I have 4 x 100ah Gel bateries connected in series to produce 48v supply to my Growatt spf5000es 5kw inverter, I know everyone says gel batteries won’t last, but I have just started using them running my fridge and a light, charge does not last more than 45 mins, I would have thought 100ah could provide enough charge to run a ceiling fan a light and fridge for 2 hours, welcome any comments