How about Lightning Damage? [RE-wrenches]

[graham at solarexpert.com]

Jerry Caldwell wrote:
> Has anyone ever seen a module pigtail of USE-2 with
> the insulation totally cooked off the wire for several
> inches?  Is this likely to be lightning damage?
> 
> Also, what brands & models of lightning arrestors
> would wrenches recommend, or not recommend for use
> with Sunny Boy or other high voltage systems?
> 
> Jerry Caldwell


Jerry,

Arcing from loose connection, or possibly moisture intrusion most likely 
caused the burnt USE pigtail.

We use Delta AC surge arrestors for installations in Los Angeles.  We 
install the cans on the AC disconnect. Here there is a much greater 
likelihood of an AC line surge from the grid than a lightning strike.  I 
think most inverter manufacturers specify their protection preferences 
in the installation manual.

Graham

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