Ok, GPU cards and host PCs need 12V dc. This already removes the need for DC-AC inverter and saves you about 20% on your battery and solar size required due to removing inverter and PSU losses. I guess you have multiple GPU rigs. Try converting one to DC supply and solar. You can get away without battery by feeding output of solar charge controller directly to 12V dc bus together with grid powered power supply in parallel. This way it becomes effectively grid supported but partially solar powered mining rig. But you can only offset <50% of energy usage that way. Going with battery will not save you much money and requires large up front investment. Your best bet is to try going DIY permited AC grid-tie solar with interconnect agreement if you can get 1:1 net metering. Storing and discharging 1kWh of energy in cheapest DIY LFP battery will require $200+ investment and will provide 1 - 3k equivalent cycles depending how lucky you get with your battery supplier. That comes out to 6.7 - 20 cents per kWh battery stored energy cost. If you have full net metering then you get "free" battery from the grid.