I'd have to agree. If the system is left for unattended periods of any length, and the only task at hand is floating the batteries, solar is probably best. And, it would take much.
If on the other hand there are electrical loads to maintain - refrigeration, irrigation or stock watering, security lighting, any sort of HVAC equipment then it might be a different answer. We don't know from the OP how well equipped the cabin is. For some it's "roughing it" at camp. For others it's another home.
The Classic does have at least one other advantage worth a mention (and not that it is the best fit here). It does allows you to monitor log data from afar, not real time, but you would at least know whether and what the production has been, and be able to monitor the bank voltage. I suspect there may be less expensive ways to just do the latter. There are of course also solar systems that can stream data to a webhost.
~ks