Submersible Pump Advice [RE-wrenches]

[Matt Tritt]

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Yep. We just pulled one that starting behaving badly after about 3 mos. 
in the hole. It had constantly puslating and poor flow. Both the PV 
input and grid power tested fine. Just a bad pump.

Matt T

Doug Pratt wrote:

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>
>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
>
>
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