Warp, solar power doesn't need "step outside and you're blind" levels of sunlight. (Our farm manager installed solar panels for the outbuildings when we found out that the 1928 installation was seriously out of code -- like uninsurable -- and re-running the wiring would cost us around $40K. The panels work year round, even in winter in Indiana.) A desk lamp or a window sill facing north will power a solar cell.