Frequently Asked Questions
Find the answers 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.
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.
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.
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.
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.
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.
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.