How old is the UPS? Have the batteries ever been changed? Sounds like you have open battery string(s), which would cause the UPS to lose power to load on loss of utility power. The batteries are your backup to the critical load. It only takes one bad battery in a string to compromise the entire string and render your UPS nothing more than a line conditioner.
Swich on off aftar battrie low
I agree its probably time to change the battery. If you are looking for a replacement you can check out http://www.batteryinternational.com/ups-batteries.html
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