T-240 circuit problem [RE-wrenches]

[Christopher Freitas - OutBack Power]

EH Roy wrote:

> I'd suggest replacing the switch. I think this is more likely the 
> problem than the transformer.

I also suspect the switch is chattering when closing or opening and 
causing the problem.  Transformers need a clean on and off switching or 
they can "saturate" and make nasty noises and cause other problems.  

Try running the pump on the inverter without the switch or with the 
switch wired to the 240 vac side of the pump.  If the problem goes away 
then it is the switch not the transformer.  

Using both poles of the switch is a good idea - but I usually put them 
in series instead of parallel for 120 VAC.  A "dual break" series 
connection can reduce the pitting and arcing of the contacts.  This 
assumes of course that the switch is rated to handle the 120 vac current 
draw.

Also - running an inverter from another inverter is not a problem - most 
devices like motordrives just immediately rectify the AC back into DC 
anyways before it is actually used. We "burn-in" all the FX inverters 
here at OutBack every day by having one FX run as a charger off another 
FX operating as a inverter on the same battery bank. Its more efficient 
than buring up the power of an inverter in an AC load bank.    

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

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