Frequently Asked Questions

Find the answers12v dc water pumps below to all your questions about Solar Water Pumps. If you don’t find what you are looking for please contact us and we will be happy to answer your question. 

PSI stands for Pound per square inch. The pressure found in any enclosed system. i.e. Typically on a municipal water supply the static water pressure will be 30-60 psi.

The rated Static Pressure of our dc water pumps is the pressure the pump can handle. It is not the pressure the pump generates.

This will affect your choice of solar water pumps.

The amount of Voltage required to run the pump.

Water Pumps that run on PV can handle the voltage fluctuation that PV panels produce. Nonetheless, pumps are primarily designed to run on their stated voltage. For example, 12V dc water pumps should be run on a 12V PV panel and 24V dc water pumps on a 24V PV panel.

Constantly running a water pump on higher voltage will increase the speed on the pump but it will also greatly reduce their life expediency. Running the pump on a lower voltage will in turn slow the speed of the pump but will not reduce the pumps life expediency.

The minimum amount of Watts required to run the pump
The minimum amperage required to operate the pump.
The minimum amount of Watts required to operate the pump when running directly from a PV panel.

Please remember most PV panels are not putting out their rated wattage until full sun. If you would like the pump to start running earlier in the day than full sun it would be good to utilize a larger Wattage PV Panel. While higher rated voltage than specified can affect the pump a higher wattage will not. The pump will only draw the wattage it requires.

Photovoltaic, (Solar Panel) a specialized semiconductor diode that converts visible light into direct current (DC). Some PV cells can also convert infrared (IR) or ultraviolet (UV) radiation into DC electricity.
Head is the height at which water pumps can raise liquid.

Please bear in mind that most of our customers are dealing with an enclosed solar hot water system. One where the hot water panels are on their roof. In an enclosed system, that is one completely void of air, head becomes almost a moot point. Hence, as the saying goes, what goes up must come down.

Water in a solar hot water heating system that is coming down off the roof creates a syphoning effect on the water going up to the roof, thus effectively offsetting the head pressure.

In such cases the flow rate is normally the primary concern.

Submersible pumps operate in or out of water. Their waterproof housing allows them to be submersed without causing damage.

Important. Please note that dc water pumps marked as H (for high temperature rating) cannot be submersed in high temperature liquid. You must either use the pump as an external high temperature pump or a submersed low temperature pump.

A blockage of the flow in a pump or pipe, caused by an air bubble. An air lock is a restriction of, or complete stoppage of liquid flow. This is caused by air trapped in a high point of a liquid-filled pipe system. Air, being less dense than the liquid, rises to any high points. When pressure is applied, instead of the liquid flowing as it normally would an air lock occurs. Simply put an air bubble reduces the flow in direct proportion to the size of the air bubble. Example: a 1/4” bubble in a 1/2” line reduces the flow by 1/2.

It is common that problems with a system are due to a trapped air bubble. To fix this problem be sure to carefully purge the air from the system.