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If the system genuinely runs of dc side then it would seem to be suitable for off grid providing you don’t draw more ac then it provides. That probably means lots of panels. I currently have two large Pannel’s rated at about 35v and 350w each so I’m limited to what I can pump into it. There’s...

I have the same issue with my sb3300. Nothing happens when I plug in ac power but if I connect 70v dc to the over side I get all three lights coming on and staying on. It might be that the electronics are run from the dc side and the capacitors are used to store some power to run the system...