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Or you can by a car instead. An MG4 costs less than 20000 euros with a 51kWh LFP battery. In addition to a good battery, it's a great car as well.

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afaik it doesn't support bidirectional charging, I'd much rather cycle my standalone lifepo4 bank than my EV battery

Yes, it does. I haven't tried it as a do not have the cable for it, but the user interface for discharge is there and the manual also talks about this feature.

It's probably not ideal for running a full house (as it would require some other electronics and installations), but a couple of appliances should work.

There are several types of bidirectional EV charging, the one most cars has is about a 1kW fused connection called "Vehicle to Load (V2L)" but the one you are discussing is what they call "Vehicle to Grid (V2G)" and in those cars it supports the full input and output of the vehicle inverter.

In germany was (still is) illegal to use the car as battery… it is going to change soon though

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