We are doing a home job with solar pool heating. We have bought 2 second hand professional pool solar panels and is now wondering what size pump we need to pump the water up to the roof and back. Does anyone know how to work that out?
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If you know your flow rate, and lift requirements, you can find a pump through http://www.northerntool.com or Grainger/Tractor Supply.
If the pump is to be operated off of solar panels, check the Northern tool website and see if they have one suitable. They should, they carry a number of them for RV use. Their pumps are not in the alternative energy section.
Regardless of operating voltage, check to see if repair parts are available for the pumps. Try get a metal housing as they distort less and are less prone to stripping threads when being serviced.
I think of 1HP power.
You should not have any problems using the existing pool pump if it is in good
working condition. If your installation is 30 plus feet away or mounted one story or more high, an additional one HP pump will be sufficient to get the warmed water back to the pool from the pool heater.You are getting enough flow if the panel is cool to the touch on a hot day.