DVLA records about 5,428 privately kept plug-in vehicles across the London Borough of Sutton at the end of June 2026. A year earlier the figure was 4,264. That is a rise of about 27% in twelve months (our arithmetic). These are cars registered to private keepers, not company fleets, counted across the whole borough rather than Sutton town alone. It does not tell you how many homes have a charger, but it does tell you the conversation about plugging in at home is growing fast.
If an EV is on your drive, or coming soon, the questions about panels and a battery change. This guide covers how the three fit together on a Sutton home, what each costs, what your fuse can take, and which grants apply. For the battery basics, including where a unit goes and the grid, see our Sutton battery storage guide.
Three products, different jobs
It helps to separate what each one does:
- Solar panels make electricity during daylight. PVGIS estimates a 4 kWp south-facing array in Sutton at about 481 kWh in June, roughly 16 kWh a day. In December it is about 138 kWh, roughly 4.5 kWh a day (our arithmetic).
- A battery moves electricity from when it is cheap or plentiful to when you need it. The Energy Saving Trust suggests a typical home system might be 10 kWh and puts a 5 kWh battery at around £4,600.
- An EV charger moves a large amount of electricity into the car, at up to 7.4 kW on a typical home unit.
The mismatch is one of scale. A large car charge of 60 kWh is six times a typical home battery (our arithmetic). At the October to December 2026 price-cap unit rate of 26.32p per kWh, that charge costs about £15.79 (our arithmetic on the average capped rate). Off-peak EV tariffs price overnight units well below that.
So what should charge the car?
For most Sutton households the sensible pattern is simple:
- The car charges overnight on a cheaper tariff.
- The battery covers the house’s evening peak.
- The panels feed both during the day.
In June a 4 kWp array makes about 16 kWh on a typical day, so a car at home over a sunny weekend can take a useful share of its charge from the roof. Every new home chargepoint sold in Great Britain has had to be smart since 30 June 2022, which makes timing a charge for the cheapest hours straightforward.
Draining the house battery into the car tends to waste its capacity. You would then buy the evening’s electricity at the peak rate anyway. Our guide to what size home battery you need explains why evening use, not the car, should set the battery size.
What your fuse can take
A 7.4 kW charger draws 32 A continuously. Most homes have a 60 A, 80 A or 100 A main fuse. A charger, a battery and an electric oven running at once can add up, which is why load management matters. A current sensor on the incoming supply turns the charger down when the house is busy, and it usually avoids a supply upgrade.
UK Power Networks says it can upgrade a main fuse from 30 or 60 A to 80 or 100 A, and that a looped supply shared with a neighbour must be re-planned with both households. Your installer notifies the network about every new chargepoint and battery. Our guide to whether your fuse will take a 7 kW EV charger goes through the checks.
On the generation side, the battery’s inverter counts towards the G98 limit of 16 A (3.68 kW) per phase. Above that, a G99 approval is needed before work starts. Sutton’s town centre is in UK Power Networks’ South Eastern Power Networks area, about 2.6 km from its London Power Networks area.
VAT treats the three differently
Under HMRC’s VAT Notice 708/6, solar panels and batteries installed in homes are zero-rated until 31 March 2027, then 5% from 1 April 2027. Home EV chargers are not on that list, so a charger installation is standard-rated at 20%. If you are planning all three, ask for a quote that shows each one as a separate line so the VAT is applied correctly.
Sutton’s homes and the grants
Sutton’s housing shapes what is possible. At the 2021 Census, 27.9% of households lived in semi-detached homes, 24.5% in terraces, 10.5% in detached houses and 31.3% in purpose-built flats. Of all households, 64.4% owned their home.
- Semis in Sutton Common, Rosehill and North Cheam: a driveway charger, a battery in the garage or utility room, and panels on the roof is the simplest layout.
- Terraces: where there is no off-street parking, a driveway charger is off the table. Households with on-street parking only can get up to £500 towards a chargepoint installed with an approved cross-pavement solution, subject to the council’s rules.
- Flats: owner-occupiers and renters with private off-street or allocated parking can claim 75% of the cost, up to £500 per socket, through an OZEV-authorised installer. The freeholder’s consent usually comes first. Owner-occupiers of houses get no grant; that scheme closed in April 2022.
A standard grid-tied battery shuts down in a power cut unless backup is designed in, and it will not charge the car during a cut either.
For panels, our solar panels Sutton page covers Solar Together London and the borough’s conservation areas. For the wider area, see solar panels in South West London.
Sources: DfT and DVLA, VEH0142 licensed plug-in vehicles (2026 Q2, published 23 September 2026); PVGIS 5.3 (European Commission JRC), SARAH3 2005–2023, run 15 October 2026; Energy Saving Trust, Battery storage (updated 19 August 2026); Ofgem, energy price cap (October to December 2026); HMRC VAT Notice 708/6; GOV.UK, Changes to electric vehicle chargepoint grant schemes from 1 April 2026 (updated 7 July 2026); Electric Vehicles (Smart Charge Points) Regulations 2021; UK Power Networks, fuse upgrades and licence boundaries; ENA EREC G98 Issue 2; ONS Census 2021, TS044 and TS054 (Sutton).