Constant Pressure pumps are a much better choice off grid. No starting
surge is huge, and the power draw is related to the water flow, so at
low flow rates, the power is only a fraction of full run watts.
Pressure switches and P tanks are archaic. The variable pressure and
the light dimming surges are very 20th century, and we have a
responsibility to bring off grid into the 21st century. Efficiency
isn't much different, and frankly just isn't that important unless you
are irrigating.
R. Ray Walters
Chief Technical Officer, RemoteSolar.com
BS Mech Engineering, 1988
Former NABCEP Certified, 2004-2016
Licensed Master ELectrician, Colorado
303 505-8760
On 4/27/17 4:48 PM, Bradley Bassett wrote:
Dana,
For off grid you may not want to use the constant pressure pumps. They
will run a little bit, a lot of the time to keep the pressure
constant. I think it might be more efficient to use a pressure switch
and regular pressure tank. Anyone with experience in this?
Brad
On Wed, Apr 26, 2017 at 8:32 PM, Dana <[email protected]
<mailto:[email protected]>> wrote:
My well driller-well pump guy is offering Sta-Rite pumps
manufactured by Pentair [as in Pentair water filtration they seem
to be buying lots of water related companies].
I am curious as to feedback on these, has anyone used them?
Soft start, digital controls, easy programming, stainless steel,
3-year warranty, & includes a pressure transducer, so no pressure
switch required.
My pump guy says he has only had 1 issue on 1 pump in serval
hundred installed. Almost sounds too good to believe.
A bit less $ retail than a Grundfoss but supposedly a whole lot
more reliable.
A 1 HP motor 20 GPM pump draws 4.7 Amp/240 VA as it hits a 60 psi
cutout [1,128 watts peak] though I will set to 30/50 psi.
Comments please…
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Dana Orzel Great Solar Works, Inc.
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Idaho Contractor - # 028765 Idaho PV # 028374
NABCEP # 051112-136 www.solarwork.biz <http://www.solarwork.biz>
_"Responsible Technologies for Responsible People since 1988" ___
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