I swapped my 20 out for a 50 on my 936w grow. It only tripped when the TV in that room was on, but that was still often enough.
low_rdr Reviewed by low_rdr 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