Trace Charge Controller Ratings [RE-wrenches]

[Travis Creswell, Ozark Solar]

I used to know...but can't remember for sure anymore.  I think one of the
1.25 de-rates comes from the ability of ambient to get down to -5 degrees
and the second is the continuous duty de-rate. 

Check out Table 690-7 of the 1999 NEC handbook for the voltage correction
factors.
Also check out 690-8 (a)(1) for PV Source Circuit Currents for another 1.25
de-rate.
And if that wasn't enough check out 690-8 (b) for another 1.25 de-rate. 
Take your pick.  Now that I think about I think the low temp correction
factor for voltage isn't part of the 1.56 de-rate that everyone uses.


Travis Creswell
Ozark Energy Services
----------
>From: William Miller <wrmiller at slonet.org>
>To: RE-wrenches at topica.com
>Subject: Re: Fw: Trace Charge Controller Ratings [RE-wrenches]
>Date: Tue, Apr 23, 2002, 3:12 PM
>

>>
>>----- Original Message -----
>>From: "John Wiles" <jwiles at nmsu.edu>
>>
>>However, in PV source circuits, we do have the 1.25 imposed on these 100%
>>duty devices because the irradiance can and frequently does go above 1000
>>watts per square meter for several hours around solar noon.
>
>So, does this mean that the fabled 1.56 rating is just a fable?  I've seen
>that figure used frequently on this list but apparently no one knows where
>it comes from?!?
>
>William Miller
>
>
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