Jimmie, I have used the APC 600 for years with the printer plugged into the surge protector side only and have not had a problem. What I have noticed is that the back up batteries can fail without warning, as happened to you last week. I have upgraded to a Cyberpower brand UPS for my server. It has buttons that I can push to tell me the voltage, health of the battery, etc. These are available on Amazon and other places.
The other question for the technical experts is how many surges can an APC 600 or other UPS handle before it goes bad? I wonder if this is why Jimmie's unit failed as we have power fluctuations and we have had several lightening storms this summer.
