Charge Your EV from Solar Panels: UK Guide 2026
If you have solar panels and you are thinking about an electric car, the obvious question is: can I charge it for free from my roof? The answer is yes, mostly - but the details matter more than you would think. Here is the real maths, the hardware you need, and why a home battery changes everything.
The Basic Maths: How Many Panels to Charge an EV?
An average UK EV does about 4 miles per kWh. A 30-mile daily commute needs roughly 7.5 kWh. A 40-mile round trip needs about 10 kWh. Here is what that means in panels:
| Daily mileage | Energy needed | Panels (summer) | Panels (annual avg) |
|---|---|---|---|
| 20 miles | 5 kWh | 4-5 panels (~1.7 kW) | 6-8 panels (~2.5 kW) |
| 30 miles | 7.5 kWh | 6-8 panels (~2.7 kW) | 8-10 panels (~3.5 kW) |
| 50 miles | 12.5 kWh | 8-10 panels (~3.5 kW) | 12-14 panels (~5 kW) |
| 80 miles | 20 kWh | 12-14 panels (~5 kW) | 16-20 panels (~7 kW) |
A 4 kW array (about 8-10 panels) in southern England will produce roughly 3,400 kWh per year. That averages out to about 9.3 kWh per day - but the seasonal swing is brutal. In June you might get 18-20 kWh on a sunny day. In December you are lucky to see 3-4 kWh. If you want to charge an EV year-round from solar alone, you need a much bigger array than the daily-average number suggests, or you accept that winter charging comes from the grid.
The Hardware: Solar-Compatible EV Chargers
A standard EV charger will pull whatever power the car needs from the grid - it does not know or care whether your panels are generating. To charge specifically from your solar, you need one of two things:
- A solar-compatible smart charger that monitors your export and diverts surplus to the car
- A home battery acting as a buffer, paired with any charger
Solar-Diverting Chargers
These chargers use a CT clamp on your meter tails to detect when you are exporting to the grid. When export exceeds about 1.4 kW (the minimum an EV can accept), it ramps up the car's charge rate to match. When a cloud passes, it throttles back. The three main players in the UK:
Zappi v2
The most popular solar EV charger in the UK. Three modes: Fast (grid + solar), Eco (solar only), Eco+ (100% solar, stops when sun drops). Works with any inverter, has a good app, and MyEnergi's UK support is solid. Untethered or tethered versions.
7 kW Type 2 Solar divertFrom £749 (untethered)
Check current prices on Amazon UK or MyEnergi's site
Ohme Home Pro
Smart tariff integration is the standout feature - it talks directly to Octopus Intelligent Go and schedules charging when rates are cheapest. Solar integration exists but is less polished than Zappi's. Good if you are more interested in tariff arbitrage than pure solar charging.
7 kW Type 2 Tariff smartFrom £549
Check current prices on Amazon UK or Ohme's site
Hypervolt Home 3
Solar charging via the app, with a clean design and good UK support. The solar mode is less granular than Zappi's but it covers the basics. Solar integration requires the optional CT clamp kit.
7.4 kW Type 2 Solar readyFrom £515
Check current prices on Amazon UK or Hypervolt's site
The Home Battery: The Missing Piece
Solar EV charging without a battery has one big problem: your car is parked at work during the sunniest part of the day. A typical commute means the car leaves at 8 am and returns at 6 pm. Peak solar generation is 11 am to 3 pm. Without a battery, that midday solar goes to the grid for pennies.
A home battery fixes this. Charge the battery during the day, then dump it into the car when you get home. A 9.5 kWh battery like the GivEnergy All in One can store a full day's commute-worth of solar and release it in a couple of hours. Read our full guide to home battery storage for the options and costs.
Solar vs Overnight Tariffs: Which Is Cheaper?
This is where the maths gets interesting. Solar-generated electricity costs about 5-8p/kWh when you amortise the panel and inverter cost over 25 years. That beats the price cap (26.11p/kWh) by a mile. But Octopus Intelligent Go offers 7p/kWh for overnight EV charging. At that rate, solar and grid are basically tied on raw pence-per-kWh.
| Charging method | Cost per kWh | Cost per 30-mile charge | Annual cost (10k miles) |
|---|---|---|---|
| Own solar (amortised) | 5-8p | 38-60p | £125-£200 |
| Octopus Intelligent Go (night) | 7p | 53p | £175 |
| Price cap (day rate) | 26.11p | £1.96 | £653 |
| Public rapid charger | 65-85p | £4.88-£6.38 | £1,625-£2,125 |
The real win is not picking one or the other - it is using both. Charge the car overnight on the 7p tariff, let the solar fill the home battery during the day, and use that stored solar to run your house in the evening. That way you avoid importing at 26.11p/kWh during peak hours, and your EV charging cost is still near-zero. This is the setup most solar-plus-EV households end up with.
If you are on Octopus - and honestly if you have solar and an EV you probably should be - use our referral link and we both get £50 credit.
The Full Setup: What It Costs
Here is a realistic solar-plus-EV-charging setup for a typical UK semi with a 30-mile daily commute:
| Component | Typical spec | Estimated cost |
|---|---|---|
| Solar panels | 4-5 kW (10-12 panels) | £5,000-£7,000 installed |
| Home battery | 9.5 kWh (GivEnergy All in One) | £4,500-£5,500 installed |
| Solar-compatible EV charger | Zappi v2 or Ohme Home Pro | £550-£1,100 installed |
| Total | £10,000-£13,600 |
Against that, the annual saving is roughly £480-£530 on EV fuel (vs price-cap daytime charging for 10k miles) plus whatever you save on household electricity by running off solar and battery in the evening. Total annual saving is typically £700-£1,000 depending on your household usage. Simple payback lands around 10-14 years, which lines up with the 25-year panel warranty and the 10-year battery warranty.
If you already have the solar and battery, adding an EV charger is a £550-£1,100 job that pays back in about two years from fuel savings alone. That is the sweet spot.
DIY or Get an Electrician?
EV charger installation is notifiable work under Part P of the Building Regulations in England and Wales. You need a qualified electrician to install the dedicated circuit from your consumer unit, fit the CT clamp for solar monitoring, and test and certify the installation. This is not a DIY job and your house insurance will not cover you if you do it yourself.
The good news: most charger brands have approved installer networks, and the OZEV grant scheme (if it is still running when you read this) can knock £350 off the installation cost. Read our solar installation guide for what to expect from an installer visit, or head to get quotes from local installers to find someone near you.
Common Questions
How many solar panels do I need to charge an electric car?
A typical UK driver doing 30 miles a day needs about 7-8 kWh to recharge. In summer, a 4 kW solar array (about 8-10 panels) can cover that on a sunny day. In winter you will need the grid - a 4 kW array might only produce 3-4 kWh on a grey December day. Most people run a hybrid approach: solar when the sun is out, cheap overnight tariff the rest of the time.
Do I need a special EV charger to use solar panels?
You need a solar-compatible smart charger that can divert excess solar to your car rather than exporting it. The Zappi is the most popular solar-compatible EV charger in the UK and works with any solar inverter. Ohme and Hypervolt also offer solar integration features. A standard dumb charger will still charge your car from solar if you have a home battery acting as a buffer, but you lose the ability to prioritise solar-only charging.
Can I charge my EV entirely from solar in the UK?
In summer, yes - a 5 kW+ array with a home battery can cover a 30-mile daily commute entirely from solar on sunny days. In winter, no - UK solar production drops to about 10-15% of summer levels and you will need grid charging. A realistic full-year split for an average UK home with a 4 kW array and a 10 kWh battery is roughly 60-70% solar in summer months, dropping to 10-20% in December and January.
Is it cheaper to charge an EV from solar or a cheap overnight tariff?
At 26.11p/kWh (the current price cap), solar is cheaper than any grid tariff - your solar-generated electricity costs about 5-8p/kWh amortised over the panel lifespan. However, Octopus Intelligent Go offers 7p/kWh overnight EV charging, which undercuts even solar on a per-kWh basis. The real saving comes from using solar during the day AND a cheap tariff at night, routing excess solar into a home battery to offset your evening household load.
What size home battery do I need for EV charging?
An average UK daily commute (30 miles, ~4 mi/kWh) needs about 7.5 kWh. A 9.5 kWh battery like the GivEnergy All in One covers that with headroom. If you charge overnight on a cheap tariff you may not need a battery at all - just plug in during off-peak hours. The battery really earns its keep by storing daytime solar for evening use, not just for EV charging. Our battery payback calculator can model this for your usage pattern.