I have built a 5kva system multiplus 48volt 5000w/70 inverter with a mppt 150/35 battery charge controller & a bvm702 monitor with colour screen. Running 4 12volt 200ah deep cycle battery's connected to 6 250w panels. At 100% battery power I can only run a domestic fridge for 8 hrs before I get a low battery alarm. I should be getting longer times from the battery's. How do I reconfigure the settings and synchronisation on the system.