Submersible Pump Advice [RE-wrenches]

[Doug Pratt]

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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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