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1. The battery voltage has dropped below 45V but will still turn on, what can I do?
You MUST immediately take steps to charge it!
There is limited time before the voltage will drop past the point of no return!
A.
If it's not so low that the inverter won't turn on, it's possible you can still charge it via the
inverter provided the charging starts no more than 60 seconds after you turned the
battery on. Ensure the charging current from the inverter is limited to 20A if voltage has
dropped below 40V.
B.
If the inverter will not work at the voltage the battery is at or you are not quick enough to
get charging to start before the battery automatically shuts down, it is possible to charge
via a bench top adjustable lab power supply. Turn the battery on and before 60 seconds
elapses, apply a charging voltage of 50-55V at up to 20A to the battery power cables. The
battery should accept the charge if the relay is active. Allow the battery to charge until
the voltage has reached at least 50V, then you should be able to use the inverter to
continue charging.
Without communication from the inverter, it will shut down after 20 minutes. So, until
the voltage rises to where you can start charging with the inverter, you will need to
manually restart it.
Do not use another ESS or battery as a power source for charging.
C.
As mentioned above, if the battery drops to around 30 volts, this is considered the point
of no return and the battery will not be recoverable.
D.
If you are unable to charge the battery yourself or it has passed the point of no return,
please contact BMZ if you would like to purchase a replacement or send the battery for
disposal.
2. The battery voltage drops significantly as soon as I connect a load.
A.
If the battery voltage is under 50V, try charging it first.
B.
Check the external power connections. If these are ok, then its likely there is an issue
internal to the battery. Please contact BMZ.
2.4
Inverter connected to battery will not turn on
1. Ensure the battery has proper voltage.
A.
This means higher than the minimum battery voltage and the inverter is compatible with
ESS voltage levels.
B.
See the section in this document that details voltage more.
2. Ensure the positive and negative battery terminals are connected to the inverter properly.
3. If the above is verified and the inverter fails to turn on, this is an inverter issue.
Please contact the inverter manufacturer for assistance.
2.5
Service tool communication error or failure
The battery must be ON and computer connected via USB cable for the service tool to communicate
with it.
1. Ensure the correct service tool version is being used for the firmware on the battery.
A.
The service tool is paired with the firmware version it's meant to operate with.
Page 7 of 14
Version 1.01
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