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Kirpal,<br>
<br>
Although I can't answer your IO101 question, I can tell you that the
SQ Flex operates nicely for us <br>
when used with a pressure tank/ pressure switch. As long as the pump
and PV power source are<br>
sized to accommodate the additional vertical lift caused by the tank
pressure, all is good.<br>
<br>
As for the 2 current carrying conductors, that still fascinates me.
When using 240 AC, the 2 phase<br>
wires from the grid are attached to the blue and brown wires from
the pump. <br>
<br>
When switched over to the array, the DC positive and negative are
attached to the same brown and blue<br>
wires but the polarity doesn't matter. It's all taken care of by the
electronics in the pump. Takes a while<br>
to get used to that.<br>
<br>
And have you seen the documentation that comes with the pump and
CU200? I'm embarrassed to include<br>
them in the customer's document package...they're all pictures and
no text....sigh....<br>
<pre class="moz-signature" cols="72">Roy Butler
NABCEP Certified Solar PV Installer®
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
<a class="moz-txt-link-abbreviated" href="http://www.four-winds-energy.com">www.four-winds-energy.com</a>
Although no trees were killed in the sending of this message,
a large number of electrons were terribly inconvenienced.
</pre>
<br>
On 4/6/2011 4:55 PM, Kirpal Khalsa wrote:
<blockquote
cite="mid:BANLkTin958JiVuHJu8MUsae7i5tFOCfPjQ@mail.gmail.com"
type="cite">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...<br>
5-Sanyo HIT 220's Vmp non temp adjusted is 213VDC<br>
Pump is SQFlex 16 SQF-10 will have CU 200 controller and IO101 AC
input box....<br>
<br>
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....<br>
This system is a retrofit project to an existing well pumping
system......<br>
Here is my questions:<br>
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....<br>
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?<br>
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?<br>
Grundfos does not offer tech support.......that is kind of a
bummer....<br>
Thanks for any advice or help....<br>
<br clear="all">
<br>
--<br>
Sunny Regards,<br>
Kirpal Khalsa<br>
NABCEP Certified Solar PV Installer<br>
Renewable Energy Systems<br>
<a moz-do-not-send="true" href="http://www.oregonsolarworks.com">www.oregonsolarworks.com</a><br>
541-218-0201 m<br>
541-592-3958 o<br>
<pre wrap="">
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