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So I posted this to show TTT how to configure your multiplus to use an input (in this case the temperature input) to tell it to connect or disconnect AC. You can then use your BMV relay to control the multiplus.

But then I realised, in all our bickering about the greatness/oldness of inverters, I had completely missed just how wonderful the assistant stack is. I don't know any other inverter on the market with this level of programmability. Yes, perhaps overkill for the average home user. I'm not the average home user though :-)

But then, the trained installer, who knows his stuff, can program the Inverter, remotely via software access to your Pc, exactly as you want it.

So that is not a problem at all for the novice user.