The Rolls batteries have no issue, but i’m worried about the overall weight. I’ve seen a bit of separation between the caulking and the seam on the side wall adjacent to the front storage compartment (but no other obvious signs of an excessive weight in that area).
I’m in Canada and saw the warnings above usability below 0C, I could further insulate that area,, or even move the batteries and inverter inside to mitigate that issue, but I don’t think i’d go to the extent of adding a heater.
I’ve done some research on the BattleBorns with Solarcity, the company I bought the Rolls units from (TotalBattery) carries a brand called Relion.
I don’t think I can up the voltage on the battery bank with the Samlex 3012 (haven’t installed it yet), so i’d be sticking with a 12v setup.