Hi Jeremy, PV-direct pumps operate at variable speeds depending on the amount of sunlight and time of day, so a GPM figure is not very helpful in sizing the pump. It's useful info if the water source will not produce more GPM, since you don't want to over-pump the source, but it's not enough info to do proper design.
What are you pumping out of? Well, pond, spring box? How many gallons per day (GPD) do you need delivered, on average? GPD is a much more useful figure for sizing PV-direct pumps. Is that "600 ft" of head measured from the standing water level to the top of the storage tank, as just elevation change and not distance? A 600 foot-deep well might actually have a standing water level at 300-400 ft. Even if the pump is set at 600 ft, it only takes energy to lift water from its standing level, so your head figure would be inaccurate if that is the case. If it's a well, what is the diameter of the well casing? What are the peak sun-hours at the site during the darkest time of year that the water is needed? There are lots of other questions to ask, but these should help a lot. Brian Teitelbaum AEE Solar -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of All Solar, Inc. Sent: Tuesday, May 06, 2014 5:08 PM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Low flow high head pump Hi all, Any recommendations for a low flow, high lift pump, PV direct pump. 1 GPM @ 600 ft of head. Maybe a conventional pump on a timer? Jeremy Rodriguez, President All Solar, Inc. 1463 M Penrose Colorado 81240 719-372-3808 office 719-372-3804 fax www.asolarelectric.com Sent by Jeremy's iPhone. Sorry for typos and shorthand! _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
