I just bought a new Battery Backup/UPS for my 400 Watt MH ballast (HarvestPro Switchable), as brief power flickers would cause it to turn off with a 4+ minute delay before starting up (my HPS ballasts don't seem to have this issue). As I was crawling into bed, the beeping began...

Observations
-the UPS (un-interruptible power supply) manual says that continuous beeping indicates "working under overload condition"
-the ballast and lamp were on, apparently uninterrupted
-main circuit breaker not tripped/broken, Battery Backup circuit breaker not tripped
-fan still working, turning it off didn't change anything
-the analog timer (a 2 outlet exactly like my HydroFarm model, but no logo) was on the last "on" notch, about to turn off
-the ballast turned off, the UPS stopped beeping

Possible Reasons
-the 850VA/425 Watt/1560 Joules UPS is just too small
-the cheap/knock-off timer may cause an arc or something that causes power output to temporarily increase while in the last "on" notch's position

Does anyone have any experience with similar equipment behaving this way?
feefigreenthumb Reviewed by feefigreenthumb on . Analog Timer with 400 MH Ballast Overloads Surge Protector Approaching Lights Off I just bought a new Battery Backup/UPS for my 400 Watt MH ballast (HarvestPro Switchable), as brief power flickers would cause it to turn off with a 4+ minute delay before starting up (my HPS ballasts don't seem to have this issue). As I was crawling into bed, the beeping began... Observations -the UPS (un-interruptible power supply) manual says that continuous beeping indicates "working under overload condition" -the ballast and lamp were on, apparently uninterrupted -main circuit Rating: 5