[RE-wrenches] Grundfos SQ Flex

Wed Apr 6 18:35:10 PDT 2011

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 <jay at 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 <allan at positiveenergysolar.com>
> *To:* Kirpal Khalsa <solarworks at gmail.com>
> *Cc:* RE-wrenches <re-wrenches at 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*
> *Allan at positiveenergysolar.com* <Allan at 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 <
> allan at 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*
>> *Allan at positiveenergysolar.com* <Allan at 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
>>
>>
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>
>
> --
> 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 at lists.re-wrenches.org
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