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

[Windy Dankoff]

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Dave,

Through careless grammer, I said 3-wire is made only in 1/2 and maybe  
3/4 HP -- I meant to say 2-wire. In other words 3-wire IS most  
"standard".

And yes, the Grundfos SQ has only 2 wires (not counting ground) but  
it is not a normal induction motor like traditional AC well pumps. It  
has electronic slow-start. It converts power to DC, then inverts it  
to variable frequency 3-phase. It brings the speed up gradually in  
about 10 seconds.

So it doesn't fit the normally defined distinction of 2 or 3-wire  
pump. Its structure and behavior is completely different.

Windy


> From: "David Palumbo" <ipl at sover.net>
> Subject: RE: Inverter/Battery Question (Round 2 well pumping) [RE- 
> wrenches]
>
> Windy said
> "A 2-wire pump is very undesirable."
>
> For clarification purposes, and for the education for those of us  
> who do not
> deal with water pumps on a regular basis,
> isn't the Grundfos SQ pump a 2-wire pump? I know it is different  
> (variable
> frequency electronics in the pump), but when I connect them there  
> are only
> two wires plus a ground.
>
> Everything else Windy says sounds correct to me.

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