Hi, I have a rather primitive cabin in the mountains at 60 degree North. Today its equiped with a very limited 12v solarpowered electrical system. I have started to dream about installing a Powerwall 2 to give 230v to the cabin. Is this feasible? What is required from the solar panels to charge the Powerwall? it dosent need to charge more than about 1/5 of the Powerwall each day.