Yes, and the honest follow-up is: partly, and how well depends on your array, your roof, and when the car is actually at home.
Eco Connect Services is an independent advisory business. We do not install solar panels or charge points, we hold no installation accreditation, and we are not an OZEV authorised installer. Where installation work is appropriate it is carried out by a vetted delivery partner, and the final technical advice and the quotation sit with them. What this page does is set out the arithmetic and the settings, because those are the parts nobody selling you either product tends to dwell on.
The mismatch, stated plainly
A home charge point and a home solar array are not sized for each other, and there is no reason they should be.
Approved Document S, the building regulation covering charge points, requires a charge point installed to meet its requirements to have a minimum nominal rated output of 7kW. That is the floor, not the ceiling, and it is a continuous draw for as long as the car is charging.
A domestic roof array does not deliver a steady 7kW. It delivers whatever the sky is offering, varying minute to minute, peaking around the middle of a clear day and falling to nothing after dusk. On a bright summer afternoon a reasonably sized array on a well oriented roof may be producing a meaningful fraction of what the charger wants. On an overcast January morning it will not be close.
So the useful question is not “can my solar charge my car”. It is “what proportion of a charge can my solar realistically contribute, at the times my car is actually plugged in”. Those are different questions and only the second one has a number attached to your house.
How to find your own answer rather than ours. If you already have solar, your inverter’s app records generation by half hour. Your smart meter data, available from your supplier, records consumption the same way. Put a week of each side by side and look at the hours when the car is on the drive. That is your real answer, and it is more reliable than any figure a website can give you, including this one.
Source: Ministry of Housing, Communities and Local Government, “Infrastructure for charging electric
vehicles: Approved Document S”, 2021 edition, paragraph 6.2(b). Checked 18 August 2026.
https://www.gov.uk/government/publications/infrastructure-for-charging-electric-vehicles-approved-document-s
What happens on a cloudy day
Output falls, and it falls unevenly. Cloud does not act like a dimmer switch turned smoothly down; it moves, so generation on a broken cloudy day fluctuates sharply over short periods.
This matters more for car charging than for most household loads, because a charge point is a large load that runs for hours. A kettle does not care what a cloud is doing. A charger drawing steadily for four hours crosses many weather conditions in one session.
What a system does about that is a design choice, and it is worth understanding the three options before anyone quotes you.
- Take the shortfall from the grid. Simple, always works, and means you are part charging from imported electricity at whatever your tariff charges at that hour.
- Throttle the charge to match generation. The charge point reduces its draw as generation falls, so you only ever use your own electricity. This is what “solar matched” charging is meant to do. It works, and the cost is time: on a variable day the car charges slowly, and on a poor day it may barely charge at all.
- Buffer it with a battery. The battery smooths the fluctuation. This is the option that actually changes the answer, and it gets its own section below.
There is no correct choice among those three. There is a choice that fits how you use the car, and somebody has to ask you how you use the car before they can tell you which it is.
We cover seasonal and weather variation in more depth in solar panels on cloudy days and in winter.
What “eco mode” and “solar matched” charging actually mean
Here is something worth knowing before you compare products: those phrases are not defined anywhere in law. They are manufacturers’ names for manufacturers’ features, and two chargers using the same phrase may behave differently.
What is defined in law is smart functionality. The Electric Vehicles (Smart Charge Points) Regulations 2021 apply to private charge points sold in Great Britain for domestic or workplace use. They came into force on 30 June 2022, with the security requirements following on 30 December 2022. They do not apply to public charge points, to rapid charge points (defined in the regulations as 50 kilowatts or more), or to non-smart cables.
Under those regulations a charge point sold for private use must, among other things:
- be able to send and receive information over a communications network, and respond to signals by changing the rate at which electricity flows or the time at which it flows;
- keep working as a charger if it loses its network connection;
- keep its smart functionality if you switch electricity supplier;
- measure or calculate the electricity it imports or exports and the time it spends doing so, and make that visible to you for any session in the preceding 12 months, any month in that period, and the whole period;
- be capable of measuring its power every second and reporting it over a network.
The Department for Energy Security and Net Zero describes the purpose of the regulations as allowing charging “when there is less demand on the grid, or when more renewable electricity is available”. Note that “renewable electricity” there means the grid’s mix, not your roof. Nothing in the regulations requires a charge point to know anything about your own solar array.
That is the point worth taking away. Smart is a legal requirement. Solar aware is a product feature. If matching your own generation matters to you, it is a specific question to ask about a specific model, and the answer is not implied by the word “smart” on the box.
Sources: The Electric Vehicles (Smart Charge Points) Regulations 2021, S.I. 2021/1467, regulations 3,
5, 6, 7 and 9, as made; GOV.UK, “Regulations: electric vehicle smart charge points”, last updated
23 April 2024. Both checked 18 August 2026.
https://www.legislation.gov.uk/uksi/2021/1467/contents/made
https://www.gov.uk/guidance/regulations-electric-vehicle-smart-charge-points
The setting that quietly works against you
This is the single most useful thing on this page, and almost nobody mentions it.
The same regulations require a private charge point to arrive with pre-set default charging hours which are outside peak hours, and the regulations define peak hours as 8am to 11am and 4pm to 10pm on weekdays. So a compliant charger, out of the box, is set to charge your car outside those windows. In practice that means overnight.
Overnight is exactly when your solar panels produce nothing.
The regulations also require that you are given the opportunity, when the charge point is first used, to accept those default hours, remove them, or set different ones, and that you can change or remove them at any time afterwards. So the setting is yours to change. But it is a setting you have to know exists.
There is a second one. A compliant charge point must operate with a randomised delay of up to 600 seconds at the point charging would otherwise start or change rate, and must be capable of operating with a delay of up to 1800 seconds. You are able to cancel that delay each time. It exists to stop thousands of chargers all starting at once on the stroke of a tariff change. If you ever plug in on a sunny afternoon and nothing appears to happen for a few minutes, that is very likely what you are looking at, and it is behaving correctly.
Neither of these is a fault and neither is a reason to avoid a smart charger. They are the reason a charger installed and left on its factory settings will charge from the grid at three in the morning while your roof exports to the street at noon. Ten minutes with the app fixes it. Nobody tells you to spend the ten minutes.
Source: The Electric Vehicles (Smart Charge Points) Regulations 2021, S.I. 2021/1467, regulations
10 and 11, as made. Checked 18 August 2026.
https://www.legislation.gov.uk/uksi/2021/1467/regulation/10/made
Why a battery changes the answer
Without storage, solar charging is a scheduling problem. Your generation peaks in the middle of the day. For most households the car is not there in the middle of the day, because that is the whole reason the household owns a car.
A battery decouples the two. Generation goes into the battery during the day, the car takes it out in the evening. That is the mechanism, and it is why the question “can I charge from solar” so often turns into a battery conversation.
It is not automatically the right move. A battery is a second significant purchase, it has its own sizing questions, and the value of what it stores depends on the gap between what you pay to import and what you would have been paid to export. Which brings us to the export side.
If your solar is not charging your car and not being used in the house, it is exported. The Smart Export Guarantee, which launched on 1 January 2020 and is administered by Ofgem, requires certain electricity suppliers to pay small scale generators for low carbon electricity exported to the grid. Suppliers set their own rate, contract length and terms, and Ofgem’s own advice is to shop around. Rates must be above zero, and payments are calculated from export meter readings.
So every unit you put into the car is a unit you did not export. Whether that is a good trade depends entirely on your import tariff and your export tariff on the day, and both of those are things you can look up and we cannot. We are not going to print a number here, because a national average applied to your house is not information.
There is more on how storage actually behaves in home battery storage explained.
Source: Ofgem, “Smart Export Guarantee (SEG)”, scheme page. Checked 18 August 2026.
https://www.ofgem.gov.uk/environmental-and-social-schemes/smart-export-guarantee-seg
The part that depends on you, not on equipment
Two households with identical roofs, identical arrays and identical chargers can get completely different results from solar charging, and the difference is the driving pattern.
Solar charging works well if the car is at home during daylight for at least part of the week. Someone who works from home, drives short local trips, or has a second car, is in a good position.
Solar charging works poorly if the car leaves at eight and returns at six. In that case the roof generates while the car is elsewhere, and without storage there is nothing to be done about it.
Solar charging is somewhere in between for most people, and the answer depends on how much of your weekly mileage happens at weekends.
None of that is a hedge. It is the actual answer. Anyone who tells you what proportion of your charging will come from your roof without first asking when your car is on the drive is guessing, and the guess will be optimistic, because the optimistic version is the one that sells.
Questions worth asking before anyone quotes
- When is the car actually at home, on a normal week and at weekends?
- What does my inverter app show for generation during those hours, over a real week?
- Does the charge point model being proposed match to my own generation, and what is that feature called in its manual rather than in the sales listing?
- What are the default charging hours set to, and who is going to change them?
- What am I currently paid for export, and what do I pay to import at the hours I would be charging?
- Would a battery change the answer enough to be worth its own cost, and has anyone shown me that working both ways?
What we do and what we do not do
Eco Connect does not install solar panels, batteries or charge points, does not sell equipment, and holds no installation accreditation. We are not an OZEV authorised installer, which matters if a grant is involved: see home EV charging and what your property will actually allow.
What we can do is look at the property and the pattern with you before anything is bought, and say plainly whether the combination is likely to be worth it. Sometimes the answer is that it is not, or not yet, or not in that order. Where installation work is appropriate it is carried out by a vetted delivery partner, and the final technical advice and the quotation sit with them.
Information and source control
Information correct as of: 18 August 2026.
Regulations, schemes and export tariffs change. Every rule and figure on this page is dated and linked to the legislation.gov.uk, GOV.UK or Ofgem page it was taken from. Check the source before you rely on it.
