yeah I had moved it down to 27.3 because of a suggestion from IAN regarding his thought that the BMS was tripping out. so this lower setting was a "test" value while we give the unit some headroom to prove it wasn't tripping the bms and resetting the unit. (which I might add I use overkill solar bms's and monitor through an ipad and so no evidence of it tripping) but...well... trying anyhting to get this figured outIf you want to increase PV production/energy harvest you might try setting 5 to USE, 19 to 28.5 (3.55v/cell) and setting 20 to 27.5. I don't think this will prevent the Growatt from turning off at the end of the absorption charge but you will be pushing battery voltage higher and away from the flatter part of the charging curve so voltage will drop faster after charge termination and in theory charging will resume faster.
what's the difference between use2 and use? (and as an fyi I did change it from use2 to use last night... but been a cloudy day so haven't hit the magic 27.3 number yet. though I did not alter the 19 and 20 setting from 27.3