[BC] Cyberpower brand UPS

[tpt at literock93r.com]

Watch out for this brand of small UPS (they are sold at Office Depot).

Needed something with 4 instead of 2 outlets just to float the  
satellite receivers and air monitors for a few seconds until our geni  
comes up when the power drops.  The XDS takes about 2 1/2 minutes  to  
reboot, the Wegener, 8 minutes +; rather silly to have a generator but  
be off the air because I am waiting for a satellite receiver to  
reboot.  So I picked up a CyberPower brand 450 VA unit to sit in the  
equipment rack.

Yesterday --at 5:40 AM, a black snake crawled into the substation,  
killing power to the entire town. Or so the cover story goes. 3 phase  
power to us down until 11 AM.

Generator came up (Onan 20 KW) and I switched over to our single-phase  
back-up (a Harris 2.5 K). About a half hour passes--and both satellite  
receivers dump.  Apparently the CyberPower does not like the AC out of  
the Onan genset, it refused to switch back from battery and just ran  
down. No problem with the half dozen APC units I have on the  
computers, exciter, Omnia processors, etc.

Only two things comes to mind: A. The Onan's AC is not close enough to  
a sine wave to keep the Cyber Power happy (picky, picky!) or B. (more  
likely) voltage tolerances are way too tight.  Our usual line voltage  
floats around 217 to 220; the genset was made for 240.

I bought another APC UPS, the CyberPower unit is going home to back up  
my home computer. Much less "mission-critical" use.