Question about APC (BE500U-WEB) (BE500UWEB) UPS System
I bought an APC UPS (350 ES) on ebay - seller says the battery was good. However, when I pull the plug, I get no battery power. The plugs get ~118 when the unit is plugged into the wall. When I pull the plug, it immediately drops to 0.
When I pull the battery out, it reads 11.5V, and when I plug the unit into the wall and test the two leads which attach to the battery, I'm reading 14V.
I'm moderately comfortable messing with electricity and the sort, so I'm not afraid to break this open and take a look inside, but I don't know what to look for that might cause this problem.
As best I can tell, it woudl seem that the battery is holding a charge - and is charging correctly - but when the power goes off, it's not switching to battery power.
Occasionally when I plut the backup into the wall the power light flashes and the unit emits a non-stop beep. I think I read somewhere that it's saying the battery is dead and should be replaced, though the electrical tester would seem to suggest that diagnosis is incorrect?
I only paid $9 for it, so if it's dead, it's not the end of the world, but it'd be nice to get my satellite receivers on battery backup for the occasional power glitch that we get here (they're pretty infrequent, but my silly receivers take 10+ minutes to reboot, so I'd like to get this worked out).
>> I'm having the same problem with mine. I get 122 volts when plugged
into the wall, and it tells me that I get less than 1 min of use once I
unplug, and it actually lasts for 10 seconds before getting a
The screeching sound is normal. Its telling you "HEY, I HAVE NO POWER. THIS IS A PROBLEM." and trying to attract as much attention as possible. It will also do that if you run a self test with the software and the test fails.
Its been a while since I worked on these during an outage, but I believe there is a way to use the software (PowerChute business edition, if you're using a SmartUPS. There is a personal version with less features for other home models) to silence the alarm. I think some of them had a button you could push on the unit to silence it as well, but look this up first. Push the wrong one and it powers everything down.
Posted on Apr 29, 2009
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