Hey Lee, Allan is right in that the WINcaps software is a lifesaver and FREE! Not to contradict Allan, but I do not see a feasible way of using two float switches in separate tanks with only one pump controller. Also, the 3000' distance is a little far-they usually recommend a max distance of 1600' for the float switches. Lastly, if you are ever worried about the head, the Lorentz pumps can pump up to 760' --more than double the recommended for Grundfos.
I highly recommend Genpro Energy Solutions as a pump distributor for both of those brands. They always answer the phone, are personable and return emails (hint, hint Conergy)! Best, Mark Dickson Oasis Montana Inc. <http://www.oasismontana.com/> <http://www.oasismontana.com/> www.oasismontana.com www.grid-tie.com <http://www.grid-tie.com/> <http://www.pvsolarpumps.com/> <http://www.pvsolarpumps.com/> www.PVsolarpumps.com _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan Sindelar Sent: Thursday, June 11, 2009 2:28 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Design help for solar water pumping application Lee, You can get Grundfos' WINCaps software from your RE or pump supplier; some will run the sizing for you (Jeremy at Conergy does for us). I didn't check your head and flow, but I would expect that's about your only good pump choice at that head. Add a tracker if you need greater summer output; don't attempt batteries as a solution. If usage occasionally exceeds output, add an IO101 control and allow the pump to run off any AC source at night. A tiny 1,200W inverter/generator will work at sea level. Use a CU200 controller to allow a float or level detector switch to turn off the pump when tanks are full. Mercury-based float switches last longer in signal circuits that carry no current. If you can't use a float switch because the lines are already buried, look into www.P2Flow.com <http://www.p2flow.com/> for pressure transducer-based control. Read the website info, then call Britt there with your specific application. That array sounds oversized, as the pump draws a maximum of 900 watts. Hope this helps. Allan Sindelar <mailto:al...@positiveenergysolar.com> al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer EE98J Journeyman Electrician Positive Energy, Inc. 3201 Calle Marie Santa Fe, New Mexico 87507 505 424-1112 <http://www.positiveenergysolar.com> www.positiveenergysolar.com _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Lee Bristol Sent: Thursday, June 11, 2009 1:26 PM To: RE-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Design help for solar water pumping application Solar Water Pumping Wrenches, We normally don't do solar water pumping but a friend asked for some help designing his system. He has one well and two 5,000 gallon reservoirs to fill up. The average usage is expected to be about 2,000 gallons per day but may be higher in the summer. The tanks will have level detector switches to sense when the tank is full. The site is near Leesburg, VA. The problem is to design a control system to turn on the pump when one or both of the tanks needs water and to shut it off when both are full. The closest tank has a head requirement of 200 feet (pump to tank) and is 300 feet from the well head. The second tank head requirement is 220 feet and it is 3,000 feet from the well. The pipes are expected to be 1.25 or 1.5 inch. A Grundfos SQFlex 6 SQF-2 pump with 1.36 KW solar was recommended, 360 foot head, 360 gph. I think that this would provide the lift but not the quantity. Hmmmm, what valves and controls would you all suggest? Thanks! Lee -- Lee Bristol NABCEP Certified Solar Designer/Installer Chief Technology Officer Standard Solar, Inc. 202 Perry Parkway, #7 Gaithersburg, MD 20877 (301) 944-5105 (240) 479-1510 (c) www.standardsolar.com
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