As a new BYD Shark 6 owner, I am particularly interested to learn whether it is possible to use V2L to power home essential loads during a blackout using a manual transfer switch installed adjacent to the main distribution enclosure. Licenced electricians I have contacted appear disinterested suggesting to just “use extension leads”. Ideally, I would prefer a permanent arrangement for those rare blackout occasions whereby just a single extension lead from the Shark 6 240Vac adapter box could supply power to a permanently installed 15A input plug, then connected to a manual transfer (changeover) switch. When switched to grid mode, power is directed normally from the grid, and in blackout, the switch can be manually selected to power form the vehicle. Ideally, I would like to select two existing circuits (one for essential LED lighting & smoke detectors and the other being a power circuit that incorporates the fridge and water pump (no town water here), to then divert via the transfer switch perhaps to a newly installed sub-board with separate RCBO for each of the two circuits. However, I have read articles suggesting there may be difficulties with domestic Earth/Neutral and MEN issues with a possible work-around by using a multiple-pole manual transfer switch. Obviously, if all possible and legally compliant, to be installed by a fully licenced electrician. Once switched to V2L, care would be required not to overload and to ensure sufficient charge is always available within the Shark battery. This option or similar, if viable, may well prove to be a relatively economical solution providing a good source of back-up power?
You are on the right track. You can use a double-pole transfer switch to isolate and power a few selected essential circuits in a separate sub-board. In Australian, the MEN link must always remain connected in the Main switchboard (it cannot be removed for any reason).
In normal operation, with the transfer switch in the grid input position, the backup circuit active & neutral will be connected to the main neutral and the RCBOs will work. When the switch is turned to the V2L position, the active and neutral will be connected to the EV supply. Now you will have a floating system, much like a backup generator.
One issue which can occur with this situation is nuisance tripping of the RCBO as the vehicle has a safety earth-fault detection as well. I have not tested this exact scenario to see how reliable it is.
Search for Ecohouse Thailand on Youtube, this guy has a BYD Seal in use to power his House and made a Video from. May be that will help you.
Just for my Intrest, do you have 1 phase or 3 phase Power Supply?
Interesting videos, thanks. I have single phase power from the grid and 8.5kW of grid connected enphase microinverters on the rooftop PV array. No other battery setup.