I have a Multiplus 10, a Fronius 8.2, an MPPT 150, five Pilontech 3000 batteries and an EV Charging Station.
I have a problem that always occurs between late April and early May; I understand it’s due to excess production.
I think the MPPT controller is to blame. The errors occur in the same sequence; I then switch off the batteries and reset the error, and that sorts it out. The rest of the year there are no problems. How can I prevent this problem?
Internal faliure alarm the battery happens first as one or more module drops off the rs485 comms line. Internal communications.
The system then has dc ripple as your DC from your batteries is not handling life well.
The cause seems to be anhigh cell voltage alarm from the Pylontecs so they aren’t handling themsleves well
Ps you don’t have enough battery and if you have down stacks and have few take off points have a problem in the bank. Try rotate out the end ones and put them into the middle
What should be happening is through DVCC the charge current control is sent, if it is not being sent then charge by the system is not slowed down. It seems more of a battery control issue.
This is the only way to reset the internal communications.
Maybe add some screenshots of what the battery is sending to the system vs what the system is doing when all the drama is going on.
Couple of things to consider, your pack is a little bit small for a 10kVA inverter, it’s limits will be up to 187A and charge limits will drop.
If you subject it to high charge/discharge rates you will be punishing the pack, seen a few too many cells going bad in pylontech batteries when the pack is not ideally sized.
You also have a PV inverter, that is another variable when charging, hopefully it is being correctly regulated.
High cell voltages are often a sign of balancing issues or pending failures.
Post your cvl/dcl limits chart for the same time this issue occured.
If a battery is faulting and going offline it can cause issues.
Edit, you posted after I did. Looks like you are losing a pack from the DCL drop, that is quite a cell difference. 4V is seriously high.
I would get pylontech to pull logs and open a support call.
The voltage may be a symptom not a cause.
I presume the BMS is detected and configured as the BMV in system setup - DC options and DVCC.
Keep the cap on then you battery pack is literally being killed.
The 53.2 is the absolute outer edge the pylons can handle and grid feed in increaed it to a bit above that.
