[RE-wrenches] Grundfos SQFlex

[Allan Sindelar]

Ron, 
Brian's advice is sound. 

240 vac is fine for the pump and the CU 200. The SQ series is rated 90-300 v AC and 30-300 v DC, although the pump is happiest at around 90 v and up.  If the CU200 is already in the system and paid for, keep it: the diagnostics are nice, and the signal circuit is nicer: without it you must independently control the AC input. 
Allan Sindelar
als at sindelarsolar.com

> On Oct 20, 2014, at 8:34 PM, Brian Teitelbaum <bteitelbaum at aeesolar.com> wrote:
> 
> 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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