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Who has a V2G EV installation

 
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Energy Storage
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Transparent
 Transparent
(@transparent)
Famed Member Moderator
Joined: 4 years ago
Posts: 3134
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.

RCDs TypeB

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

RCD type

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.

image

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 5 months ago 3 times by Transparent

Save energy... recycle electrons!


   
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Batpred
 Batpred
(@batpred)
Prominent Member Member
Joined: 1 year ago
Posts: 767
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
(@broadsman)
Estimable Member Member
Joined: 2 years ago
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
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1728
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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