Solar Powered Outdoor 20 Watt Garden Water Pump Landscape Fountain Kit Water Solar Pump is Designed for Fountain, Pond, or Outdoor Use, the Pump Gets Power Direct From Sun. This Save a lot of Energy & Money. Water rate is adjusted by a variable Speed Valve. Pump can be used either by day or at night. Battery back up. Day mode: This mode should be used when sunlight condition is good. Sunlight runs pump and diverge part of power stored in battery backup for night mode use. In this mode, the pump performance is directly related to the intensity of sun exposure.