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How much is the electricity cost from the grid approximately?
About 50% higher from the profitability threshold. E.g. if profitability requires less than 0.10 price, then the current price is about 0.15.
Sell excess energy back to the grid.
I would like to avoid that as it would require involving the grid operator with tons of paperwork and they would buy it at a ridiculously low price.
some efficient miners ... and some less efficient
Hmm, I will look at the numbers and will consider that. Thanks for the idea.
Tweak the miners frequency to underclock
There are also some miners that support changing the power, e.g. mine at P watts, 1.5xP and 2xP watts. They surely cost as a "2xP watts" miner. In the winter it would be possible to reduce the power, but that wouldn't change much: lets say it waits 3 days for the battery to charge, then it starts and if it mines at 2xP it will drain the battery for 10 hours, if it mines at P then it will drain the battery for 20 hours. Then wait 3 days again for the battery to fill up. I think it wouldn't make any difference whether it works for 10 hours at full power or 20 hours at half power.
this territory is moderated
Then it might be the case that it's not a good idea, if your main motivation is to do it as an investment.
Solar is great as a complement but not as the only source. Even with batteries you won't be able to preserve energy for the winter. And the batteries cost and wear can be significant even if only for the nights.
This might be interesting for you as well: https://smokinghopium.io/
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