If you are using an inverter that doubles as a charger and an UPS, fit a normal RCD on the supply side and the RVD on the output side of the inverter. Tell Ian at RVD Safe that I recommended him as a supplier of these great devices .... shouldn't push the price up too much We often went head to head on the Caravanner forum before I got banned and he possibly quite, but we remained friends away from the forum. I think his name over there was Powerstream .... but a good bloke anyway. Be sure to tell him what output inverter you intend to use because they come in different output sizes, and you want one that will protect against reverse polarity as well.
T1 Terry
A person may fail many times, they only become a failure when they blame someone else John Burrows
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves