Me like.
I was already thinking sand battery at "Then grow the system for resistive loads. (heating)".
Jack Rikard had a concept called Selfish Solar, were you have a grid connection for backup, but don't feed back into it.
https://www.evtv.me/stories/selfishly-solar-9582ee39
Quote:
What I would propose is a bit different type of solar system I term “Selfish Solar”. This is a solar system you build for you and your house. It IS connected to the grid. But kind of as a backstop/supplement. We would use the grid if necessary. But we never give or sell back to it. And the concept is to pay the monthly minimum connection fee and not use any of their electricity at all.
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It fits nicely with your scenario.