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Dear Eric,
As far as I know, the UPS itself has got its self protection charging method which is called as Temperature Compensated Charging method if your UPS has got an internal batteries. The Charging of the batteries will be controlled by the UPS as per the temperature compensated charging method.
The optimum operating temperature for a lead-acid battery is 20-25° C (68-77° F). Elevated temperature reduces longevity. As a guideline, every 8° C (15° F) rise in temperature will cut the battery life in half. A battery which would last for 4 years at 25° C (77° F), will only be good for 2 years if operated at 33° C (95° F). Keep in mind that the battery temperature inside your UPS will always be warmer than the ambient temperature of the location where the UPS is installed.
So in my opinion, setting the threshold for the UPS ambient temperature is recommended as the ambient temperature can be controlled by the Customer. If your UPS has an NMC with temperature probe connected to it to monitor the ambient temperature, then I suggest to create a Custom threshold for the ambient temperature probe reading.
That being said, DCE already has a feature to create a customized threshold in DCE for any sensors values that you can see under view device sensors. I can see an option to create the Customized threshold for one of the Smart UPSs that I have. I can see Temperature option to click on and create the threshold. If possible, can you please share us the screen shot to know which options that you see when you are trying to create the threshold for battery temperature? Is the temperature threshold type grayed out?
I also noticed that the DCE has already got a device alarm notification for Smart UPS which has an internal batteries. See below. So in this case, the DCE will show an alarm when the Smart UPS battery temperature is abnormal. The threshold of the battery temperature depends upon the UPS model and its design.
I hope this helps.
Regards,
Bala
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