Correct. One is effectively playing the market.
The question is though, how long do the cheap rates apply and how quick is the payback. I don't see even night rates getting anywhere near day rates in the next couple of years, by which time they will have paid off. Having solar storage rather than either sending it back to the grid or sticking it into hot water also benefits anyway. Like all these things one has to 1) get in early, and 2) be able to spend on them.
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