Hot damn Brian! You are clever! Great ideas! On May 7, 2014 4:46 PM, "Brian Teitelbaum" <[email protected]> wrote:
> Jeremy, > > A Grundfos SQFlex model 3 SQF-3 will run on just two 250W 60-cell modules > in series. At 600 feet of head, with 500W of PV, it will do just about 1 > gpm at noon peak. > > However, if the static level is 200 ft in a 600 ft deep well, you have a > lot of water storage sitting in the well casing. That will allow you to > pump at a rate above the well's underground inflow for some period of time. > A 4" well casing holds about 0.6 gallons per foot. The pump will start out > only having 200 ft of head, so it will pump at a faster rate, but as the > water level drops, the flow-rate will drop off. Hopefully it will reach > equilibrium, or the tank will be full, before the pump runs dry. And of > course, the amount of sunlight will decline as the day gets later, slowing > down the delivery rate, so it may not be an issue at all. The SQF pumps > have a low water sensor that will shut the pump off if it does run out of > water. If you find the pump shutting off due to low water before the day's > sunlight is over, you can also just turn the PV array away from due south > to limit output. > > Another strategy to control pump flow rate is to drill a hole in the pump > output piping to allow some of the pumped water to flow back into the well, > reducing delivery. Or just install a tee in the pipe above ground, put a > valve on it (gate or ball valve), and run a pipe from the valve back into > the well. That way you can adjust the valve to get the exact bypass needed > for delivery flow control. > > Brian Teitelbaum > AEE Solar > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of All Solar, Inc. > Sent: Wednesday, May 07, 2014 2:28 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Low flow high head pump > > Static level is 200 feet > Well produces ~1 gallon per minute. 4 inch casing. > 200 gallons per day requirement > > 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! > > > On May 6, 2014, at 6:43 PM, Brian Teitelbaum <[email protected]> > wrote: > > > > 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: [email protected] [mailto: > [email protected]] On Behalf Of All Solar, Inc. > > Sent: Tuesday, May 06, 2014 5:08 PM > > To: [email protected] > > 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: [email protected] > > > > 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: [email protected] > > > > 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: [email protected] > > 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: [email protected] > > 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 > >
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