Battery bms
I had a problem which I thought had gone away, first of all from April till October everything is working OK, when we approach winter it comes back.. my system is 4.4kw of panels, 3.6kwh inverter and 4x5.12 of batteries, if I was to charge the with a smart tariff everything would be OK... the problem I've got is that two or three days of poor weather and I end up with across all four batteries I end up with a difference of 30%, (7% to 40%) and the bms tries to recover the low battery but chargers all four the same till the low battery is above 15% then back to normal, thenas the batteries discharge into the house the problem starts again
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On the inverter go to the timer settings screen, set the time you want to start and end charging, for example "time period 1", start at 0000 and end at 0700 (or whatever times your cheap rate starts and ends), set percentage charge to 100% (or less if you just want to top them up a bit), tick the "grid charge" box, tick the "use timer" box. All other time slots should be set to 20% (for 80% DOD) or 10% (for 90% DOD) without ticking the "grid charge" box. Press the "OK" button. Press the "back" button then go back into the page to check the settings have taken. It is not a good idea to discharge your batteries down to zero %. Make sure your start time for period one and end time for period six are set to 0000 (midnight to midnight). It is not advisable to have time slots spanning midnight. Some people do it for specific reasons (mainly to do with EV charging at cheap rates), but generally it is neither recommended nor necessary.