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I have a kodak og plus 3.24 inverter. It's completely off grid. I have 8 x 275w solar panels, 4 x series, 2 strings in parallel. Batteries are 10 x 200ah deep cycle lead acid agm, 2 in series, 5 parallel to get 24vdc. My backup on the batteries are very weak, voltage dropping to around 23.5vdc...