We have looked into this a little bit. Hashboards are 12vDC which is easy enough to produce, however is susceptible to voltage drop without very large cable. As such, most PV modules run at a higher voltage. You would need to use charge controllers that step power down from a higher voltage coming off of the PV array to 12v for a battery bank. You then need the miners to be very close to the batteries to save on copper. My assessment is that it’s doable for small scale hobby projects but not economically practical for anything you’re trying to really stack with. 48v batteries with inverters provides a more reliable solution for any kind of scale IMO