Short answer: It depends on where you live. To get the most out of solar panels, you need to angle them toward the equator, and tilt them according to your latitude. In regions farther to the global north or south, you'll likely generate less power than in regions closer to the equator. Likewise, the power generated will correspond to the season and weather. In other words, a cloudy week in Alaska during December isn't going to give your solar panels as much to work with as a sunny week in Florida during July. That said, solar-powered security cameras generally use batteries to store the power generated during the day, so a few cloudy days probably aren't going to mean a cut feed. In short, they're not foolproof, but depending on your region, solar panels can seriously lengthen the battery life of your outdoor cameras -- or even do away with regular battery replacements altogether.