Why does the battery get drained beyond limit by 1%?
Enjoying the sophisticated feature set of this inverter including setting limits. There is however a subtle unexpected interaction between limiting battery draw SoC vs charging it from grid.
In my case, I set the battery SoC to be limited to 40% between 00:00 and 06:00 and I also had the option to charge from grid ticked.
Seems the inverter lets the battery get discharged a little too much past 40% and down to 39%. Then the grid charge feature kicks in to get it charged back up to 40%. Then it discharges 1% back to 39%, then charges up again to 40%, and so on. Seems counterproductive to let the battery discharge by 1% and then recharge it. It would be better (more efficient and less battery cycle degradation) to simply stop using the battery at 40% and rely on grid.
Solarman device data with graph showing SoC discharge and charge cycling between 39% and 40% (with annotation).
My system mode settings example:
Note, I might consider dropping SoC to 30% for 16:30 till 00:00, then wanting grid to bump it back up to 40% after 00:00 in case of a power failure the next morning. For now, I've unset grid charge to avoid the SoC flipping up and down between 39% and 40%.
Hi @jp.vanriel, you might have resolved this already, but I also observed this, and solved by un-ticking "Priority Load". No one from Sunsynk has answered me on what exactly this does, but since I un-ticked this, the grid just "trickle charges" the battery to keep it at minimum SOC. Hope that helps.