Problems with PowerTrust A2997A UPS

[Thomas Lawton_1]

I have had this UPS a while, but no power cable. I recently got my hands on one, after a year (the unit has had no use for a year). It worked fine but then i left it off for the night, and now when I turn it on the green light comes on but no AC output unless you press the test button (25-130V comes out of AC outlets for about 3 secs before turning off). It is a 240V model (UK). Recently I left the green light on overnight and it powered up, with an alarm - a beep every few seconds. I turned it off and went to bed. In the morning it had reverted back to the green light - no AC power. There are no warning lights on either.

[Bill Hassell]

The batteries are probably dead. Like most rechargeable batteries, they have a limited life and can be degraded if left discharged for long periods. It is also possible there is an electronics failure in the UPS.