Trace Charge Controller Ratings [RE-wrenches]

[jberdner at sma-america.com]

William:

You can't beat a Class T fuse for over current protection.
> 100 kAic and incredibly fast opening during a short circuit.
The old APT power centers had class T fuses because they were the best.
When the DC 250 came out we definitely  
Breakers have their place but for the ultimate in safety the proper fuse
is always better.
This is  one of the reasons the Code doesn't allow you to protect a
breaker with a breaker.
They do allow you to protect a breaker with a fuse though.






-----Original Message-----
From: William Miller [mailto:wrmiller at slonet.org] 
Sent: Wednesday, April 24, 2002 12:40 PM
To: RE-wrenches at topica.com
Subject: Re:Trace Charge Controller Ratings [RE-wrenches]


Colleagues:

I am building a custom combiner.  I need to take the output of 5 PCB-10
combiners and combine them to feed a battery bank.  In searching for
Heinemann breakers I came across the Home Power article about high
ampacity circuit protection (Over Current Protection for Battery Powered
Systems, HP27-26.pdf).  I am still wondering how Trace gets away with
using only the Heinemann breakers as primary protection. While the
breakers are rated at 25,000 AIC for DC circuits, who wants their
equipment to handle that current for the delay time required to trip
this breaker?

The combiner I am designing will have a class T fuse behind the
dead-front.  I will route battery power through a Heinemann breaker to
the class T fuse, using the breaker as a disconnect switch for fuse
replacement.  The fuse will "back protect" the Heinemann breaker.  This
concept is diagramed below in ASCII-CAD:

Batt-----Heinemann----Class T-----Power distribution block------5 QOU
breakers-----5 PCB-10----20 string arrays

The lead between the Heinemann  and the fuse is no longer than 15 CM and
both components are in the same enclosure.

I appreciate any comments as to the suitability of the Heinemann
breakers as utilized by Trace and on my design philosophy.

William Miller



At 10:06 AM 4/24/02 -0700, you wrote:
>
>Thanks for forwarding John Wiles' feedback. A practical and reasonable 
>interpretation. Is the DC 175/DC 250 Disconnect from Xantrex rated 
>100%? There is no indication on the enclosure (or in the instructions)

>that it is rated 100% and that is what the inspector wants to see.
>
>Eric Smiley - Project Leader


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