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2.8
Configuring Batteries in Parallel
Normally, BMZ ESS batteries are plug and play. There are not many settings you can change on them.
A. Once the batteries are all configured and connected in parallel and the system is running with
the inverter, ensure that a discharge and charge cycle is completed. Afterwards, all batteries in
parallel should be ON, relays closed, and voltage synced. You should also be able to see the
number of detected devices and relays closed with the service tool from any of the batteries in
parallel.
1. IMPORTANT: Setting the battery device address and the mode.
A.
Always double check that the battery device address and mode is set via the service tool.
While it's not typical, sometimes, the setting does not save on the first try. Always click
the read from battery pack button to confirm the setting did save.
If the setting did not save on the first try, select the setting again and then press the
button on the service tool to set it. Check that the setting is saved by clicking the read
from battery pack button.
It can sometimes take a couple tries to get the setting to save. However, if you have tried
this several times and still the setting will not save, there is likely some internal issue.
Please contact BMZ.
2. Ensure the connections are correct.
A.
When putting multiple batteries in parallel, there should be both power and
communication cables connected to every battery once the setup is finished. The master
battery should be the only battery with a communication cable connection directly to the
inverter.
3. Everything is connected correctly but not all the batteries are being detected or
communicating properly with each other.
A.
If there is trouble establishing communication between all the batteries in parallel and the
previous two steps have been completed, change the device address of the master
battery to 2, instead of 1.
In some cases, if you have less than 12 batteries connected in parallel, setting the master
device address to 1 causes communication issues; it's not very common, but it does
happen.
B.
Make sure you have the correct communication cables. They should ALL be CAT5 patch
cables and the splitters used are what's known as Y-Adaptors.
4. Checked everything else, still won't communicate.
If you think you are having an issue despite verifying that connections and settings are correct,
check the pass-through ports for the ethernet connectors:
Page 10 of 14
Version 1.01
ESS Troubleshooting Guide
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