Since 30 June 2022, the law has decided some of how your home charger behaves before you ever open its app. The Electric Vehicles (Smart Charge Points) Regulations 2021 require every chargepoint sold for a home in Great Britain to be smart, and to come set up to avoid the weekday peaks. For a Harpenden household weighing up its first electric car, that matters more than the brand of the wallbox.
This guide explains what the Regulations actually require, how off-peak scheduling works in practice and what it does to the cost of a charge. Fitting the charger itself, from the drive to the main fuse, is covered on our page about home EV chargers in Harpenden.
What the Regulations make a charger do
For the 6,226 privately kept plug-in vehicles DVLA counts across St Albans district, the charger at home is judged by Regulation 5. A charger has smart functionality if it can send and receive information over a communications network, respond to signals by increasing or decreasing the rate of charging or changing when it happens, use that to provide demand-side response services, and offer at least one user interface for the owner.
Two further rules shape day-to-day use. A compliant charger has to measure, every time it is used, the electricity it imports and how long for, and let you view that for each session and month over the previous 12 months. And it has to meet security requirements set out in the first Schedule. With 78.2% of Harpenden households owning their home (our sum of ONS ward figures), that 12-month log is usually yours to read, not a landlord’s. The EnSmart SmartBee-M we fit connects over WiFi or Ethernet and supports the OCPP 1.6 standard, on its published specification.
The default hours, and your right to change them
Regulation 10 defines peak hours as 8am to 11am and 4pm to 10pm on weekdays. A charger must come with pre-set default charging hours outside those peaks. When it is first used, the owner must be offered the choice to accept the pre-set hours, remove them or set different ones, and can change or remove them at any time afterwards. During the default hours, the owner must be able to override and charge anyway.
So the rule nudges rather than forbids. Plug in on an AL5 drive after the school run and a charger on its defaults will wait; tell it to charge now and it will. The exception is a charger sold with a demand-side response agreement, where that agreement’s settings apply instead.
The random delay, explained
Regulation 11 adds something most drivers never notice. At each start, a compliant charger operates with a random delay of up to 600 seconds, ten minutes, fixed afresh to the nearest second each time. The owner can cancel it, and it does not run where the owner has overridden it or the charger is providing demand-side response. The effect is that chargers set for the same start time, on an AL5 street or anywhere else, do not all switch on in the same second.
What a charge costs, and why the tariff matters most
At the Ofgem price-cap unit rate for October to December 2026, 26.32p per kWh on Direct Debit, a 60 kWh charge costs about £15.79 (our arithmetic on the average capped rate). That is the ceiling case for a Harpenden household on a standard capped tariff. Off-peak EV tariffs price overnight units well below the cap, and they are the reason default hours exist: a charger scheduled into a supplier’s cheap window turns the same 60 kWh into a smaller bill, without you remembering to plug in at midnight. Suppliers set and change those tariffs, so compare them yourself before you choose; we do not print them.
The window has to be long enough. At 7 kW, a 60 kWh battery takes around eight to nine hours from near-empty, and a 21 kWh top-up about three hours (our arithmetic). Most nights in a Harpenden household are top-ups, not full charges.
Scheduling around a Harpenden house
On our sum of the Census 2021 ward figures, 39.7% of Harpenden households live in detached houses and 78.2% own their home, so for most the schedule is the household’s own decision. Larger houses often add their own big loads, from electric showers to induction hobs. A 7 kW charger draws 32 A continuously, and load management, a current sensor on the incoming supply, turns it down while those run. Scheduling the car into the night keeps it clear of the evening cooking peak anyway.
Panels change the daytime picture. PVGIS puts a 4 kWp south-facing Harpenden roof at about 480 kWh in June, and a smart charger with a solar mode can take surplus that would otherwise be exported; in December, at about 136 kWh, the tariff does the work. Our page on solar panels in Harpenden covers the roof. Our home EV charger installation page explains charging speeds and connectors.
If your car lives on the street: the AL5 channel
Harpenden has one route most of Hertfordshire lacks. On 19 October 2026 we re-read Hertfordshire County Council’s cross-pavement channel page: the trial, run with St Albans City and District Council, is open to St Albans postcodes AL1, AL2, AL3, AL4 and AL5. AL5 is Harpenden. Hatfield’s AL9 and AL10 are outside it.
The conditions are strict and aimed at a particular group: in a town where 39.7% of households live in detached houses, the trial is for homes with no off-street space at all, such as some of the 14.0% of households in terraces. The home must have no dropped kerb, driveway or other off-street parking; the road must be council-maintained; the channel must be 2 m from trees, 10 m from junctions and 11 m from streetlights or other electrical infrastructure, and must not cross a grass verge. Assessment costs £200, non-refundable, and the county aims to decide within six weeks. Installation normally costs £1,200, including a Pavement Channel Grant subsidy. The chargepoint must be from the Government’s list of eligible models and needs planning permission from the district council, which can take up to eight weeks. The county aims to fit the channel within 12 weeks of payment, and the channel does not reserve a parking space. The national on-street grant of up to £500 can be claimed after the channel is in; our guide to who qualifies for the EV chargepoint grant explains it. Grant claims must be made through an OZEV-authorised installer; tell us your situation at the quote stage.
Smart scheduling works the same way on a channel-fed charger outside a Harpenden terrace: plug in through the channel in the evening and let the default hours, or your own, decide when the car fills.
Sources: legislation.gov.uk, The Electric Vehicles (Smart Charge Points) Regulations 2021 (S.I. 2021/1467), regulations 5, 9, 10 and 11 and Schedule 1, read 19 October 2026; Ofgem, energy price cap October to December 2026; DfT and DVLA, VEH0142 licensed plug-in vehicles, private keepers, St Albans, 2026 Q2 and 2025 Q2 (published 23 September 2026); ONS Census 2021, TS044 and TS054 categories, May 2022 wards Harpenden East, North & Rural, South and West, via the ONS Census API (our sums); European Commission JRC, PVGIS 5.3, PVGIS-SARAH3 2005–2023, 4 kWp, 35°, due south, run 15 October 2026; Hertfordshire County Council, Electric vehicle cross-pavement charging cable licence (https://www.hertfordshire.gov.uk/services/highways-roads-and-pavements/changes-to-your-road/cross-pavement-channel/cross-pavement-channel.aspx), read 19 October 2026; GOV.UK, Changes to electric vehicle chargepoint grant schemes from 1 April 2026 (updated 7 July 2026); EnSmart SmartBee-M published specification, as listed by its UK distributor.