[RE-wrenches] Grundfos SQFlex

[Brian Teitelbaum]

Hi Jay,

You are correct about the CU-200. It has an operating voltage range of
30-300 VDC and 90-240 VAC.

However, the IO-101 transfer switch is another story, and I think that is
what Ron meant. Up until recently Grundfos was only importing the 120 VAC
version of the IO-101, but now you can get the 240 VAC version here also
(it's basically the European 230 VAC model).

One thing to note though with the IO-101 is that its max DC voltage is only
225 VDC (even though the pumps and CU-200 are good for 300 VDC), so make
sure the PV array it's connected to is below that.

Brian
AEE Solar

-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of jay peltz
Sent: Monday, October 20, 2014 6:37 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Grundfos SQFlex

Hi Ron

Where did you read that the CU 200 is only good for 120vac. The manual I see
shows 240vac 50/60hz?

Jay
Peltz power.




> On Oct 20, 2014, at 6:21 PM, "Ron @ earthRight Solar"
> <solareagle at solareagle.com> wrote:
>
> Hello water pumping Wrenches, I have a customer who has a Grundfos SQFlex
> 11 pump and he is getting connected to the grid. He will still have his
> battery back up charged by PV and wants to look at the most efficient way
> to operate the pump. It seems to me that neither the IO101 or the CU200
> really is needed and he could just wire directly to the inverter output at
> 240v via a pressure switch on a standard pressure tank for most efficient
> operation. Although this doesn’t give any access to the Grundfos built in
> diagnostics that display on the CU200.
>
> Would you recommend keeping a CU200 in the system or is it overkill? With
> the CU200 the max voltage is 120 whereas without it I can go with 240v and
> a more efficient operation… unless I am missing something.
>
> Ron Young
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