Solar Powered Battery Chargers come to use when you may be camping, or out doors for a while. the way solar power works is it takes the sun rays and turns them into energy. So when the sun is shinning, you can charge your batteries. solar power has many uses, not just charging batteries, or providing electricity for your home, but you can use them to light up your yard, and you can use them for your electric fences as well. Depends what you want to do with your solar power. So when you need your batteries charged, consider solar power Battery chargers.