Module Grounding [RE-wrenches]

[matthew tritt]

Jeff,

The most likely reason for corroded connectors is dissimilar metals in
contact with each other, coupled with high ambient moisture levels and,
possibly, low levels of electrical current. If the installer erroneously
grounded the array to the AC ground buss, guess where that current can come
from. There is "lots of corrosion" around those connections precisely
because the anodization has been removed from the aluminum in the hole that
the bolt is attached to, providing a great short term contact, and long term
failure point. The anodization is there for a reason. Every place you remove
it (like with a star washer) is a place where degradation will occur.

Matt
----- Original Message -----
From: "Jeff Yago" <jryago at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Wednesday, October 30, 2002 6:53 AM
Subject: RE: Module Grounding [RE-wrenches]


> I am also always thinking it does not make sense to add the extra ground
> wire system, when I visit another already installed array.  It seems every
> system I inspect that is over three years old had "rusted" connectors
where
> the ground wire is installed.  I know the bolts should be stainless steel,
> yet there is always lots of corrosion around these ground points.  I think
> many wire connectors, wire crimps, and washers being used are cadmium or
> copper plated steel which quickly beaks down.
>
> Has there ever been any real studies that have shown a anodized aluminum
> module frame bolted to an aluminum mounting rack with a stainless steel
bolt
> provides no electrical path even if there is no "cutting" washer?   Its
hard
> for me to believe that connection is any worse than the many corroded
ground
> wire connections I have observed.
>
> Jeff Yago
>
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