I put a fountain in the backyard. My friend had an awesome solar pump for her fountain so I decided to get one for mine. It keeps the fountain running only when the sun hits it. It doesn't store energy which is great because then its not running all night long. Its actually a solar pond pump if your looking for one, I got mine off of eBay. My husband didn't care for the terra cotta colour of the fountain when we bought it but it ended up matching the colour of the planters perfectly so it works really well in the yard.