We had a thread here not long ago where were looking at possible "remote" power supplies for an RV where the RV had no battery in it. All you need is to plug the 120v shore cord into an inverter in the power supply.
The RV converter makes any 12v needed, but of course it costs extra amps (about 6a being a typical amount, so in an hour that's an extra 6 AH to get from the solar later on.
A cabin does not need any 12v stuff, just 120v, so you could park a 48v golf car (or your truck with batteries in the bed) outside with a 48v inverter strapped to those batteries and put solar on the roof of the golf car.
If the cabin is in the shade, move the golf car out into the sun--it doesn't matter so much how long your 120v line is to the cabin.
We park our RV for long periods in the one place and use it as a sort of cabin, so I keep looking at this, but can't escape the RV's 12v stuff totally (so far! :) ) A real cabin saves you from that.
Anyway it is another approach to the problem to give a thought to.