I need to aerate a small pond in my garden. I would like to build an autonomous system with a small water pump. The power would come from a small vertical wind turbine I will build. Since my pond is tiny (only 150 L), I will only need to pump small amounts of water, that too at a low height (20 cm is enough). The idea is to make some sort of a fountain.
The pump would only have to work when there is wind, because the pond is capable of staying in good shape without constant aeration by design (lots of plants, no fish). The flow rate could vary depending on wind speed.
I see two options :
- make an all-mechanical system, with the windmill directly powering a mechanical pump,
- make an electric system, with a windmill producing electricity (say, 12V) to power an electric pump.
For option 1, I would prefer to keep the design as simple as possible. Ideally I'd connect the pump directly to the shaft of the windmill. Since I know nothing about pumps, I'm wondering what type would be suited for this option. I assume that it would have to be able to pump from low speeds, and its torque would have to be fairly low (my wind turbine is going to be quite small). I was considering this, but the manufacturer says it needs 600 W to work.
For option 2, I'm worried about the fact that the pump might receive power on and off a lot, and I assume (perhaps wrongly) that these motors like to get constant power. If that is not a problem, then I'd probably get a small waterpump (like this).
Any advice welcome.