Home Charging
Two EVs, One House: Do You Need a Second Charger?
Do you need a second EV charger for two EVs? How load balancing shares a single-phase supply, when one smart charger is enough, and what a second unit costs.
By Evova · Published
If you run two EVs from one house, you probably don’t need a second charger — at least not straight away. A single 7kW unit fills a typical 60kWh battery in just under 8 hours (Pod Point, checked July 2026), so alternating charging nights covers most two-car households comfortably. A second charger is a convenience, not a necessity — and on a normal single-phase supply, two chargers running at once will share the available power rather than each delivering the full 7kW.
The cheap answer: one charger and a schedule
Every home charge point sold in Great Britain since 30 June 2022 must be a smart charger under the Electric Vehicles (Smart Charge Points) Regulations 2021, with scheduling built in and default off-peak charging hours you can accept, change or remove. In other words, the charger you already own supports the two-car rota out of the box: plug one car in tonight, the other tomorrow, and let each charge in your cheap overnight window.
Unless both cars arrive home near-empty most days — high-mileage jobs, long commutes in both directions — alternating nights on one 7kW unit is enough for most two-EV households. Try running that pattern for a month before spending anything.
Two chargers on one single-phase supply
Most UK homes have a single-phase supply with a 60A or 100A main fuse; at 230V, a 100A supply gives roughly 23kW of capacity in total. Two 7kW chargers would nominally want around 14kW between them, on top of everything else the house is doing — which is why a second charger is installed with load balancing.
Load balancing means the two units (or one dual-socket unit) monitor demand and split the available current between the cars, then send full power to whichever car remains once the other finishes. The practical effect, per Pod Point: two cars charging simultaneously on single-phase get more like 3–3.6kW each, roughly half the rated speed. Overnight that’s usually still fine — it just isn’t two full-speed chargers.
Two other checks matter. Your installer submits the ENA connection form to your electricity network operator (DNO). Installations that keep the property’s maximum demand at or below 60A per phase can be connected first and notified within 28 days; above that, the application has to go in — and be approved — before installation. A second 7kW charger will often tip a home over that line unless load management caps the total draw. And if your home shares a service cable with next door (a looped supply, common in semis and terraces), most DNOs won’t permit a charger until the supply is unlooped, which can add real delay. The installer you choose will check your supply and consumer unit as part of the quote — find an installer or request a quote to get that assessment done properly.
Dual-socket units and what a second charger costs
A dual charger puts two sockets on one unit with the load balancing built in — tidier than two separate boxes, though dual units tend to cost more than single ones and the installation can involve more labour. Whether it beats a second standalone unit usually comes down to where the cars park relative to each other; our charger comparisons cover the current options.
On cost, there’s no honest single number for “adding a second charger” — it depends on what the first install left behind. The job involves the same ingredients as a first install, which typically runs £800–£1,200 for a 7kW unit supplied and fitted (loveelectric’s UK cost research, checked July 2026). If the consumer unit needs upgrading, that adds roughly £300–£600 more, and groundwork or a long cable run to a second parking spot pushes the quote up further still.
A second install gets cheaper when the first one left spare capacity in the consumer unit and the new charger sits near the existing route; it gets dearer when the board is full, the second parking spot is across the drive, or load-management hardware is needed. A straightforward job is still typically a single 2–4 hour visit.
Don’t count on the grant. The EV chargepoint grant — up to £500, covering 75% of the cost — is aimed at renters and flat owners, and homeowners living in houses generally don’t qualify at all. GOV.UK also excludes anyone who has already claimed the grant or its predecessors, including the old EVHS (checked July 2026). Whether a second eligible person in the same household could claim separately isn’t spelled out on GOV.UK, so don’t build a budget around it.
When three-phase enters the conversation
A three-phase supply removes the sharing problem: 100A on each of three phases gives roughly 69kVA of total capacity, and it’s the prerequisite for 22kW AC charging. But the upgrade is quote-based through your DNO, commonly runs to four figures, and can involve trenching. Before going down that road, check what your cars can actually accept — most EVs’ onboard chargers cap AC speed well below 22kW, so the headline rate is often wasted. For a two-EV household charging overnight at home, single-phase with load balancing is almost always the sensible answer.
Grant rules and typical costs change — the figures above were last checked in July 2026, and the official position on chargepoint grants is always the GOV.UK electric vehicle chargepoint grants guidance.