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Is there a recommended instant water heater that won't burn up if we give it 100F+ temps on input when the primary system don't keep up? Preferably propane, as we'd like the system to run without power on house batteries w/o having to start up the generator. Grey box center-left, after a...

Does anybody have any opinions for using UPS solar in Solar ? The batteries in setups with auto-generator start (e.g. Sol-Ark) never really get drained beyond a point determined by owner (e.g. 80%)

I have 4 strings of REC Peak Energy 72 Cell going into Sol-Ark 8k. The voltage of each panel is 45V, so string of 8 is in the vicinity of 360VDC, give or take (mostly take). I have MidNite Solar box I never installed, but apparently that only goes up to 300VDC. I'd like something in between...