Have you considered replacing your units with newer heat pumps? When we ordered our 5th wheel, we specified two 15k heat pumps. Only use propane when the temp drops below 35. And with the efficiency of the new units we spent 6 weeks in Florida last July and only needed to run one a/c unit.
I think you’ll find more problems trying to adapt the split units running off solar than the cost of new heat pump units running your generator.
That’s sound advice and probably much more practical but I like to try to push the envelope if I can find a way to make it work. I also don’t want to be having to run in for propane refills frequently, the tank is pretty large. It’s not as if I could pitch it in the back of the truck and go trade it in at Blue Rhino or anything.