[bitL]

2000Wh power station can be had for <$2k and 2000W solar panels for ~$2k. 3090s don't really consume 500W, more like 350W and that assumes regular voltages; in reality for mining it's much lower. 3080Ti would be even cheaper for about the same throughput.

[gambiting]

Yeah but you have the rest of the system to account for. And you need more than just what the system uses to charge the battery storage for overnight use - probably 4000W of panels if not 6kW. The batteries are the most expensive part of this(unless you only want to run the system for few hours during the day, but then what's the point?). You mentioned a 2000Wh power station, but I'm not sure how that helps? That will only store enough energy for an hour of running at most. So yeah, you're looking at about £15k for the whole power system alone.