Submersible Pump Advice [RE-wrenches]

[Ray Walters]

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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


>
>Allan, I'd favor the SQFlex solution. They have no problem with mod-sine
>(this is from an engineer at Grundfos, whom my co-worker grilled mercilessly
>for an hour on the subject), and higher voltage transmits easier. The SQFlex
>has proven itself reliable, adaptable, and awesomely efficient. In spite of
>reservations about putting all the electronics down the hole, I've yet to
>hear of any failures (other than letting them continue to run when the
>water's all gone). Anybody had any SQFlex failures that weren't
>externally-caused?
>
>Cheers,
>Doug Pratt
>
>-----Original Message-----
>From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
>Sent: Thursday, December 22, 2005 7:38 PM
>To: New wrenches posting
>Subject: Submersible Pump Advice [RE-wrenches]
>
>
>Esteemed Wrenches,
>And now for something completely different...
>
>Customer lives offgrid with a 1998 24V system: 900W array, SB6024, DR2424. A
>SunRise pump is set at 300' by hand method, run from batteries with a 24-60V
>battery pump controller. Both pump and controller replaced with rebuilt
>units within last 6 months.
>
>Aside: Gary Hegg of Total Light and Power in Pie Town NM, 505 772-5759,
>http://www.solarstraw.com/dankoff.html is servicing SunRise pumps for anyone
>still using them.
>
>Customer is insecure about sticking with the SunRise and has asked for a
>quote for a new system. I'm looking for comparative advice. He wants
>automatic operation off of a float switch, so no AC pumps running off his
>gennie. At this depth, my choices are:
>
>SQFlex, but only running on AC power, as the pump needs at least 30 VDC, and
>the system voltage is 24V. Does the SQF do fine on mod-square power?
>
>Lorentz/ETA, but the 24V mini won't work at 300', and the bigger units don't
>work at 24V, so we would have to work out a relay-based diversion of part of
>the array (which is wired 48Vnom) to run an array-direct controller. We can
>do this, but the trenching for the additional wires wouldn't be pretty.
>
>Any other ideas? Note that the customer's budget prevents big-picture
>solutions like a 48V system upgrade, or even a new inverter.
>
>Thank you for the help.
>Allan at Positive E
>
>Y
>
>
>
>
>  
>

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