Same here in MD - no code issues here with locating them in the utility room.
Many jurisdictions are still fine with them in utility spaces, coming next year there will be a 40 kWh rating maximum, so only 2 Powerwalls can go in interior locations, except the garage, which will have an 80 kWh limit just like outdoor locations, 80 kWh maximum.
If you want it in an interior space, I recommend permitting it before the codes change. All of California is getting an update to the ESS codes between January 1 and July 1, and these new maximums will be in force.[/
What about 3 PWs in an enclosed furnace room (in basement)? My install is probably around June so hopefully no issues with code.
I talked about this extensively with my installer as I can either put them on a north facing exterior wall or an interior garage wall (though the interior wall would require some work to relocate built-in shelving and some other minor inconvenience).
In the end, with their reassurance, I decided theyll be fine and will put them outside on the North wall.
You have to figure that the round trip losses (~10%) turn into heat, so you can guesstimate the added heat.I have the reverse question... if mounting powerwalls in any enclosed space, how much heat do they generate that would add to any conditioning requirements in the space?
For example, we have an unconditioned garage. It would often be more temperate than outdoors, but if we mounted 4 powerwalls and they give off heat, the space could be hotter than outdoors in summer, depending on their heat generation.
You have to figure that the round trip losses (~10%) turn into heat, so you can guesstimate the added heat.
You can get an attic or gable fan and hook it up to a solar water heater controller to turn on whenever the garage is warmer than the outside. They use two temperature measuring probes, one inside an one outside.
All the best,