Hi guys
I recently installed a DC-coupled 24 kWh Goodwe solar battery (3 stacks of GW8.3-BAT-D-G20 to be precise).
It's going well but the I've since found that the minimum SOC setting on the battery is currently set to 10% (I don't know if that's what the OEM had it set to or if the supplier had changed it to that on install), and I have reached this limit a few times now at which point the battery stops discharging and my inverter starts drawing power from the grid.
The Goodwe SEMS portal appears to allow me to lower this setting to as low as 0%, but I was thinking about lowering it to 5%. Lowering it from 10% to 5% has the benefit of getting me access to another 1.2 kWh of battery energy per cycle before having to resort to the grid, as well as just be able to have power longer into the night when the battery is in backup mode (it hasn't needed to go into backup mode yet because we haven't had a power outage since it was installed).
I've read mixed things about lowering the minimum SOC below 10%, and it seems that no one seems to have a definitive answer on exactly how bad it is for your battery lifespan if you do this.
So I wanted to ask you guys if you think occasional dips to 5% SOC (or even lower perhaps) will matter that much in the long term. I figure the BMS will intervene before the battery gets down to truly problematic charge levels but is this a good take? Would Goodwe really allow the user to lower the minimum SOC to levels that would truly cause appreciable damage to the battery? I want to maximize my returns on this battery but at the same time don't want to significantly reduce its operable life.
Amazingly and frustratingly the OEM manual for this battery doesn't appear to directly mention/discuss lowering the minimum SOC% setting.