Connecting a V2L car to a house as a battery.

[Jonny2300]

The v2l cable would be wired into change over switch. It's not in currently as I had to revert to extension lead. It enters bottom right. Switch handle obscures CAR label. No MCBs trip on consumer unit. Box on bottom right is RCD for Zappi charger.

When change over switch is operated for car input the feed is live to consumer board....right up until I flip master RCD to connect to home then car cuts supply.