1.5 HP well pump [RE-wrenches]

[Matt Tritt]

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Hi Travis,

Just to flog this dog a little more, a few years back I had a completely 
confusing talk with the the head "engineer" at (the now defunct) Hayes 
Pump about running their "constant pressure" pump with an SW; something 
way better than a DR presumably, but still with not that many steps per 
wave. I was finally informed that it couldn't be done because their pump 
has some kind of inverter actually built into the motor housing. His 
logic was "you can't run an inverter with an inverter". How he knew this 
to be the case, I have no idea - and he might have been just guessing.

Assuming that the SQ and SQE also have use something similar to make 
variable speed possible with a 240 VAC pump motor, I would assume that 
my suggestion to use one of these pumps with a pair of DRs is pretty 
lame. Rats. I also hate it when I'm wrong.

On the other other hand, I bet the system in question would work fine if 
they could simply change to a conventional 3/4 HP pump.

On another topic altogether; I would like to understand (as they say in 
the news biz) why some people think that the new energy bill was such a 
big win for solar? The way I read it (not that reading such a thing is 
even possible), we in the alternative energy field, and the planet in 
general, are getting short shrift compared to the Nooqular, coal, oil 
and gas people. A 2 year sunset for residential? Cool! The biggest 
pither for me, however, is the total omission for small wind. 
Unbelievable. Big wind did well, but that gang is basically just Big 
Business, and not without some drawbacks.

I should be nagging AWEA about this, but they quite obviously are firmly 
in the camp of Big, since they get most of their money from them, not us 
itty-bitty residential turbine people. So why bring this up on the 
wrenches list? Because wind is simply a product of solar radiation and 
should, by rights, be lumped into the same category, not treated like 
some step-child with bad breath.

Rant over.

Matt T

Travis Creswell, Ozark Solar wrote:

>Hi Matt,
>
>I've used quite a few of the SQ Flex's and I they are great.  ZERO problems
>to date.  I won't even consider DC pumps now.  I'm sure Todd knows about
>them as well.  My guess is the budget won't allow that.  But I'm not sure
>about running them with a DR.  The folks at Grundfos might have assumed that
>would be a possibility and designed for it.  My suggestions were just
>good'ol common sense stuff of how I would go about trouble shooting the
>existing pump.
>
>I wouldn't get rid of the old pump until all of the variables had been
>detailed and problems resolved.  There might be something else going on and
>probably is.  These types of issues often are the sum of several problems.
>That kind of surge will bring out the problems fast. And Todd's exactly
>right about that being an awful design to begin with.  The square wave of
>the DR actually would add to the running amps and I would assume the
>starting amps.  Windy could answer that.
>
>Have a good one,
>
>Travis Creswell
>Ozark Energy Services
>
>-----Original Message-----
>From: Matt Tritt [mailto:solarone at charter.net] 
>Sent: Monday, August 08, 2005 10:11 PM
>To: RE-wrenches at topica.com
>Subject: Re: 1.5 HP well pump [RE-wrenches]
>
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>
>Hey Todd and Travis,
>
>Another way to solve this problem might be to replace the pump with 
>something a little easier to handle, maybe like a Grundfos SQ or SQE 
>with variable speed/constant pressure. This way you can avoid the 
>(absolutely necessary) storage tank and added pressure pump costs, not 
>the least of which will be the labor. I don't know how they would work 
>with the squarewave, but it wouldn't hurt to ask Grundfos about it.
>
>Matt T
>
>
>
>  
>

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