Warm APC BX1100LI-MS even when devices connected are off

[BillP]

This is my very first UPS. 

I have two devices plugged into the ups:

• Plasma TV (200 watts)
• Non-gaming Laptop w/ battery (? watts)

Add'l Note: I don't have Airconditioning  in my room. Battery is fully charged I think.

I don't have a device to measure the temperature of the UPS, but when two of my devices are on, the heat when I touch is also similar when the devices are off. I bought the UPS just five days ago. Is this thing normal? or should I feel a little bit concerned?

Thank you. 

[BillP]

Hey Chris, 

What is the model of the UPS? What is the serial number? They would be found on a white sticker with barcodes. 

From those, I can figure out the date of manufacture. Sometimes if a UPS sits in a warehouse, not being used, the battery can dry up, and can have issues with heat. The battery might need to be replaced. 

Thanks,
Shanon

[Anonymous user · Accepted solution]

The heat you feel is almost certainly normal. Portions of your APC UPS are powered any time it is plugged into a working outlet, including the battery charger circuit. Even if the battery is fully charged, the unit's circuitry isn't quite 100% efficient. Some small amount of electrical energy (usually about 8-10 watts, maybe a bit less) is lost as heat.

Only if the unit is extremely warm or too hot to touch would there be an indication of a potential problem.

[BillP]

• Supplier Part Number: 0L2346
• Product Serial Number: 3A1632X25388
• Supplier Part Description: LIT KIT APO BX1100LI-MS-ROHS

[BillP]

It's not extremely hot nor too warm to touch. The warm part is the top of the UPS (near battery connector) and on the back-left side of the UPS. 

Also, there's no sound/alarm or whatsoever coming from the UPS. Just silent, like there's nothing inside the UPS, which is a good thing I guess.

Hopefully the heat generated when the devices are off will not consume a lot of electricity.