UPS is no longer working with my Mac mini

My street has a lot of power outages, so I've used UPS units successfully for years with a series of Mac minis. Recently, my mini has shut down instantly on each of the last four power outages, rather than keeping going on battery power as it's supposed to. I bought a new battery, but then the old battery also tested okay. Today, (using the new battery) the lights stayed on on all the peripherals that were running off the UPS battery, but the computer shut down instantly. The APC phone support tech raised the issue of some computers needing pure sine wave UPS, but all the forum discussions on pure sine wave here say to ignore that.
How do I diagnose this problem?

It has to be the UPS since the MIni is sensing that power is lost to the computer when AC power is lost to the UPS. Yes, some users have had problems with APC UPS.
You UPS is old and has been discontinued.
http://www.apc.com/resource/include/techspec_index.cfm?base_sku=BP500UC&tab=mode ls
I would get a new one

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