[RE-wrenches] Grundfos SQ FLEX AC/DC auto switching

Mark Dickson Mark at OasisMontana.com
Fri May 21 08:31:28 PDT 2010


Our Grundfos pump distributor has always warned against using the SQF pumps
in pressure pumping situations.  I can't quite remember why, but you may
want to check into that.  The Lorentz HR's have been the choice in these
situations.

 

Best regards,

 

Mark Dickson,

NABCEP Certified Solar PV Installer T

Oasis Montana Inc.

 

 

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From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kent
Osterberg
Sent: Thursday, May 20, 2010 5:18 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Grundfos SQ FLEX AC/DC auto switching

 

Kirpal,

None of the SQFlex equipment is UL listed.  You may find that your AHJ won't
approve any of the SQFlex controls and possibly not even the pump.

Kent Osterberg
Blue Mountain Solar


Kirpal Khalsa wrote: 

Hi Folks.....I am working on putting together a domestic water pumping
system using a grundfos 11 - SQF - 2.  This system will be connected to a
standard pressure tank and cistern and have a solar array providing primary
power.  However at night and on cloudy days we would like the system to
switch back over to AC power from the grid.  I know that the grundfos IO 101
switch box allows the pump to use an AC source and when the AC source is
removed it automatically switches back to DC.  What I am looking for is when
the DC source (solar) is not available it automatically switches over to AC
power (grid) ( the reverse of what the IO 101 switch does)  and when the DC
becomes available again it again automatically switches back to the DC power
(solar).  

Has anyone done this?  Any recommendations for configuring this set up.  We
are looking to provide solar water pumping during the day both when grid is
present and when their is a power outage and AC pumping at night or cloudy
weather all without battery back up.

Thanks in advance for any advice.!

-- 
Sunny Regards,
Kirpal Khalsa
NABCEP Certified Solar PV Installer
Renewable Energy Systems
www.oregonsolarworks.com
541-218-0201 m
541-592-3958 o

 





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