I think making use of solar energy is your best choice. Consult with an electrical expert or if you are confident enough, you can buy solar panels, batteries and charge controller and try to make it your own. Use solar panels for charging the batteries and connect them to the inverter. Try to find necessary utilizes less power as possible, which will better for an off-grid cabin. A few years back, I owned a small cabin which was off the grid too. I used solar panels, batteries and stativolt inverters made by staticon and never had any issues with power for my limited needs.