The SID10PV is a 10 watt 12 volt PV (solar module) direct pump capable of circulating up to 3.3 gallons per minute of water. It operates directly from a solar module with an input voltage up to 20 volts. The SID10PV starts to operate at 8 volts with as little power as 1 watt. This pump is designed to be used with a 10 watt module for circulating water and 20 watt module for glycol. It can be wired direct to the module in a solar hot water system eliminating the need for controls. When the sun shines the SID10PV turns on circulating water or glycol through a hot water collector. When the sun goes down the pump turns off. It’s that simple!