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Because I would like to sleep with a good feeling and without fear of fire (the components are on the wall to our master bedroom), I took very good caution to ground everything with separate wires (cases, wireways, conduits, boxes, etc.). For safety, I've also installed disconnect relays and contactors between the battery racks and the AIO's, between the grid and the AC-in's and a module level PVRSS (via Tigo TS4-A-2F) and they will disconnect if one of the smoke detector will be triggered.
Better be prepared!
Perfect. Also just having them mounted on cement backer board or drywall to be safe.
Some people have components in their garage on plywood which is flammable.