OutBack Questions re 3hp well pump [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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Allan - 

You can give certainly give it a try - but I suspect that one OutBack 
inverter will not be able to start it.  The difference between it 
pumping into a pressure tank versus open discharge is pretty minor if 
the pressure switch is set to turn on at a low pressure level.  

I think you will end up needing a second inverter - I would be very 
interested in hearing the results of your testing. I don't think that 
Daryl's issue of soft starting with water bearings is too much of an 
issue - we do what is best described as "reduced voltage starting" and 
not a low frequency / speed ramp-up type start system.  

One additional note on submersible well pumps - always insist on the 
pump being a "three wire type" pump and not the "two wire" versions.  A 
three wire requires a separate starting / control box - but this allows 
more options (such as adding a larger start capacitor and using the old 
fashion relay type boxes).  The two wire versions have the starting 
controls built into the pump itself, making it a little cheaper and 
faster to install - but it makes repair of the starting circuit 
impossible - and I've also heard that they are more lightning sensitive 
as well.  

Its also common for the well drillers to recommend a larger pump than is 
actually required - they seem to carry two sizes in their trucks - big 
and really big.  I often double checked with a local pump supply company 
to see what they thought.  A smaller pump might run longer - but it will 
use less power overall in many situations.  

Christopher


Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  

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