[RE-wrenches] Grundfos SQ Flex

[Kirpal Khalsa]

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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