Pressure switch for Grundfos 11 SQF-2 with CU200??

zzrider
zzrider Registered Users Posts: 2 ✭
in General Solar Power Topics #1
I can't be the only one....

I'm going to be installing an 11 SQF-2 pump and using a CU200 controller.  Input power will be 120 VAC from an inverter (off-grid system).

I want the pump to feed a conventional domestic pressure tank and have the pump controlled by a standard 40-60 psi pressure switch.  

The CU200 has an input for a level switch - can I connect these Inputs to normal pressure switch like is used in typical pump setup?

Who else is using a pressure tank & switch with an SQF and CU200, and WHAT are you using?
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  • Miller_Ranch
    Miller_Ranch Registered Users Posts: 52 ✭✭
    edited September 2023 #2
    I am running a Grunfos SQ 1/2 hp 10gpm pump into pressure tanks. It is a 120 volt pump with soft start. I have it wired just with a pressure switch. Don't know why you would need the cu200 controller.

    If you are only going to be running the pump from 120 power you do not need the SQF.
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  • Dave Angelini
    Dave Angelini Solar Expert Posts: 7,057 ✭✭✭✭✭✭
    #3
    Miller is right unless you need the adjustability of SQF with a controller.
    "we go where power lines don't" Sierra Nevada mountain area
       htps://offgridsolar1.com/
    E-mail offgridsolar@sti.net

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  • JRHill
    JRHill Registered Users Posts: 469 ✭✭✭✭
    #4
    I too use the 11 SQF-2 and have the CU200 and the IO101 to fill two 80g pressure tanks. Originally I thought the CU200 was necessary for the fancy capabilities of that pump. Nope. Just a standard well pump pressure switch is all I needed. So much simpler/less complexity and less to go wrong. The house inverter could care less about the small load from that pump.
    Off Grid. Two systems: 1) 2925w panels, OB VFXR3648, FM80, FNDC, Victron BMV-712, Mate3s, 240 xformer, four SimpliPHI 3.8; 2) 780w, Morningstar 30a, Grundfos switch, controller and AC/DC pump, 8 T105. Honda EU7000is w/AGS. Champion 3100. HF 4550, Miller Bobcat.
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  • Dave Angelini
    Dave Angelini Solar Expert Posts: 7,057 ✭✭✭✭✭✭
    #5
    There are important reasons to use the controller option. Since we do not know the requirements other than the OP wants a pressure switch, 
    it is pretty hard to give a decent response here. Basing this on hundreds of clients using both methods.
    "we go where power lines don't" Sierra Nevada mountain area
       htps://offgridsolar1.com/
    E-mail offgridsolar@sti.net

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