[RE-wrenches] Grundfos SQ Flex

Wed Apr 6 17:58:48 PDT 2011

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
> 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
> 
> 
> 
> 
> 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
>> 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
>> 
>> 
>> 
>> 
>> 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
> _______________________________________________
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