Guy rang me yesterday, He wants to plug his EV in and charge it overnight at his static caravan. He only has a 2OA supply: that's fine he can in theory plug in via a 13A socket and trickle charge. What he wants/needs is some sort of management system that will turn off his charger if he turns on say kettle and toaster first thing; I don't even know if this sort of thing is available, I would think it would have to be installed at the CU and won't be cheap. I think I'm going to tell him he needs to speak to a registered EV point installer, as (before I even look) there's probably all sorts of issues here with liability, and additional earthing requirement/ RCD issues, but any thoughts? It''s an interesting and not unreasonable question, and i guess likely to be commonplace in the future. You have a static: how do you charge your car when you're there?
- the sort I linked to have 4 terminals, 2 for a sensing coil - you might put that in series with the live supply to the socket that feeds the kitchen for the toaster, kettle etc. and 2 that are just a switching contact, like a relay.
When the current in the sense coil exceeds 16 amps in in this example the contacts change state, and do not reset until the current in the sense coil falls below some lower value, perhaps 8 or 10 amps for this specific device, but ones with other preset or adjustable limits exist. This is your 'kettle or toaster detector'
The contacts you use via a relay or contactor or whatever to wind down the charge in some way (or in the continental house to disconnect the water heater or whatever discretionary load is to be shed while the kettle boils.)
A dedicated unit as implied by Matt:e is probably far better, but you'd need something that can interface with your chosen make of charger and cable.
- the sort I linked to have 4 terminals, 2 for a sensing coil - you might put that in series with the live supply to the socket that feeds the kitchen for the toaster, kettle etc. and 2 that are just a switching contact, like a relay.
When the current in the sense coil exceeds 16 amps in in this example the contacts change state, and do not reset until the current in the sense coil falls below some lower value, perhaps 8 or 10 amps for this specific device, but ones with other preset or adjustable limits exist. This is your 'kettle or toaster detector'
The contacts you use via a relay or contactor or whatever to wind down the charge in some way (or in the continental house to disconnect the water heater or whatever discretionary load is to be shed while the kettle boils.)
A dedicated unit as implied by Matt:e is probably far better, but you'd need something that can interface with your chosen make of charger and cable.
