No real solar, no generators, and no power.
Only two other options would be perhaps a wind turbine that can go on a portable tower? The downside is that the noise can be pretty bad on some models. Of course, there is setting up and taking down the tower (and some people might consider it an eyesore.) Barring that, there are fuel cells.
I'd probably say that the best solution, barring a windmill, would be to bring a number of batteries, and have a place at home with good trickle chargers (I like Battery Minders because they desulfate), so one has the batteries ready to go when wanted.
