[RE-wrenches] Grundfos SQ Flex

Dana dana at solarwork.com
Wed Apr 6 14:18:08 PDT 2011


As I understand the 2 wire at 240VAC is the neutral is
handled through the ground & well water. I have always
questioned this as it would make the ground current carrying
& have never gotten a good answer.

 

Some wrench enlighten us on this, please.

 

Dana Orzel

Great Solar Works, Inc

E - dana at solarwork.com

V - 970.626.5253

F - 970.626.4140

C - 970.209.4076

web - www.solarwork.com

 

"Responsible Technologies for Responsible People since 1988"

Do not ever believe anything, but seriously trust through
action.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of Roy Butler
Sent: Wednesday, April 06, 2011 3:07 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Grundfos SQ Flex

 

Kirpal,

Although I can't answer your IO101 question, I can tell you
that the SQ Flex operates nicely for us 
when used with a pressure tank/ pressure switch. As long as
the pump and PV power source are
sized to accommodate the additional vertical lift caused by
the tank pressure, all is good.

As for the 2 current carrying conductors, that still
fascinates me. When using 240 AC, the 2 phase
wires from the grid are attached to the blue and brown wires
from the pump. 

When switched over to the array, the DC positive and
negative are attached to the same brown and blue
wires but the polarity doesn't matter. It's all taken care
of by the electronics in the pump. Takes a while
to get used to that.

And have you seen the documentation that comes with the pump
and CU200? I'm embarrassed to include
them in the customer's document package...they're all
pictures and no text....sigh....



Roy Butler
NABCEP Certified Solar PV InstallerR
NYSERDA eligible PV & wind installer
PA Sunshine Program Approved PV Installer
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
 
www.four-winds-energy.com
 
Although no trees were killed in the sending of this
message,
a large number of electrons were terribly inconvenienced.
 


On 4/6/2011 4:55 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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