Solar Pond Pumps are extremely simple. First, there are different types of solar pond pumps to worry about. One, an aerator pump, which pumps air into the pump. The other is a water pump, which moves water around the pond. Whether your solar pond pump is an air or water pump, it works the same way. The solar panel either chargers a battery (which then runs the pump) or powers the pump directly. The pump then does its job, either aerating or moving the water in your pond. Solar pond pumps with batteries can operate at night or on cloudy days because of the stored power in the battery, but a pump without battery can only operate when the solar panel is in direct sunlight.