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After firmware upgrade I get Communication Fault Between battery and Device ?
Posted: Fri Dec 12, 2025 5:21 pm
by AllanJacobsen
Hi
The system has been running OK for a few days, and then I wanted to upgrade to the latest and greatest firmware, but that seems to have given me problems.
It is a H3-pro-15.0 Inverter with 2900-2 batteries (14.4 kWh) and after the upgrade the inverter is running these firmwares:
Master: 1.74
Slave: 1.06
ARM: 1.44
The battery is now running 1.014, I tried to upgrade to 1.015 but that did not seem to work.
Does anyone have any ideas what to look for ?
Re: After firmware upgrade I get Communication Fault Between battery and Device ?
Posted: Fri Dec 12, 2025 6:23 pm
by AllanJacobsen
Now I have looked through all the menues, and there are a lot of new parameters in the new firmware for the inverter, so maybe it would be a good idea to reset it to default values, is there a way to do this ?
In some menu items it says "Unexpected value" and that cant be good.
Re: After firmware upgrade I get Communication Fault Between battery and Device ?
Posted: Fri Dec 12, 2025 6:35 pm
by Dave Foster
As a rule the firmware updates would set a new parameter if it is necessary otherwise leave it null (which will show unexpected) it shouldn’t be a problem - you can do is a master reset which takes it back to default but it’s pain to set it up again.
On the batteries you need to update the BCU first (master) to 2.010, and then followed by BMU to 1.15
It is possible during the upgrade the batteries have lost connection with the inverter, a normal shutdown and restart will clear that i.e. PV off, AC off, battery off - wait for inverter screen to go blank, then power on battery, then AC on, followed by PV on.
Re: After firmware upgrade I get Communication Fault Between battery and Device ?
Posted: Sat Dec 13, 2025 3:18 pm
by AllanJacobsen
Thank you for the upgrade advice, I now have the battery at version 2.010, but something is still wrong.
The power in the battery is not used, even if the Operation mode for the inverter is set to "SelfUse", there is a consistent alarm of "Communication Fault Between battery and Device" for the inverter, but at night it still charges the battery between 03:00 and 05:00 as set i quick settings, so it does communicate with the battery. On the inverter display is says "BMS2 comm lost" but there has never been more than one battery in this setup.
What should look for ?
I have tried to power everything off and then on again after 5 min. but it does not help.