I have a couple solar systems running on 300 watts each. I use two conventional lead acid batteries in parallel in each. I run sewer aeration pumps made by blue diamond. They are shallow pumps so only 5 feet down. You can hang the aerator from a float and then anchor it. I use this setup because its way cheaper and uses very little wattage thus it runs longer without sun. You can run a very cheap modified signwave inverter with these pumps. They have been running for years and keep the ice open even up here in Wisconsin. I had trouble with muskrats chewing on my floats and puncturing them. I use a "Jolly Ball" made for horses now as a float and the muskrats don't chew on them.

I was so impressed by what a simple solar system could do that I built one for my home, but that's a whole new story.