All, In a 240V mode, you have 2 hots, no neutral, and a ground. Current flows from hot to hot, no current flows on the ground (unless there is a problem). You could easily use the same two wires with the D.C. feed (positive and negative), and the ground wire does the same thing. I have also seen multiple failures of the Grundfos control boxes, and low water sensor.
Mike Nelson MD Electric & Solar, Inc. Gualala Ca. On Wed, Apr 6, 2011 at 5:58 PM, jay peltz <j...@asis.com> wrote: > Hi Nathan, > > The SQ Flex will take AC or DC voltage. > I suspect your issue is with the CU200 which have a lot of failures. > > jay > > peltz power > > On Apr 6, 2011, at 4:48 PM, Nathan Jones wrote: > > Allan, > I seem to recall the SQ Flex pumps will run on 90VAC to 240VAC. I had > several lengthy talks with the engineers in the KS. City office re. the > failure to stop on command situation. While they were helpful with some > aspects they completely denied the situation we were experiencing existed or > could exist. This despite the fact that I had stood there and witnessed the > event happening real time. They wanted me to take a picture of the > controller with the pump running and send it to them?????? We finally opted > for a pressure switch to actually break the current to the pump as the CU200 > stop command was being ignored by the pump. I don't think I know of any of > the installs around here actually seeing the 240AC though but I think it was > one of the engineers there who I discussed it with. > Nathan Jones > Power Source Solar > > > ------------------------------ > *From:* Allan Sindelar <al...@positiveenergysolar.com> > *To:* Kirpal Khalsa <solarwo...@gmail.com> > *Cc:* RE-wrenches <re-wrenches@lists.re-wrenches.org> > *Sent:* Wed, April 6, 2011 6:28:35 PM > *Subject:* Re: [RE-wrenches] Grundfos SQ Flex > > Kirpal, > I have never tried to feed 240V to an IO101, so I don't know the answer. > But as the pump takes a maximum of only 950-1100 watts (approximate here, > from memory). The usual reason for adding an IO101 is to allow a portable > generator to back up a PV array during cloudy weather or a broken pipe, and > the most portable generators are the little 1kW or 2kW inverter-generators, > and the supplied AC pigtail is 15A 120V, so that's all I have ever tried. > Sorry. > > You may have to look at a unit directly. I seem to recall it contains an > Allen-Bradley AC contactor, and you can check the specs on the contactor > directly. > > Sat nam. > Allan > > *Allan Sindelar* > *al...@positiveenergysolar.com* <al...@positiveenergysolar.com> > NABCEP Certified Photovoltaic Installer > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > *Positive Energy, Inc.* > 3201 Calle Marie > Santa Fe, New Mexico 87507 > *505 424-1112* > *www.positiveenergysolar.com* <http://www.positiveenergysolar.com/> > > * > * > > > On 4/6/2011 5:08 PM, Kirpal Khalsa wrote: > > Allan.....According to the IO101 literature it is rated at upto > 265VAC......however in all its wiring "drawings" it only shows one hot, one > neutral and a ground!?? I am puzzled.....? > Kirpal > > On Wed, Apr 6, 2011 at 2:23 PM, Allan Sindelar < > al...@positiveenergysolar.com> wrote: > >> Kirpal, >> I believe that the IO101 is only designed to accept 120VAC, not 240. The >> supplied AC pigtail is 15A 120V, and it uses a contactor, which would be a >> specific voltage only. Unless I'm mistaken, you don't want to supply 220 >> (240) VAC. >> >> I don't have answers for your other questions. >> Allan >> >> *Allan Sindelar* >> *al...@positiveenergysolar.com* <al...@positiveenergysolar.com> >> NABCEP Certified Photovoltaic Installer >> NABCEP Certified Technical Sales Professional >> New Mexico EE98J Journeyman Electrician >> *Positive Energy, Inc.* >> 3201 Calle Marie >> Santa Fe, New Mexico 87507 >> *505 424-1112* >> *www.positiveenergysolar.com* <http://www.positiveenergysolar.com/> >> >> * >> * >> >> >> On 4/6/2011 2:55 PM, Kirpal Khalsa wrote: >> >> Hi all....so I have a pumping project using a grundfos SQ Flex >> pump....It will operate on the grid when grid is present and then switch >> back to solar ready if the grid power should fail.....here is the set up... >> 5-Sanyo HIT 220's Vmp non temp adjusted is 213VDC >> Pump is SQFlex 16 SQF-10 will have CU 200 controller and IO101 AC input >> box.... >> >> System has a pressure tank and pressure switch which will be used instead >> of float switch as there is no storage tank at or above ground level.... >> This system is a retrofit project to an existing well pumping system...... >> Here is my questions: >> 1. Pump and CU 200 controller are rated for upto 300VDC but IO 101 >> Controller is only rated for 225VDC.....is that open circuit or max power on >> the modules.... >> 2. The Grundfos wiring diagrams only show 2 wires and a ground leaving the >> IO101 going to the CU200.....What is happening when there is 240VAC >> supplying the system and what happens when it switches back to DC how is the >> power transmitted on those wires? What happens to the second leg of the >> 240VAC generator/grid input? >> 3. Has anyone done one of these Grundos SQFlex back up water pumping >> systems connected to a pressure tank and did it operate as expected? >> Grundfos does not offer tech support.......that is kind of a bummer.... >> Thanks for any advice or help.... >> >> >> -- >> Sunny Regards, >> Kirpal Khalsa >> NABCEP Certified Solar PV Installer >> Renewable Energy Systems >> www.oregonsolarworks.com >> 541-218-0201 m >> 541-592-3958 o >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> >> Options & >> settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette:www.re-wrenches.org/etiquette.htm >> >> Check out participant bios:www.members.re-wrenches.org >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> >> >> > > > -- > Sunny Regards, > Kirpal Khalsa > NABCEP Certified Solar PV Installer > Renewable Energy Systems > www.oregonsolarworks.com > 541-218-0201 m > 541-592-3958 o > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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