I'm not right up on power pricing & structure in your area but here's an idea to try maximise ur power & save money..
First i dont know how long it takes to fill a telsa battery so please take that into consideration.
Do u have on peak or off peak power available to u?
U could buy enough battery packs to charge using grid power in off peak times so that u could run them all the time & even mix them up with some solar panels to reduce that cost
Only want 1 battery cause 7kWh battery should be enough for house consumption.
Two prices
annual (euro): 92,92
Price kWh peak (euro-cent kWh): 11,54
Price per kWh off peak (euro-cent kWh): 5,25
Only night
Price kWh (euro-cent kWh): 4,45
Setup:
At night => battery loads and miners run on 0.0445 €/kWh
At day => miners run on battery + solar panels 0.0445 €/kWh or less
I asked for more specifications on battery but no reply yet.
Yes indeed you could couple more battery's
Thank you for your comment