If you buy a home charger for a Carshalton drive today, it will be a smart charger whether you ask for one or not. Since 30 June 2022 the Electric Vehicles (Smart Charge Points) Regulations 2021 have required every new home chargepoint sold in Great Britain to be smart, and they set out in some detail what that means. This guide explains those rules in plain terms and what they mean for charging off-peak in SM5. For the installation itself, see our page on Carshalton EV charger installation.
Across Sutton, DVLA records 5,428 privately kept plug-in vehicles at the end of June 2026, up from 4,264 a year earlier, so a good number of Carshalton households are setting up a charging schedule for the first time. The default settings are a sensible starting point, but they are only defaults.
What the 2021 rules make every charger do
The regulations, read on legislation.gov.uk, set five requirements that matter for a charger on a Carshalton drive.
- Smart functionality (regulation 5): the charger must be able to send and receive information over a communications network, and respond to signals by increasing or decreasing the rate of charging.
- Keeps charging offline (regulation 7): if it loses that connection, it must remain capable of charging the car.
- Measuring (regulation 9): each time it is used, it measures the electricity it imports and for how long, and lets the owner view that information.
- Default hours outside peaks (regulation 10): it must come with pre-set default charging hours outside peak hours, which the regulations define as 8am to 11am and 4pm to 10pm on weekdays.
- Randomised delay (regulation 11): at the relevant times it operates with a delay of up to 600 seconds, which the owner can cancel.
For a Carshalton commuter who gets home at six, the 4pm to 10pm weekday peak is exactly when the car arrives, which is why the default is to wait.
You set the schedule, not the charger
Regulation 10 also gives the owner control. When the charger is first used, you must be given the opportunity to accept the pre-set hours, remove them, or set different ones, and you can change or remove them at any time afterwards. So the defaults are a starting point for a household in the Beeches or on the St Helier estate, not a lock.
In practice the useful setting is the one that matches your electricity tariff. Many EV tariffs have a cheaper overnight window, and the charger’s schedule should line up with it. We do not quote supplier tariff rates, because they vary and change; check your own tariff’s off-peak hours and set the charger to them. Some tariffs may instead manage the timing remotely, using the smart functionality above; if yours does, follow its set-up instructions.
What one charge costs at the price cap
To give a sense of scale, the Ofgem price-cap unit rate for October to December 2026 is 26.32p per kWh by Direct Debit. At that average capped rate, putting 60 kWh into a car costs about £15.79 (our arithmetic). Off-peak EV tariffs price overnight units well below that, which is the whole point of scheduling: the same Carshalton car, charged in the cheap window, costs noticeably less to fill. The exact figure depends on your tariff and your car.
The randomised delay, and why it exists
The delay surprises people. The charger is plugged in, the cheap period starts, and nothing happens for a few minutes. Regulation 11 requires a delay of up to 600 seconds at the relevant times, so that cars across Sutton and the rest of the network do not all begin drawing power at the same moment. It protects the local network rather than your bill, and the owner is able to cancel it.
That network is UK Power Networks’. Carshalton’s town centre sits in its South Eastern Power Networks area, about 2.4 km from its London Power Networks boundary, so check your postcode with UKPN if it matters. Either way, the installer notifies UKPN of the new chargepoint.
Signal and siting on a Carshalton home
Smart features need a connection. The EnSmart SmartBee-M we fit connects over WiFi or Ethernet and supports OCPP 1.6, an open charge point communication protocol. On a Carshalton Beeches semi with the charger at the end of a side drive, the home WiFi may be weak by the time it reaches the wall, and an Ethernet run is worth discussing at the survey. Because the charger keeps charging if the connection drops, a weak signal costs you app control, not a charged car.
The supply matters too. A 7 kW charger draws 32 A continuously and household main fuses are commonly 60 A, 80 A or 100 A. Load management uses the same smart functionality to turn the charger down while the house is busy, which usually avoids an upgrade. Our home EV charger installation page covers the kit and the survey.
Solar, a battery, and the schedule
If you have panels, the schedule can work the other way round: with a compatible set-up, surplus daytime solar can go into the car rather than being exported. PVGIS puts a 4 kWp south-facing array in Carshalton at about 481 kWh in June and about 138 kWh in December, so that is mainly a summer gain. Our page on solar panels in Carshalton covers the roof side, and our earlier guide on how an EV, a battery and solar fit together in Carshalton covers the three as a set.
VAT and grants
A home charger carries 20% VAT. Owner-occupiers of houses, who are 80.7% of households in Carshalton South & Clockhouse at Census 2021, get no grant. Renters, and people who own and live in a flat, can get 75% of the cost up to £500 per socket with private off-street or allocated parking; The Wrythe is 29.9% purpose-built flats. Our guide to who qualifies for the EV chargepoint grant has the detail. Claims must be made through an OZEV-authorised installer, so tell us your situation at the quote stage, through our contact page or on 0204 547 1892.
Sources: The Electric Vehicles (Smart Charge Points) Regulations 2021 (S.I. 2021/1467), regulations 1, 2, 5, 7, 9, 10 and 11 (https://www.legislation.gov.uk/uksi/2021/1467/made), read 19 October 2026; Ofgem, energy price cap unit rate, October to December 2026 (Direct Debit); DfT and DVLA, VEH0142 licensed plug-in vehicles by keepership and local authority, Sutton, 2026 Q2 and 2025 Q2 (published 23 September 2026); UK Power Networks Open Data Portal, licence boundaries (December 2024); European Commission JRC, PVGIS 5.3, Carshalton, run 15 October 2026; ONS Census 2021, TS044 and TS054, Carshalton South & Clockhouse and The Wrythe wards (Nomis); GOV.UK, Changes to electric vehicle chargepoint grant schemes from 1 April 2026 (updated 7 July 2026); HMRC, VAT Notice 708/6; EnSmart SmartBee-M published specification. The per-charge cost is our arithmetic.