Yes. Batteries are inherently bidirectional. "All" you need is to turn on the contactors. I believe that there are various tricks; I haven't looked into it.
I'd say it's not practical. The trivial way is to add a resistor in series, but it will have to dissipate massive power, and all that power is lost unless you harness it to heat somewhere cold.
Some inverters can already take the V2L output and happily switch it through to the load, use it to charge a battery, or both. Some can also blend AC-in power with solar power, meaning that you can use solar power in preference to battery power or AC-in power. It will be thinking of V2L power as utility power, and often you want to minimise the use of that.
Exactly. Looks like it's Duplex not Duo, thanks. I'll go edit.
www.aliexpress.com
I assume that these inverters would use the AC output from the car in island mode, disconnecting the house from the grid? If it was possible to take the AC output from the car, convert it to DC and then feed this into a hybrid inverter (DC voltage level from converter matched to DC input of hybrid inverter) in order to overcome the issues of additional earthing requirements, but also allowing the hybrid inverter to produce an AC output that is synced to the grid in order to power the house.
I believe so. They all seem to monitor the grid input and disconnect when it's out of specification, including of course not present at all.
I don't see that as practical, and the earthing issue could be solved either by the inverter and appropriate settings, or by earthing neutral from the V2L at the inverter's generator input. The house should have a good earth connection, since it's a bad idea to rely on the grid's earth when the power is down. The fallen tree that chopped the power probably chopped the earth connection as well.
Being able to synchronise with the grid is a great feature, since you can support the house load without fear of overloading the V2L system, and even make money exporting to the grid at times of very high demand. Usually that would require the car to be V2G capable, but yes if an efficient way could be found to feed DC from the car to the house inverter, then in many cases the house inverter could do the synchronisation.
You might do that but it's likely none of the rest of the V2L adapter has been built to handle such current. You need the appropriate terminals, wires etc before pushing more current through than it is designed for.
i can always find an certified electrician to mod it, changing all to the necessary cables etc that can handle 32amp. but it would be just a convenience to just buy 1 off the shelf.
I suspect it would need to be custom made.
That should be easy to find, since many on-board chargers are capable of handling 32 A. The fact that the power will be flowing in the other direction doesn't affect the current rating of the contacts, cable, etc.
That's unlikely, because MG for whatever reason decided to make the V2L official rating only about 16 A. Others have found that they can make 32 A flow, but that doesn't mean that the cooling etc is adequate to sustain that current continuously, or for any particular load factor.
I am not particularly interested to use the car as an off-grid emergency backup supply - we have only had only 2 or 3 (usually brief) power outages in our area in the past 30 years. However, being able to use the 64kWh battery of the car to power the house is appealing as a very efficient and economic alternative to buying a separate house battery.
Without an expensive dedicated bidirectional controller, it won't be particularly practical.
So when is the car actually used as a car?
I guess I'm not following your plan. Help me understand what I'm missing.
My main usage will be to power a heat pump, where the main demand is in the wintertime when the power I get from my 3kW solar panels is often <<1kW. Re-charging the car batteries will be overnight, when cheaper grid power, which will also be powering the heat pump. I might expect to use 8-10 kWh for the heat pump on a cold day (a COP of 3-4 provides 25-40 kWh of heat energy). I tend to use the car only 1-2 short trips a day, so most of the time it can be supplying the home.
