I've been looking at the idea of using solar power in case of long-term power outages caused by a cyberattack on the electrical grid, or maybe an EMP event. I just wanted to be able to do small tasks like charging up AA batteries, electric shaver, things like that. It wouldn't have to be big or fancy. But when I've done searches for solar panels on Amazon that I think would do the job, I hear that it wouldn't work. I was originally thinking of getting a small solar panel and connecting the positive and negative leads directly to a battery to charge it. Other than a diode being handy to keep the energy from flowing backwards, would it work? Also, how would I know if the panel I choose is big enough without being too big? The ones on Amazon looked good (costing around $10-$15), but I've been told elsewhere that they may not be big enough to even charge 1 battery. I also considered a 12volt vehicle battery maintainer. They have those at Harbor Freight Tools, but then I was told that it would be too much. Well, if it's too much energy going into one AA battery, then is there a way of spreading it out over 2 batteries or more?