USNRET Posted September 27, 2016 Share Posted September 27, 2016 Info if you guys are using a UPS. I am using an APC S20 blk AVR UPS (around 6 years old now). Over the last week the alarm has sounded in the middle of the night with no indication of loss of electrical power. I ran the self test and got an Inverter Overload fault. Using the below link I found that I have at least one or more bad batteries (it holds four). Again using the links within the below linked page I found that I can buy the required batteries at around $13-14 each; MUCH cheaper than a new replacement pack. There is also a chart to give you the individual battery part numbers. I found the information most useful. http://www.stevejenkins.com/blog/2013/11/how-to-swap-rb63-ups-batteries-in-an-apc-s20-blk/ 1 Quote Link to comment Share on other sites More sharing options...
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