Blocking diodes with PVLs [RE-wrenches]

[Joel Davidson]

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Jim,
Some people think that string circuit blocking diodes are recommended or
required because they see the drawing in NEC 690. I have done thousands of
330-600 volt string circuits and have never put in a string circuit blocking
diode.
Joel Davidson
----- Original Message ----- 
From: "Jim Grundy" <eenergy33 at aol.com>
To: <RE-wrenches at topica.com>
Sent: Monday, September 13, 2004 7:22 PM
Subject: Blocking diodes with PVLs [RE-wrenches]




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Esteemed wrenches,

     Another Diode question that I have posed to Uni-Solar but without
getting an answer.   The PVL manual says "Utility line tie systems 48 volts
and
above:   Blocking diodes are recommended for every series string of
modules....

     Does anyone have experience with this question.   Blocking diodes for
high voltage strings in a grid tie application?   They recommend 8 amp, but
what
type and voltage rating?   Thanks in advance for any insight.

Jim Grundy
NABCEP Certified Solar PV Installer TM
Vermont Solar Plumbing Specialist license # PS-279
Vermont Solar and Wind Partner
Elemental Energy
1750 Clark Rd
East Montpelier, VT 05651
(802) 476-3441 (p)
(802) 476-5680 (f)
(802) 272-8933 (c)


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