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Solar Pool Pump

 
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I am looking to move to a purely solar powered dc pool pump.  I found a pump that meets my needs.  It is 72VDC 900Watt pump.  It is designed to run directly from the solar array.  The description recommends 6 panels - 200watt@18v.  The panels are hard to find with that configuration. In other forums, guidance is to provide 1200Watts but no mention of the volts.  One even stated 12 panels - 100W@12V.  I am not sure of the panel configuration, but thinking they would want 3 in series and 2 sets in parallel of 3 parallel. (54V)

Thoughts on if the wattage is more important than the voltage for these pumps or if I need to consider both?  

I could wire these to have 6 in series and 2 sets in parallel to meet both needs. (72V)
I could wire these to have 4 in series and 3 sets in parallel to meet both needs. (48V)

this is where my knowledge seriously breaks down.
Thanks for the help.
 
Posts: 280
Location: Philippines
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DC motors will run at lower voltage than its ratings at lower speeds of course. So it is better to get a reciprocating pump. they will deliver regardless of speed. There are solar pump sets if you can get one you wont have problems with matching. My friend got a 1hp submersible pump set.
 
julian Gerona
Posts: 280
Location: Philippines
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also try to avoid batteries. That's where your electricity saving goes. Centrifugal pumps needs certain speed to deliver. thus a set battery. Personally I wont go that route. piston/reciprocating pump will be my choice for solar driven. You wont need a battery for this
 
Posts: 74
Location: The Netherlands
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At that Voltage your looking at 12,5-ish amps. I don't know much about pools, does the pump need to run all day or can it also run parts of the day on a timer?
 
Johan Thorbecke
Posts: 74
Location: The Netherlands
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More than a grand for a pool pump, yikes.
 
frank li
Posts: 600
Location: Michigan
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Johan Thorbecke wrote:More than a grand for a pool pump, yikes.



Yes, pools are expensive to own and operate. They are a luxury.

Gallons per hour and gallons per watt equal performance and these will direct drive with the linear current booster/controller.
 
Posts: 38
Location: north west Michigan
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I recommend looking up a bubble pump. I have just started to read through 'Organic Pools diy manual' by David Butler. The bubble pump he uses is just a water pipe with a vertical portion (L-tube) that he inserts a air tube from an aquarium. Air mixed with water is less dense than water so it will exit the top. This will draw more water in the bottom of the L tube (through filter?). This should result in a huge savings in power because you are moving air instead of water. I am not familiar with pools, I just thought this might help.
 
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