Over 30 wasn’t a typo. I’m Canadian so I meant 30 Celsius (hot). Not 30 f which is our zero. Lfp charging temp is 0-30 Celsius.Under. Gotta be above freezing all the way down in the cells.
Breakers are a handy thing for that, built in disconnect.
The advantage to rackmount batteries is that it's becoming a common form factor. The downside to them is that it's really hard to find 24v rackmounts anymore. If you were to go with a EG4 3Kw unit, or the MPP-3048LV, both would get you 3Kw of inverter, the charge controller, generator hookup, etc and get you into the 48v range where rackmount batteries are common. If you go that route spend the bit extra on a Trophy battery and it takes care of the heating and low temp and all for not much more than a basic 48v rackmount battery. The Trophy batteries also come in larger capacities than 100Ah which is pretty handy for those long winter days.
Just put in the notes that when the alarm goes off go fire up the generator. When the generator winds down (not charging the batteries anymore and just idling) and gets quiet go shut it off.
the rack Mount have their own breakers so I could just use that. I have no issue going 48. Seems like that where everything is going.