With 3 hours 52 minutes of daylight, and the daylight not quite making it over the trees since October, whatever the solution is has to work for about 9 months straight with no recharge. Summer, all three months of it, is not a problem to begin with even if the power goes out altogether.
” With 3 hours 52 minutes of daylight, and the daylight not quite making it over the trees since October”
Where the heck do you live, Alaska?
I guess you will just have to burn whale oil...