Kirpal,
Neither the SQFlex pump nor its accessories are UL listed. That can
lead to some serious difficulties with the AHJ. Fortunately the pump
can operate without any of the accessories -- neither the IO101 nor the
CU200 is required. Murray, Siemens, Square D, and others make 250-Vdc
30-amp two-pole safety switches that may be used to select ac or dc
power instead of the Grundfos switch. You might be pushing your luck
operating the pressure switch at 213 VDC.
Kent Osterberg
Blue Mountain Solar
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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