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@Dammit
I've been chatting to a customer support/technical chap at a solar panel supply place and he says that you need to be careful as the inverters frequently take more power in standby than a panel can output during winter:
"As you can see from this table, for five months of the year a solar panel of this size would not be able to even keep the inverter turned on with no load for 24 hours a day ".
Now, there is a solar system offered by Hormann which runs at 24v and doesn't require an inverter, which looks like it might make more sense in some ways - but then I have no power for lights, or indeed anything else.