Need help selecting an inverter [RE-wrenches]

Tue Oct 28 12:14:13 PST 2003

Darryl Thayer wrote:
> One strange thing, the surge on line power is 130
> amps, by my peak hold greenlee clamp on.  When I start
> from the inverters the peak hold is only 100 amps? 
> strange because you can not tell the difference in the
> pump starting!

This is due to the built-in 50 amp RMS AC output current limit of the 
OutBack inverters. Each unit is putting out around 6000 watts when this 
occurs (for a total peak of 24,000 watts AC - wow!).  Under most 
conditions the AC RMS voltage will not drop much when this occurs as we 
typically are only current limiting at the "peaks" of the AC waveform. 

> I forgot to mention that during testing I tried the
> same things with only three inverters connected, it
> also worked perfectly. I am very happy I installed
> the quad stack, because the customer would have been
> very up set if I failed again. As it is he has
> recommended me to a friend.

This is a great way to verify the margin you have left in the system - 
which is worth having on hand for future growth or tempeorary loads such 
as tools. 

It also demonstrates how the OutBack's can handle non-synmetric AC 
loading without problems because of the autotransformer balancing 
"trick" which shifts the AC loads around to balance the three inverters 
(two paralleled at 120 VAC on L1 in series with a third one on L2 - 
crazy sounding, but it works).   

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

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