I consider that being really risky. In an Alaskian winter, you will not have enough solar power available to waste as heat.
You may -at an average, theoretically- get 800Wh of power a day on snow-free panels, which is ridiculously low, absolutely not enough to keep your stuff above freezing, and surely not in a worst case situation.
Generators auto-start... or not!
You really should consider some propane/oil burner (maybe a car standby heater) to keep your stuff above freezing in a well insulated power room.
Will you get an alarm if something gets wrong? How long does it then take for someone to intervene?
What's the risk? I have 800Wh a day of PV in the darkest days of winter and a generator backup to power an electric fence and some USB powered security devices. In an Alaskan winter I always run the very real risk of not getting enough PV and there is the risk that the generator backup will break down, and then the electric fence won't be charged. But not getting enough PV isn't likely to happen except Nov-Jan when the sun is the lowest and the bears should be sleeping by then. If that happens then we'll just be counting on the cabin design to keep the bears out (which was our primary design consideration). But IF there isn't enough PV and IF the generator has an issue and the electric fence goes unpowered and IF the bears aren't sleeping, then we'll just have to accept that risk and hope that our cabin design keeps them out.
The way the Relion-LT battery works is if the PV is producing below freezing, the power from PV is diverted to a 3amp heater that heats the cells up to temp and when they are above freezing the PV power will then start charging the cells. If the PV isn't producing, the battery won't be heating. A real waste would be heating the battery up during times when the PV isn't producing and there is no juice to charge it, or if the generator backup has already filled the battery up. In that situation, the power used to heat it would be wasted because there is no PV to charge it anyway, or because it's full and doesn't need juice from the generator.
If there was some auto propane/oil system that I could use to heat up the batteries I would certainly be interested in that. I'm not sure if I can buy heating oil and transport it up in the ATV or not though. I don't know much about heating oil although lots of people use it. My impression is that it's not really portable but I don't know. But that system, open flame, would be the biggest risk given that I live in a place that has earthquakes and I'm in the middle of a tinderbox forest. But there are some safety features of propane systems that could mitigate that risk, but I haven't seen a propane system that will kick on or off automatically when needed to maintain heat. I have seen one that will maintain a certain temp/setting and runs automatically but I don't need it heating the place in the middle of the night because nobody is there to enjoy the heat and the batteries can't take a charge (unless from the generator).
At this point I'll use a Relion-LT battery which will heat itself when it's getting PV and then will accept a charge, and hopefully that will be tied into a generator backup such that generator supplied power (auto-kicked on) will heat the LT battery and then accept the charge from the generator. That should be enough to supply power to the electric fence and bear security devices when we're not there. I would imagine that would keep everything powered for weeks even in the dead of winter but who knows.
When we are there, we'll simply heat the place up with the wood stove and then the 48V bank can take PV power and generator power.
When we're not there, there will be nobody to intervene. We live in the middle of nowhere and I do not want to be locked to the place and unable to travel because I need to manually heat the place so that a battery can take a charge. The RELiON LT with generator backup should fit the bill and heat its cells (rather than a whole battery or a whole room) to keep the security systems powered while we're away using the tiny amount of PV available and using the generator that is controlled on/off by a SCC or some other device.