Inverter battery charge voltage too high
I have a SunSynk 8kw (SW versionsL M 6.0.1.4 / S 1.7.2.4 / C E.4.2.4) inverter and 2x Shoto SDC10-Box5 5.12 kwh batteries. Batteries are connected to each other in parrallel and the master battery is connected to inverter via CAN so that everything can be handled by the BMS.
On the LiBMS page on inverter it always report the "Battery charge Voltage" as 57.8V
Yet, the battery data specification sheet stipulates that charge voltage should only be between 54.0 - 56.4V. Moreover, the Shoto batteries uses Seplos BMS and its overvoltage cutoff protection is set at 57.75V.
Why does the inverter think it needs to charge so high at 57.8V, then? This is not a reading it gets from the Seplos BMS, all the BMS parameters (via USB Battery Monitor software) have been checked for this.
Using Battery Monitor software one can see that at 98% SOC the voltage climbs until it hits 57.8V it which point it errors with total_voltage overvoltage protection and SOC jumpts to 100%.
On powerforum.co.za it was pointed out that it could be the inverter itself reading the incorrect parameter (in this case the overvoltage protection parameter) and using this as the charge voltage. Which is incorrect and probably will reduce battery lifetime.
Please see attached photos and screenshots.
Has anybody else notice the charge voltage from inverter side being too high? And how can this be resolved correctly?
Thank you.
Has there been any update on this from Synsynk? If not, for an end user, can anyone here post how to perhaps make any setting changes to limit the charge voltage? Just about to have a system installed with 4x US5000 so it's a big investment in battery and keen to do everything to prolong life!