They put batteries for night.
The thing is that they need 50k investment for solars panel, batteries and one miner s21.
They say they will refund the full amount of money after 1 year due to irs.
If your country has such a program from the IRS, why don't you contact them for advice?
I don't see any economic sense in such investments. Miners use solar energy during the day, and at night they buy it from energy companies.