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Who has a V2G EV installation

AgentGeorge · 2025-07-08T12:28:58Z

Octopus are pushing their EV rental scheme, and the latest addition is their first offering of a BYD Dolphin with V2G, Vehicle to Grid, built in, it needs a wall port that will also do V2G The offer includes free charging for the year, up to 12000 miles. The EV batteries are typically 40-50kWh and upwards, thats a huge difference to the average home battery installation of 5kWh The advert says you set the minimum charge left in the EV battery you will need the next day, and the rest is made available to the grid

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Energy Storage

Last Post by Majordennisbloodnok 4 months ago

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Transparent

(@transparent)

Famed Member Moderator

Joined: 4 years ago

Posts: 3178

05/11/2025 10:10 am

Posted by: @agentgeorge

↑

What is foxing me with doing this is getting the type B rcd for CU I have, so I cant move the ASHP from its Cinch CU which has the type B in it :-/

Would that be a Chint RCD perhaps?

Have a look at this topic on high current trips, where I mention a number of potential manufacturers and suppliers for the trip being sought by BatPred.

For the benefit of others wanting to follow this discussion,
this chart shows the features found in the four types of earth leakage trip:

The majority of EV chargers are installed using a Type-A trip.

But the OVO Trial of V2G chargers five years ago showed that there was a significant DC component in the fault leakage current.
So they installed Type-B trips from then on.

Type-B RCD trips used to be very rare, and cost more than £200 each.

For a V2G charger, it would also need to be bi-directional of course.

It was usually the case that the installer needed a separate RCD and MCB.

However, we are now starting to see manufacturers responding to the market, and designing an RCBO Type-B.

This one from Proteus is also C-curve.
That means the trip-time is slower than the usual B-curve we find in domestic installations.

A C-curve is less prone to spurious tripping from switch-on surge currents

This post was modified 6 months ago 3 times by Transparent

Save energy... recycle electrons!

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Batpred

(@batpred)

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Joined: 1 year ago

Posts: 823

10/01/2026 3:37 pm

Posted by: @scalextrix

↑

Id also add to this thread that V2G (Vehicle to Grid) is not necessarily the same as V2H (Vehicle to Home). Allowing an energy provider to offtake your car charge to support the grid, wont necessarily allow you to use the car battery to run your ASHP or other home appliances.

I am wondering if in any V2X, would the car battery ever send DC to the EV plug or always AC?

And what happens when a V2X car is plugged into a recent EV charger not designed for it, does it just not work or can it cause any issues if the car attempts to export?

8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC

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Broadsman

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Posts: 76

20/01/2026 1:06 pm

@majordennisbloodnok. I have been considering a Volkswagen ID 3/4/5, or Skoda Elroque, as the back up to my Tesla Powerwall 3 which ran out of juice during the recent cold snap.

As I understand it, all these cars are ready for V2H. Is that correct and are you using V2H?

I know that a special bi-directional charger is needed, but also that the Zaptec Go2 is available. None of this makes any sense financially for me, but I just like the idea of getting all my electricity at 7p pKwh. I wonder how long it will be before the 7p is increased substantially.

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Majordennisbloodnok

(@majordennisbloodnok)

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Joined: 4 years ago

Posts: 1765

20/01/2026 1:15 pm

@broadsman, yes-ish and no.

We bought our ID3 secondhand because it ticked too many boxes at the right time. We were interested in the V2X concept and I looked seriously at it when I saw VW were releasing an over-the-air upgrade to make all models after a certain date V2X-compatible. However, for the ID3 that was only on the 77kWh models and ours is a 58kWh, so no we're not using it. However, I have little doubt that our next purchase will be another VW stable car and that'll need to have a longer range so we can visit family, so V2X is already in our future upgrade plans.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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