The battery in an EV is a multiple of a usual home battery – the idea of using it for the house is obvious. Today, three things of that actually work: surplus charging for everyone, the V2L device socket on many models, and genuine V2H for early adopters with the right system package. What's still missing is a standard solution for everyone. Anyone who knows the stages gets today's benefit without betting on tomorrow. (As of: July 2026)
Key points in brief
- Stage 1 is open to everyone: surplus charging shifts solar power into the car – no feed-back needed, full benefit when driving.
- Stage 2 delivers power from the car to devices (V2L) – handy, but not a home battery.
- Stage 3, genuine V2H, exists as a system package for early adopters – with a matching vehicle, special hardware and consulting effort.
- The structural snag remains: a car that drives off in the morning isn't a reliable battery in the evening – the standing-time profile decides.
- The home-battery question is calculated today independently of the car – V2H is the option on top.
Why is the idea so tempting – and where does it really stand?
The numbers speak for the idea: a battery stands in the driveway that holds a multiple of what usual home batteries in the basement offer – already paid for, with the car purchase. Tapping it at night and on overcast days for the house would perfectly complement the solar system. That's exactly what V2H, vehicle-to-home, promises.
The honest status check: the promise is real, the route there for the standard household isn't fully built yet. Why vehicles, wallboxes and rules don't yet work together across the board is explained in the technical article. Here it's about the practical question: what of this can you already use today? The answer has three stages – and the first is regularly skipped, even though it brings the biggest everyday benefit.
Stage 1: surplus charging – "storage light" for everyone
Anyone with spare solar power doesn't necessarily need to be able to draw it back out – it's often enough to push it into the right battery at the right time. That's exactly what surplus charging does: the wallbox preferentially charges the car when the roof delivers more than the house needs. Economically, the effect is the same mechanism that makes a home battery attractive – self-consumption instead of feed-in – except that the "battery" has four wheels and the electricity is used as driving energy instead of being fed back.
That's feasible today with standard technology, needs neither a special vehicle nor a special permit, and pays off via the difference between the feed-in tariff and the cost of driving electricity. Anyone who wants V2H but is planning today: this stage is the foundation – and stays the foundation even when genuine feed-back is added later.
Stage 2: V2L – the socket on the car
Many newer models offer vehicle-to-load: a socket on or in the vehicle that powers devices – the drill in the garden, the cool box, in a pinch even more. That's practical and underrated in everyday life, but not a home battery: V2L isn't connected to the house network, doesn't supply permanently installed consumers, and doesn't replace a backup-power solution for the building.
Still, the stage serves as an anchor for expectations: it shows that the vehicle battery can, in principle, give power back – the hurdle isn't the battery, it's the clean connection to the house.
Stage 3: genuine V2H – today a pioneer project
They exist in Switzerland, the households whose car supplies the house in the evening – with a system package of a feed-back-capable vehicle, matching charging hardware and professional integration into the house network. Anyone who wants to be one of them should bring three things: a vehicle (model) that properly supports feed-back including its warranty terms; the willingness to invest in a still-young system package; and a specialist company that plans integration, metering and utility registration in from the start.
| Stage | Benefit | Effort | Who it's for today |
|---|---|---|---|
| Surplus charging | Solar power becomes driving power | Wallbox with PV control | practically everyone with PV + an EV |
| V2L | power for devices on the go/in the garden | a vehicle function, no conversion | anyone driving a model with V2L |
| Genuine V2H | the car supplies the house | system package + specialist planning | early adopters with a matching vehicle |
Classification, as of: July 2026. The market is moving – the specific product and warranty information is decisive.
The awkward point: is the car there when the house needs it?
The technology question will become solvable – the logistics question remains. A battery is useful in the evening and at night; exactly then the car has to be home and sufficiently charged. With a commuter profile, the "home battery" drives off in the morning and comes back partly discharged; V2H reliably contributes little there. The other way round with a home-office or second-car profile: lots of standing time at your own wallbox is the same profile that already wins with solar charging – and it also makes V2H valuable.
The consequence for planning is the same as with the battery-or-not question: the standing-time profile decides, not the data sheet. Anyone who honestly looks at their own profile knows pretty precisely whether V2H would ever be more than a nice feature for them.
How do you plan sensibly today?
First: calculate the home-battery question independently – if it's worthwhile, then now, regardless of the car; the bidirectional car is an option, not the basis. Second: implement stage 1 now – surplus charging captures the available benefit with today's technology. Third: at your next vehicle purchase, factor in feed-back capability and its warranty terms as a criterion, without an expensive gamble. Fourth: keep expectations about backup power sober – supplying a house during a grid outage is its own chapter with its own technology, which neither V2L nor the standard V2H package automatically covers.
The V2H question mainly comes from technically minded clients – and the best advice starts with the profile question: "Where is your car on a normal Tuesday at 7pm?" Anyone who answers "in the driveway" gets the staged solution from us: surplus charging today, infrastructure that's expandable, the vehicle feed-back-capable at the next change. Anyone who answers "out and about" is spared the investment in a battery that's never there when it's needed.
Frequently asked questions
Can my EV supply the house during a power outage?
Only with a system designed for it – disconnecting from the grid and supplying fixed consumers needs its own technology, as with backup-power solutions using a home battery too. V2L at the car socket bridges individual devices, not the building.
How much storage is in an EV compared with a home battery?
As an order of magnitude: a multiple. The vehicle battery is among the largest batteries in the household – exactly why the V2H idea is so persistently appealing.
Does V2H damage the car battery?
It means extra cycles; modern batteries are designed for high throughput. What's decisive is the manufacturer's warranty terms – they govern whether and how feed-back operation is covered. Check before using it.
I already have a home battery – do I still need V2H?
Rarely. Both fulfil the same function; coordinating two batteries needs managing. The division of labour usually makes more sense: the home battery covers the evening, the car charges surplus for driving.
Does fed-back car electricity count as solar power?
Not automatically – in the battery, whatever was charged mixes together, and separate rules apply for remuneration and origin. For details: bidirectional charging – status and rules.
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Swissolar-certified specialist company · ESTI installation authorisation (Art. 14 NIV) · in Zurich since 2017 · over 150 systems completed · a personal answer from the specialist company, no call centre
Sources: EnergieSchweiz (bidirectional charging, e-mobility), manufacturer documentation, ecoEn GmbH's planning practice.
Last updated: 9 July 2026 · Author: ecoEn editorial team
