Battery Temperature - BMZ ESS Troubleshooting Manual

2. If the battery is verified as working properly and environmental conditions are verified as
acceptable:
A. Check if system will function once battery and inverter has been restarted.
B. If system does appear to function, keep it under observation.
Normally, only a condition external to the battery will cause it to stop working. Therefore,
if an unexpected shutdown occurs, it's very likely due to something external to the
battery which it has no control over.
C. If system does not work properly (i.e., inverter fails to work) despite the battery operating
properly, it's likely an inverter issue.
2.7

Battery Temperature

Please ensure BMZ ESS batteries stay within their specified temperature range.
A. If an environmental condition like temperature is causing an issue, you must resolve that as
soon as possible to either prevent battery damage or voiding of the warranty.
Keep in mind, the battery has mass and it may take some time for battery to warm up or cool
down.
B. If the battery stays within -20°C to 60°C during discharge or storage and 0C and 45C during
charging, no damage will occur. The key point to recognize about this statement is that the
battery will not be permanently damaged and is recoverable if exposed to these temperature
ranges. The key caveat to the previous statements is that this range is outside the ESS
operational range. Exposure to temperatures outside the ESS specified temperature range can
cause degradation to the battery lifetime as well as possible triggering of battery protections
which may require servicing.
1. My battery got too cold or hot, what do I do?
A. Allow time for it to warm up or cool down, it could take some time for this to occur. If the
temperature exposure was not too extreme, the battery will recover.
B. If protections did trigger and the battery now has no output despite cooling down or
warming up, it's likely that it will need further evaluation by BMZ.
2. What method can I use to prevent the battery from getting too hot or too cold battery?
A. It is best to keep BMZ ESS batteries in a climate-controlled room, container or cabinet.
B. It is possible to insulate the battery against the cold with a method such as wrapping it
with a blanket or using a small heater to maintain the battery at a WARM temperature;
this means above 0°C but not higher than 30°C. BMZ assumes no responsibility for
damage that may occur from this scenario if the operational temperature of the battery is
exceeded.
Please keep in mind that charging or discharging the battery will also cause an increase in
temperature. For this reason, there is a fan on the back side of the housing to provide
cooling once the battery reaches above 30C.
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