The plot thickens... At the link below Parallax answers these questions in their FAQ..
"Can I leave my Parallax converter system constantly connected to 120VAC power? Will this damage my batteries?"
"My friend has a "smart charge controller" that plugs into his converter system. Why hasn't Parallax offered a "smart" charger option for my unit."
So here is where I'm at on this topic...
- I need no more than 1000W from an inverter. ProSine1000 seems to be the best option.
- I don't plug my RV while in storage, so I've got no risk with the Parallax cooking them
- Last winter I invested in Battery Brains for both coach cells and the chassis battery to cut off the batteries when the voltage drops too low.
- After reading the FAQ, I'm thinking that Forest River didn't provide crap, but also failed to explain the downside of leaving the rig plugged in during storage.