Do peeps puts power wall battery banks down in their basements. In the frozen north, dont they have heated garages? Maybe you would need a sump with a steel lid to put the whole battery bank. At least the fire Dept could fill it with water. All electrical switchgear, inverters inside a steel cabinet. All important cable cutters, gloves and goggle permanently hooked on the wall.
sure take all possible and reasonable precautions. though I think if you double walled the structure with insulation between both walls and an air space separating the two your need for a/c would drop dramatically except for in the desert locations.
close to the same temps in the winter, -5f for me. I heat my batteries and it does not use that much at all, I do not heat the entire structure though, just the batteries. XPS foam battery boxes aluminum spreader plates and the heating pads. no controls what so ever just wire the pads in series spread them across the plates and let ohms law control the output for you. batteries hang out between 15°c and 25°c. no controllers, no logic circuits, raspberry Pi's or ardurino... nothing to monitor other then a temp data logger (which I no longer look at.) I have photos of the battery banks spaced across this forum specifically in ones concerning cold weather use and offgrid use.
Can it be, that the battery was 48V nominal too?
Smoke detectors are to save life, not to prevent fires.
I have a theory that a simple plant spritzer water spray is more than enough to extinguish an arc fire <48V. It takes the heat away and the arc stop ionising.
Be sure to dip your rod in wax first before testing, most hyperbaric welding is in the 300-400amp range maybe at the amperages were using the arc wouldn't sustain but I'd be inclined to think the water will just vaporise but wetting the surrounding area might prevent the arc from spreading.
I meant to extiguish the arc without human intervention.
