Allllllllright, let's see if I understand this:
You have a generator powering an ATS, and a solar electric system with batteries.
Yes
 You cannot wire the generator input directly to the inverters.  You don't want the generator to run in a power failure, unless the main system batteries get to a critical point.
Yes
  Or do you mean when the generator starting battery is getting low (that 12 volt number is confusing me)
No
 If the first, is the generator to run in order to charge the batteries,
Yes
 or are the inverters to shed the load to the generator?
No
 
I'm just not sure that we're watching the same movie.... ;-)

Same movie but maybe it needs subtitles :-)

Phil
In the FINALLY sunny southwest

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