On the FM60/80 the negative terminals are common. The CC can’t see if you run
the bat only or PV and bat. It doesn’t matter, it measures on the + side.
As to how the FM 100’s work I have only hooked them up PV +/- in to allow use
of the ground fault features, so I don’t know.
In regards to CC
The original system installed in 2016 was:
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1 - 48v/2490ahr HUP Solar One battery bank
24 - 280watt Solar World PV mods.
2 - Wattson trackers (I live in a SW x NE canyon; sun rises late, 9:30-10:00 in
winter & sets at 4:00) It’s a narrow window hence the a
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