Inverter/Battery Question (Round 2 well pumping) [RE-wrenches]

[John Raynes]

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Windy,

We have a 1-1/2 horsepower conventional AC pump in a well on some property 
we own, and we have a working 3-wire start.  (I say "working" with some 
certainty, since I had to troubleshoot the thing this past season, when the 
pump was tripping out the breaker due to a silt slug that it had to 
clear.  This is an infrequently used well.)   So if I understand what 
you're saying, your comment about 3-wire starts only applying to 1/2 or 1/3 
HP is incorrect.

In fact, my experience with AC motors in general, of all sorts, is that 
starting windings/circuits become more common as you go up in size, because 
the real magnitude of the starting amperes involved becomes more and more 
of an issue in any given application.

And the start-up surge on our well pump, when working properly, seemed to 
be nowhere near 8X on the 3-wire start, maybe more like 1-1/2 to 2X, 
although I might not have been grabbing the absolute peak, I can't remember 
for sure.  But I doubt that our Honda 5KW genny would ride through an 8X 
surge on the 1-1/2 HP pump, given the way that it belched and wheezed while 
the pump was in the process of clearing the silt slug.

John Raynes
RE Solar
Torrey, UT


At 11:35 AM 1/20/2006 -0700, you wrote:
>And yes, a 3-wire draws less start surge but that means about maybe
>8X surge instead of (with a 2-wire pump) maybe 15X surge! So don't
>look upon a 3-wire as anything special. In fact, they are only made
>for 1/2 and maybe 1/3 HP, for low-end market.

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