Submersible Pump Advice [RE-wrenches]

[Doug Pratt]

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Ray,
All of Grundfos' pumps are excellent quality. Nothing wrong with sticking to
the SQ-series. But the SQF series has several advantages over the SQ (from
which it was spun-off). The Flex series will accept AC or DC power input.
Any DC source from 30 to 300 volts, or any AC source from 90 to 260 volts,
50 or 60hz is fine. The wide range on the DC makes upgrades easy. Start with
a couple (24v) PV modules. Want more water? Just add another module or two
to the series. PV back-up is easy also. Just plug in any modest size
generator for a few hours, max draw is 900 watts, so even little 1200 watt
generators can run this pump at full output. (The AC/DC switch from Grundfos
is pricy, but any transfer switch will work.)

There's seven different pump heads available for the SQFlex, all the same
price. Three are helical rotor types, at 3, 6, and 11 gallons per minute
max. These are like Conergy's Lorentz, yes, and are by far the most popular.
The 6 and 11 gpm heads will reach 300' lift, the 3 gpm head will reach 550'.
The other heads are hi-volume, lower-lift centrifugal types. 

If you're pushing more than 300' of lift *and* wanting over 5 gpm, this pump
may not be your best choice. But for most folks with average lifts and
modest flow rates it's highly adaptable and reliable.

Now, back to wrapping Christmas...
Cheers,
Doug Pratt


-----Original Message-----
From: Ray Walters [mailto:walters at taosnet.com] 
Sent: Friday, December 23, 2005 6:03 PM
To: RE-wrenches at topica.com
Subject: Re: Submersible Pump Advice [RE-wrenches]


Hi Doug, David, Allan, all;

I've used the Grundfos SQ with 100% success so far running on a variety 
of inverters mostly DRs. What are the advantages & differences to 
running the SQflex instead of the SQ?  The SQ uses a standard 
centrifugal multistage pump head vs. the SQflex uses the rotary positive 
displacement head similar to the Lorentz right? Is the SQ flex more 
efficient then?  I was under the impression that  at  more depth (300 ft 
for instance) that the flow rate was under 5 gpm for the SQflex making 
them more suitable for stand alone array direct pumping.
 For sanitation reasons, I would strongly reccomend a pump with a flow 
rate high enough to pump directly into the house pressure system, and 
skip the cistern and 2nd pressure pump. We've converted a few old 
Sunrise systems to SQ well direct to house setups. We leave the cistern 
and pressure pump for separate rain catch system for irrigation and fire 
protection. By placing a couple of  garden faucets/ boiler drains in 
each system, the 2 separate systems can be plumbed together in an 
emergency with washer hoses, but otherwise they are completely separate 
to avoid contamination. I don't recommend any fancy multi valve systems, 
the customer will screw it up and mix cistern water into the domestic 
water supply. Most cisterns must be treated regularly with chlorine or 
else they harbor E-Colli bacteria. We had a couple relatively clean ones 
flunk bacteria tests much to our embarrassment. We started moving all 
our customers away from cistern water for domestic supply ever since.

Ray

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