWh: well over 300 km recovered while you sleep. How often do you actually drive 300 km in a day? That’s the whole question.
Here’s the trade insight, the one that’s expensive to ignore: before you buy anything, check your car’s spec sheet and find the maximum AC charging power. Not the rapid-charging figure from motorway pillars —that’s DC, a different thing entirely. Many EVs carry a 7.4 or 11 kW onboard charger. If that’s the case, a 22 kW charging station behaves exactly like an 11 kW one: the car caps at its own limit. You pay double for a ceiling you’ll never touch.
Smart or dumb: what connectivity buys you
The second fork is whether you want a “dumb” home charger —plug in and it charges— or a connected one with an app, metering and scheduling. It’s not a gimmick, and it isn’t mandatory either.
A basic charger does the job if you’re on a flat tariff or you simply charge overnight and forget about it. But the moment you have time-of-use pricing, connectivity pays for itself: you schedule the charge into the cheap off-peak window and that one setting trims the bill month after month. The app also gives you something less glamorous but genuinely useful: knowing how much energy went in, what it cost, and spotting when something’s off.
Where connectivity stops being optional and becomes necessary is in two scenarios: if you’re going to share power with the rest of the house (load management) or if you want to charge from your solar panels. Both require the charger to measure and decide —and only a smart unit does that.
Dynamic load management: the accessory that spares you a bigger supply
This is the point that saves the most money and the one fewest people know about when buying. Picture the classic scene: the oven’s on, the heat pump kicks in, someone fires up the hob, and on top of it all the car is charging. The main breaker trips and you’re in the dark. The brute-force fix is to upgrade your supply capacity —and pay that higher standing charge forever. The clever fix is dynamic load balancing.
It works with a current clamp (CT) on the home’s main feed that measures in real time what you’re drawing. The charger reads that figure and modulates its charge between 6 and 32 amps so the total never exceeds your contracted capacity. Switch the oven on and the car eases off; switch it off and it speeds back up. The breaker never trips and you don’t pay for a single extra watt.
The saving isn’t theoretical: avoiding a supply upgrade is money you never hand over again, year after year. And there’s a bonus —it lets car and heat pump coexist without fighting over amps. Many makers offer it as a module or accessory —Wallbox Power Boost, Easee Equalizer, go-e Controller, myenergi— so it’s worth confirming before you buy, because not every range includes it. I go into it in the guide to smart chargers and dynamic load management.
Solar compatibility: if you have panels, this changes the purchase
If you have panels or plan to fit them, a new requirement appears. An ordinary home charger charges at whatever power you ask for, whether the energy comes from the sun or the grid; it doesn’t care. To genuinely charge from your surplus you need a unit that measures what’s left over from your production and modulates the charge to consume exactly that.
There’s a technical detail here that decides the purchase. The minimum charge rate is 6 amps, which is about 1.38 kW on single-phase and 4.14 kW on three-phase. If your setup is three-phase and you only have 2 kW of surplus sun, a normal three-phase charger won’t even start because it can’t reach its minimum. That’s why the best self-consumption units switch automatically between 1 and 3 phases —Fronius Wattpilot, go-e Gemini, Zaptec, Huawei— milking every last cloudy watt of surplus. If solar is your priority, that detail matters more than the badge.
Tethered cable or open socket: convenience versus flexibility
The last decision is physical. A charging station with a tethered cable always has it hanging ready: pull up, plug in, done —no digging in the boot. A charging station with a socket (a type 2 outlet) means you bring your own cable, but it takes any cable and is more flexible if you ever change car or charge two different ones.
In practice: if it’s your spot and the same car always charges there, tethered wins on convenience. If the bay is shared or you want flexibility, the open socket is the smarter call. Either way the European standard is type 2; don’t overthink it looking for anything else.
Decision table: which criterion rules in your case
With all five decisions on the table, this grid sorts them by usage profile so you can see which one weighs most in your situation. It doesn’t compare brands: it compares criteria, which is what actually decides.
| Criterion | Pick the simple option if… | Pick the advanced option if… |
|---|---|---|
| Power / phases | Single-phase supply; normal overnight charging → 7.4 kW | You have three-phase and drive high daily miles → 11 kW |
| Connectivity | Flat tariff, just charge → basic | Off-peak tariff, solar or load management → smart |
| Load management | Comfortable supply headroom → not essential | Heat pump + car or tight supply → essential |
| Solar | No panels → any unit works | Panels with surplus → 1↔3 phase switching |
| Cable / socket | Own bay, single car → tethered cable | Shared bay or several cars → type 2 socket |
Notice the pattern: almost nobody needs to tick the advanced column on all five rows. Choosing well means identifying your two or three real criteria and not paying for the rest. If you’re still torn on power, I break it down in the amperage and single- vs three-phase comparison.
The mistakes that cost the most
You already know the first: buying 22 kW without checking the car’s onboard charger. It’s the classic and the priciest. But there are more.
- Upgrading your supply out of fear it’ll trip. Before raising your standing charge forever, try dynamic load management: it almost always solves the problem without touching the contract.
- Buying a basic charger and expecting to charge from solar. It can’t measure surplus; you’ll end up pulling from the grid thinking you’re running on sunshine.
- Forgetting the protective gear. The unit isn’t the only thing that makes an install safe; the RCD and the rest of the protection matter as much as the charger, and some models integrate part of it. I cover it in the mandatory electrical protection for EV chargers.
- Choosing by brand before criteria. Wallbox Pulsar Plus, V2C Trydan, Tesla Wall Connector, Easee and myenergi are all solid; but the “best” is the one that fits your five decisions, not the most famous.
Frequently asked questions
Is a 22 kW charger better even if my car can’t use it?
No. If your car’s onboard charger caps at 7.4 or 11 kW, 22 kW won’t charge any faster: the car limits itself. On top of that, 22 kW needs a three-phase supply and often a formal project. You pay for more hardware and installation to reach a ceiling you’ll never touch.
Do I need a smart charger or will a basic one do?
It depends on your tariff and your setup. On a flat tariff with no panels, a basic one is fine. If you have time-of-use pricing, want load management to avoid a supply upgrade, or plan to charge from solar, the smart one pays for itself.
What power do I need to charge at home overnight?
For most people, 7.4 kW on single-phase is enough. In eight hours you recover over 300 km, well above what an average driver covers in a day. Stepping up to 11 kW only makes sense if you have three-phase and rack up very high daily mileage.
Tethered cable or a charger with a socket?
Tethered if it’s your bay and the same car always charges there —more convenient. A type 2 socket if the bay is shared or you want flexibility for different cars. The European standard is type 2 in both cases.
Is dynamic load management included or separate?
It’s usually an accessory or module (a current clamp plus the function in the unit). Not every range includes it as standard, so confirm before buying if your contracted supply is tight or you’re pairing car and heat pump.
