Hi Guys
I have a MultiPlus 24/3000/70 (Firmware 158)
Cerbo GX (Firmware 3.01)
With a pylontech UP2500
I get a GX Error 48# DVCC with incompatible Firmware warning.
Right after this error the inverter gets low battery warning and the system reboots.
I also have high voltage warning, but I understand this as the cells needs to balance.
Anyone know how to fix this?
Thanks in advance.
Some more pictures for context.
Regards
Maybe a newer Firmware for your GX ?
And reduce your DVCC Voltage for the Pylontech !!!
What would you recommend it being? It's a 24 battery?
Pylontechs dont like such a high Voltage.
Do you use the DC cuppled Feed In ?
Is the 2500 24V a 6,7 or 8S ?
Maybe a 8S ... 3,55V x 8 = 28,4V ?
Try to reduce to a 3,35V Cellvoltage ... 26,8V ... and take a look at the SOC ... Maybe you only reach a 97% ... This will be ok and better for the Pylon
Pylontechs dont like such a high Voltage.
That mostly applies for Pylontech 48V (nominal) LiFePO4 batteries, because those have only 15 cells (instead of the usual 16 cells).
As far as I know, all LiFePO4 24V batteries have 8 cells.
28.4V Absorption voltage should be OK if the cells are well balanced. If not, you do need to decrease it (and reduce the charging current) untill the BMS brings the cells at closer levels at the top (when fully charged).
At 25.6V the BMS won't perform any cell ballancing.
-------
Absorption:
Start from 27.6V.
If no issues, you can gradually increase it to 28V, then 28.4V.
For well matched and ballanced cells the absolute maximum would be 28.8V. But that requires a "perfect" battery.
Note:
Until cells are ballanced at the top, you might have to also reduce the charging current.
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Float: 26.8V
Thanks for your help in advance.
I can't say a specific value. If you get high voltage alarms even with lowered charging voltage, then reduce the charging current too, until you no longer get those alarms.
Monitor the cell voltages during a few charge/discharge cycles and when you see that the cell voltages start to get closer when the battery is near full, you can increase the charging voltage and/or current.
Hi @PJ Harmse
Your Multi's 158 fw is ancient, and probably causing all your issues. The latest is like 506, and should help greatly. There's also this article which specs a min well above 158.. https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom
It *might* be possible via VRM portal, and that's worth a look because it's so easy. If it says no, you'll need a pc and a MK3/usb dongle to do it locally. Take a look on the Victron website >Downloads for VE.Flash software and the instructions on how to use it. Approach this with respect, you'll need to be careful following the steps.
The Multi will be switched off during the Update !!! Youre Communication Device must be plugged in a independent Powersource ... Not supported by the ACOut !!!
According to your screenshots, your Multiplus is 2612, so that's one with the new microprocessor.
You should be able to upgrade the firmware to the latest. Check the manuals for details.
Upgrading via VRM requires at least 426 as a minimum version to start from. You have 158.
You need a MK3 Interface and a "direct connection" via VE Bus RJ45 Connector LAN Cable
