Ze batteries, zey do nussing!
July 18, 2012 10:15 AM Subscribe
Why are my UPSs not pulling power from the generator?
posted by dozo to computers & internet (7 answers total)
We have a 1500VA battery backup powering 2 servers and a 1250VA powering our network and phone system. The 1500 will power the servers for 5 minutes (before initiating shutdown) and the 1250 will run the network and phones for 35 minutes, both reporting almost no load. We have a 15kw generator with a 60 amp breaker connected to the server circuit that kicks on when the power goes out, taking about 45 seconds to start. Our problem is that the UPSs don't go back onto line power when the generator comes on.
We've tested the voltage - from the wall it's a steady 120v, when the generator kicks on it fluctuates from 120-130v. We've used several UPSs (including a brand new one purchased for testing) but none will use the power of the generator, they just run down to nothing. The light in the server closet (generator powered) works with no problem, as well as several other things connected to it. Our electrician has tested all, says everything should be running fine and is baffled as well.
So, hive mind, I'm wondering - what the hell is going on? The electrician theorizes that the UPS is more sensitive to fluctuations, doesn't see the generator power as a good source of power and won't use it. Does anyone have any other insight?