Watts a horse power [RE-wrenches]

[Kurt Nelson]

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This string about the 1.5 HP pump has me asking what seems like a stupid
question, but....

750 watts equals one horse power but does a horse power equal 750 watts?

In one system, I have the largest 1HP SQ pump in a well about 400 feet
deep and operating on a 24 volt system with a VFX inverter (to make
things ore confusing, Grundfos has different sized 1HP pumps in the SQ
line).

In any case, when looking at the Bogart meter, about 100 amps comes out
of that 24 volt battery when the pump is up and running.  I have never
seen any pump operate on anything even close to 750 watts/HP, even when
on utility power.  Watts up with that, are these pumps just that
inefficient?

Thanks for your thoughts -- Kurt

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Kurt Nelson
PO Box 309
Cornucopia, WI 54827
715-742-3406
sunwise at cheqnet.net


-----Original Message-----
From: Todd Cory, Mt. Shasta Energy Services
[mailto:toddcory at finestplanet.com] 
Sent: Tuesday, August 09, 2005 9:08 PM
To: RE-wrenches at topica.com
Subject: Re: 1.5 HP well pump [RE-wrenches]

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"An inverter cannot be run off an inverter"? Why not? I am SURE a SQ 
could be run off an Outback FX. It is way too clean of a sinewave to 
cause any problems. The SQ's electronics wouldn't know the difference.

A followup on the 2500 amp hour 12 volt dual DR1512 inverter / pump 
issues. Once I finally got the batteries fully charged (they were pretty

dead) the DR's amazingly manage to groan that 1.5 HP to life. Running 
amps (DC) were 205 @ 12.3 volts! That is over 2500 watts to run about  
1200 watts worth of pump! Some serious inefficiencies going on there. 
I'd like to meet and talk with the guy that designed that system! How I 
hate cleaning up other people's messes... and yes I did suggest to the 
homeowner they consider a 3/4 HP pump.

On another note, does anyone else run into gigantic well pumps on off 
grid systems? I think the well drillers must make more money on bigger 
pumps or something. I have seen several systems (that I did not do) 
where the folks had to start their generator every time they wanted to 
fill up their pressure tank because the inverter(s) could not start the 
pump. Sheesh! Unless you are irrigating a pasture or something, 3/4 HP 
is plenty.

Todd

Matt Tritt wrote:

> 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.
>
> Matt T

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