Confirmation of 100% duty cycle, OB breakers [RE-wrenches]

[Christopher Freitas --- OutBack Power]

Phil - 

Sorry for the delay - I was out of the office last week.

All of the breakers used on in the OutBack products are 100% rated  
hydraulic-magnetic type breakers EXCEPT where we have used the square-D 
breakers in the AC bypass assemblies (which are being replaced with the 
new FLEXware systems which use only the OutBack/CBI type breakers.  

We did run the 100% approval tests on the PSPV with the box completely 
loaded with 15 amp breakers carrying a total of 180 amps DC through it 
(a total of 12 breakers @ 15 amps each).  So it is not an issue there.  

We also did testing on the DC versions "PS" enclosures for 100% testing 
but it was not as thorough as what we did on the PSPV.  Since the AC 
versions of the "PS" enclosures did not have all 100% rated breakers in 
them we did not test these versions at all.  

So - the bottom line is that the PSPV is acceptable for 100% duty use - 
the PS2/PS4 DC enclosures and somewhat.  We are starting to ship the new 
FLEXware enclosures versions and we are completing the 100% testing on 
them - both the AC and DC versions.  

Althought the hydraulic/magnetic breaker's trip level are not affected 
by the breaker's temperatures - the breakers will get warm which could 
cause the terminals of the DC breakers reaching the temperature rating 
of the cable and terminals involved. We do not pack in as many breakers 
together in the DC enclosures so I have not seen temperature rise to be 
a big deal in my experience.  The AC boxes might be where temperature 
issues occur - but most systems can live with a 80% dearte if required.  


I will follow up on this once we complete the tests - probably next 
week.

Christopher 
 
pundercuffler wrote:
> 
> Christopher,
> 
> Can you help clarify an issue that arose during a John Wiles training 
> yesterday?  
> 
> Are the OBDC, OBAC and OBPV breakers rated for 100% duty cycle as 
> mounted in their enclosures? 

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


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