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On Oct 15, 2014, at 2:50 PM, Michael Stinaff <mstinaff at gmail.com> wrote: > 3. (What I am not sure NUT can do) Each slave monitors either UPS group A or B depending on what it drawing power from. If that group drops below MINSUPPLIES then those slaves shut down. I forgot to mention: the slave configuration is generally going to be manual, unless you segment the UPS output circuits

Maybe this will clear up what I was initially thinking. In this diagram all lines on the right of the UPSs are power lines and all lines on the left are serial/usb lines. .---. +--|UPS+-----+--------+--------+---... | | A1| | | | | '---' .---+--. .---+--. .---+--. | |Server| |Server| |Server| | | A1 | | A2 | |