Thanks Clay. I am not committed to 24x7 but I would like to be somewhat aggressive in the amount of aeration I'm doing. I get a lot of surface run off in my pond so sludge buildup has always been a problem. I dump several hundred dollars worth of algaecide and bacteria in it every year to keep in manageable but I'd really like to cut out that expense. So I'd rather go bigger than smaller. My main concerns on solar are two fold: 1.) The batteries likely will cost a couple hundred a piece and will need to be replaced every 5-7 years based on the research I've done. That already works out to $100-$200/year for a relatively small aerator. 2.) I'm concerned that those small 60w diaphragm pumps won't work well in 12' of water and I'll lose CFMs and burn out diaphragms like crazy. Any experience running those pumps at that depth?