[BruceH]

I was reading the user manual for the VW ID.7 I've on order (yes, sad I know), this supports V2G (via a HagerEnergy CCS home unit initially, will likely be some time before this becomes mainstream I imagine). VW have limits built-in for V2G usage, presumably to protect against battery warranty claims or similar? 4000 hours of usage or 10MWh energy and that's your lot, for a net 77kWh battery charging between 20-80% that equates to 216 full cycles if my maths is right. Appropriate page below:

 

[BruceH]

I can't quite make out if that V2G limit is an absolute or if it's only a limit to bidirectional charging managed by the car system?
Is the ID7 compatible with the Wallbox Quasar 2 ?

I think it's such early days that we can only guess, but I would assume it's an absolutely limit fixed by VW. Perhaps you could go to the dealer after you hit the limit and they might extend it for you, with some kind of battery analysis or some kind of waiver on your part. Who knows. Will likely be a few years before this matures in any kind of volume way.

Re Quasar 2, Kia have chosen this IIRC as their partner for initial V2G launching with EV9. Will it work with VW? In theory you'd hope there would be general compatibility across brands, after all it's an agreed standard... in practice I would expect a re-run of the CCS incompatibility blame game that was witnessed when CCS rapid chargers were first launched...