Higher than 48 nom Arrays [RE-wrenches]

[eenergy33 at aol.com]

In a message dated 1/9/04 6:44:08 PM, cfreitas at outbackpower.com writes:

<< As far as using these breakers with 72 vdc applications - I have no 
problem with it - even though the open circuit voltage of the PV array 
in cold temps can exceed 125 vdc - these breakers will handle it - and 
the factory testing I have reviewed and personal experience with these 
breakers confirms this. >>

Christopher,

    Could you also give your opinion of the 125VDC and AIC ratings of the 
Heinemann (sp?) or Airpax or similar breakers that have been used in Xantrex 
equipment.  My interest is for retrofits where a C-40 is being replaced with an 
MX-60, where arrays are being expanded using the same wiring to handle increased 
power at hgher voltage from the array.  I have assumed that the Xantrex 
breakers would have to be upgraded.
    Another question about 72 volt nominal arrays.  What happens if the Voc 
of the array rises slightly above the limit of the MX-60.  I have one array 
that, with the -10F daytime temperatures we have been having here, has gone over 
140 Voc.  Is there a sarety margin, and should I be at all concerned.

Thanks,
 
Jim Grundy
NABCEP Certified Solar PV Installer™
 
Elemental Energy
1750 Clark Rd
E. Montpelier, VT   05651
(802)-476-3441 P
(802)-476-5680 F
(802)-272-8933 C
EEnergy33 at aol.com

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