Hi Windy,
I have a question about 3 phase pumps but slightly off topic for this
thread. I have a Lorentz pump I bought from you 18 years ago and is at 480
feet and my well will only
give me 1 gpm with occasional air coming up . I replaced the control board
3 years ago and it had been working fine. It quit a few months ago right
when we were getting into a drought here in Vermont. How can I be sure it
is a controller issue and not the pump itself. My spring has dried up and
I am now pumping from my other building and another spring 800' away using
a Shurflow 12v pump. It is not doing well. You mentioned a Lorentz
distributor which triggered me to jump in here. Is there a way to
determine if the pump is good with resistance test of each leg? Or leg to
leg with wires disconnected from controller?
John Blittersdorf
CV Wind Service (and Solar)
On Thu, Sep 20, 2018 at 9:15 PM Windy Dankoff <[email protected]> wrote:
> Mac — Jay has a good suggestion of the Grundfos RSI. There are other
> companies making “solar pump inverters” to run standard 3-ph. pumps. And,
> that IS the way to go for systems of this size.
>
> Another supplier in USA is SunPumps. Another is GenPro (Lorentz
> distributor).
>
> How to compare them? The inverter will represent a small proportion of
> the system cost, so I would have to ask each prospective supplier to
> produce a system design for you. Compare them carefully in regard to how
> they are expected to handle less-than full sun conditions. Also “bells and
> whistles” can be extremely helpful, meaning data-logging and remote
> connectivity and control features. Another rare feature is the ability to
> handle both solar and backup power sources, not merely by transfer switch
> or relay but by blending them with solar priority.
>
> Lorentz has been the leader in these features, but others have been
> catching up. I hope you (and others) will report back about your findings!
> I’m still researching this field form my upcoming book.
>
> Windy Dankoff
> Author, Consultant
>
> http://www.windydankoff.com
>
> Specialist in solar-electric applications & solar water pumping
> Education <> Industry support <> Since 1975
>
> Co-author *Solar Water Pumping* (Taylor & Francis, *Earthscan *London)
> for publication in 2019
>
>
> *From: *Jay <[email protected]>
> *Subject: **Re: [RE-wrenches] High Volume Solar Pumping*
> *Date: *September 20, 2018 at 11:24:39 AM MDT
> *To: *RE-wrenches <[email protected]>
>
>
> Mac
> Look at the grundfos RSI
>
> It’ll go up to 37kw for standard 3 phase pumps.
>
> At 37kw it’s 480 3 phase output and 1000vdc input if I remember correctly
>
> Jay
>
>
> On Sep 20, 2018, at 3:01 PM, [email protected]
> wrote:
>
> *From: *Mac Lewis <[email protected]>
> *Subject: **[RE-wrenches] High Volume Solar Pumping*
> *Date: *September 20, 2018 at 11:04:21 AM MDT
> *To: *RE-wrenches <[email protected]>
>
>
> Hello Wrenches,
>
> This is a larger volume pumping application than I have designed before so
> I'm trying to head in the right direction.
>
> We need ~ 144,000 gallons per day
> Head is ~70'
>
> We'd like to do this via a surface pump(s) if possible.
>
> Do you know any equipment that may be able to do this volume per day?
>
> Thanks in advance
>
> --
>
> Mac Lewis
>
>
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