[RE-wrenches] Low flow high head pump

[Kirpal Khalsa]

Hot damn Brian! You are clever!  Great ideas!
On May 7, 2014 4:46 PM, "Brian Teitelbaum" <bteitelbaum at aeesolar.com> 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: re-wrenches-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at lists.re-wrenches.org] 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 <bteitelbaum at aeesolar.com>
> 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: re-wrenches-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of All Solar, Inc.
> > Sent: Tuesday, May 06, 2014 5:08 PM
> > To: re-wrenches at 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!
> > _______________________________________________
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