I have recently retrofitted 2 x Pylontech US3000's to a pair of Axpert 5K inverters wired and configured for parallel operation. I referred to the Pylontech SOP document for installing with Voltronic Axpert inverters
Using this, I came up with the following :-
Item No. Description Setting Value
Program 02 Maximum charging current 70A
Program 05 Battery Type USE
Program 12 Back to grid voltage 48V
Program 13 Back to battery voltage 51V
Program 26 Bulk charging voltage 53.2V
Program 27 Float charging voltage 53.2V
Program 29 Low DC cut-off voltage 47.5V
This seemed to work, except that the inverter would give a low battery alarm when there was plenty of charge left in the battery. After some reading (on this site) I learned that the alarm occurs at 2V higher than the value used for Prog 29, so I set it to 45.5V. It seemed that this might be too low, because after along bout of load-shedding, seemingly the battery shut down before the inverter shut down. Today, I raised it up to 46.5V. There was a 4 hour load-shedding and after a short while the inverter alarm sounded although the batteries were still showing 4 out of 6 SOC LEDs on (about 65% SOC).
Can anyone assist with this? I have not used the ICC solution because it was not budgeted for. Any suggestions/improvements on the parameter settings shown above, in particular Prog 29 ?