I have a solar system and was doing this calculation several times, also tried other people who build solar systems and understand Bitcoin mining. if you find a way to do it without being in brutal loss, let me know. but show numbers. with current solar systems, assuming you use everything it produces over lifetime, the cost per kWh is 6-8 cents. if you want to use batteries, the price doubles. assuming a 3kW miner and 6 hours of peak sunshine (that's way overblown though), you need at least 12kWp of panels. that will not fit on most roofs anyway, but if you have a greenhouse or a parking lot, you can use that, along with let's say 3x3kWh batteries. you still have not made anything for the house, just for the miner, which also costs a lot of money and if you want to see that money back, you can't not run it, the difficulty increase will kill ROI. the professional miners get 3-4 cents per kWh and that's 24/7. just buy Bitcoin instead of the miner and use the solar system for all your other energy needs. p.s.: I have not talked about cooling. you need another 3kW AC unit to cool the miner.

You are thinking on it in the wrong way: - It's not installing solar to do home mining. - It's using home mining to consume your wasted or unused solar energy. It's not about building a mining operation in your house. It's about making more profitable your solar installation while helping the decentralization pleb-mining. So, for your opex calculation your energy costs are zero, as you are going to consume unused energy. The good old S9 has a breakeven of $0.04/kWh right now, operating in efficient power range ofc. A pair of them can chew up something between 10-15 kWh per day, that could be $0.4 or $0.5 a day. You are not going to be financially independent with that, of course!! 😊 But in a few months your (small) miner capex are paid, and your mining rewards would be 100% profits, although small! 😁 You can scale this up with newer miners adapting to your wasted energy case, or reuse the produced heat to help warming up your house. Btw, buying Bitcoin is not exclusive to home mining with wasted solar energy, of course! 🫂

This is why I mine #monero with my surplus solar. Everything better without ASICs!