Hi, can I ask for some help/advice please.

I have a Goodwe 5048 ES (Firmware version on the inverter is 122214/2222E) and 6.6 kW of PV and a home-built battery. 

For a BMS I am using a system that was made here in Perth (Australia) by ZEVA (unfortunately they are not made any more) https://www.zeva.com.au/index.php?product=140.   Functionality includes balancing, monitoring each cell voltage (high/low), overall high/low voltage protection, high/low current protection and SOC etc. This BMS controls its own contactor so can isolate/protect the battery if need be. The BMS used the BYD protocol to talk to the inverter via CAN bus and set the SOC, set voltage, charge rate etc.

I first installed the battery over a year ago (June 2022), and the whole system worked fine. It ran this way for around 12 months. Unfortunately when I recently had some electrical work around the house, somehow when the electrician isolated the house (and battery) something went wrong and now the inverter is throwing up a "Battery Communication Failure" for the BMS status (note all he did was throw the breaker to the battery so no idea how it created a problem). As I have built and installed my own battery, the agent who installed the solar/inverter doesn't want to know about it. 

 

So I have disconnected the CAN bus and I am now running in "self defined" battery mode on the inverter, but I am finding the charging algorithms very poor compared to when the BMS was running the system by the CAN connection.  Also I am having issues with things like the battery SOC being out of alignment with the inverter's SO level and not being able to reset it.

 

Has anyone seen this error before, and have any idea how to clear it etc?  I have tried:

1. re-booting the inverter
2. isolating the battery and setting the inverter to "no battery", then adding the battery again
3. Borrowing another BMS module and connecting that, but it still gave the "Battery Communication Failure" so I assume it not my BMS

Has anyone had any experience with anything similar?  And ideas how to clear or diagnose the "Battery Communication Failure" error?

Hi!

 

have exactly the same problem and root cause. Shortcut in breaker and since then communication failure.

Did you manage to work out the solution already?