Hi itinerant1,
Are you able to power the roof air conditioner from the 1280 watts of solar panels (via the Magnum inverter/charger)? Or do the batteries have to pick up some of the load?
BFL13 is not trying to snipe--he just requires more information than most folks. And DON'T try to talk to him in watts. Watt = What Are Those Things to him. He drives me crazy sometimes--but I'm sure I return that favor (perhaps even with interest?)
I'm QUITE jealous of your system.
Unless there is a shift low temperature chemistries it is unlikely that anyone in Canada (or Alaska) is going to go LI. Having to keep the batteries in heated storage is a PITA.