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. _____ From: [email protected] [mailto:[email protected]] 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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