How to choose an EV charger that works with your solar panels (UK)

Helpful video reference. The video above is "Which EV Charger Is The BEST For Solar?" by Artisan Electrics, a Cambridge-based electrical company with over 250,000 YouTube subscribers. They install EV chargers and solar systems regularly and their comparison covers the main UK models that support solar surplus diversion honestly and from genuine installation experience.

1. Why a standard charger cannot "see" your solar

Most plug-in EV chargers are simple devices: they open a relay and allow current to flow at whatever rate you have set. They have no connection to your inverter and no awareness of what your solar panels are producing at any given moment.

The result is that your car charges from the grid most of the time, even when your panels are exporting surplus energy. You pay import rates for charging and receive export rates for the surplus, which in the UK are typically several pence per unit apart.

A solar-aware charger solves this by measuring the net import or export at your grid connection point (usually via a CT clamp around the incoming supply cable) or by reading your inverter's data directly. When it detects surplus generation, it raises the charge rate to absorb it. When generation drops, it reduces the rate or pauses charging.

2. CT clamp sensing versus inverter integration

There are two main approaches to making an EV charger solar-aware:

• CT clamp on the grid connection: The charger installs its own current transformer on the main supply cable, independent of the solar inverter. The Zappi by myenergi and the Indra Smart Pro use this method. It works with any inverter, any system age, and any export arrangement. The installer clips the CT on during charger commissioning.
• Inverter data integration: The charger reads surplus generation directly from the inverter via the home network, using the inverter's API or a cloud connection. Ohme, Wallbox Pulsar Plus and some other chargers take this route. It is slicker in operation but depends on the inverter's connectivity and on the cloud services of both the charger and inverter brands remaining compatible.

For most UK domestic installations with a single inverter, both approaches work well. The CT clamp method is more robust long-term because it does not depend on software integrations that can break when either manufacturer updates their systems.

3. Minimum charge rate and overcast days

EV chargers cannot charge at arbitrarily low power. The minimum for a Mode 3 AC charger is typically around 1.4 kW (6 A at 230 V), limited by the on-board charger in the car and the minimum current the EVSE can reliably supply.

When your solar surplus falls below this threshold (on a cloudy morning, for example), the charger has to decide: stop charging entirely, charge slowly from the grid, or wait for the surplus to rise. Most solar-aware chargers offer all three options via a setting in their app. If your priority is maximum solar use, choose the "solar only" mode and accept that charging pauses on overcast days. If you need to guarantee the car is charged by morning, set a grid fallback.

4. Smart tariff compatibility

Many households with solar also have a smart tariff such as Octopus Energy's Agile or Go, which offer very cheap (sometimes negative) overnight electricity rates. A good solar-aware charger handles both: it uses solar surplus during the day and cheap grid overnight.

Before choosing a charger, check whether its app integrates directly with your tariff. Ohme has strong Octopus Energy integration. Zappi works with most tariffs but requires manual schedule setting. Some chargers only expose basic scheduling.

5. Three-phase versus single-phase

Most UK domestic properties have a single-phase 230 V supply, which limits an EV charger to a maximum of 7.4 kW. If your property has a three-phase supply (common in larger detached houses and rural properties), you can install a 22 kW charger. This matters less for solar integration (UK panels rarely generate 22 kW) but affects the speed of scheduled overnight charging.

Check with your electrician whether your supply is single or three-phase before specifying a charger. The cabling and consumer unit protection requirements differ.

6. Grant eligibility and OZEV registration

The OZEV EV Chargepoint Grant (up to £350 per charge point, current as of 2026) requires the charger to be on the government's approved products list and the installer to be OZEV-registered. Most major solar-aware chargers, including the Zappi, Ohme and Wallbox, are on the approved list. Confirm this at the time of purchase as the list is updated.

Your installer should handle the grant claim as part of their registration process. If they are not OZEV-registered, you cannot claim the grant through that installation.

7. What your electrician needs to know

Before your electrician quotes, confirm these points: the proposed charger location (garage wall, driveway, house wall), the distance from the consumer unit, the solar inverter brand and model, whether a CT clamp is included with the chosen charger, the supply phase count, and whether your consumer unit has a spare way for a dedicated 32 A circuit.

Most solar-aware charger installations in a standard UK home take half a day to a full day depending on cable route complexity.

When to call us

Richard installs EV chargers across Sandwich, Deal, Dover, Ramsgate and Canterbury. He is OZEV-registered and has experience with solar-integrated installations. If you already have solar and want a charger that uses it properly, get in touch with the inverter brand and model and the proposed charger location and he will give you a straight quote.