DC lightning protection (was DC-GFP/2 protection) [RE-wrenches]

Rob Wills RWills at AdvancedEnergy.com
Mon Sep 2 15:37:47 PDT 2002


Hi Alan - say you have a 240V nom PV string voltage - 20 modules in series.
Your rack is two modules high and 10 long.  The easy way to wire it is along
the top and back along the bottom - making a wonderful loop to inductively
couple to lightning.  Better is to cross connect so that you series bottom
#10, top #9, bottom #8, top #7... That minimizes the loop area by putting
twists in the string.  It's probably OK to cross over every 2 or 3 to
simplify - just minimize the loop area.

Regards

Rob Wils

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com]
Sent: Monday, August 26, 2002 1:22 PM
To: RE-wrenches at topica.com
Subject: Re: DC lightning protection (was DC-GFP/2 protection)
[RE-wrenches]


Rob,
Please elaborate on what you mean by these two directives:
>In large systems, always minimize your source circuit loop area by panel
layout and crossing over the
string wiring between runs of modules.
Thanks.
Allan at Positive Energy


----- Original Message -----
From: "Rob Wills" <RWills at AdvancedEnergy.com>


> Something else to understand is that it does not take a direct strike to
> take out an inverter.  The PV system is sandwiched between the plates of a
> large capacitor (ground and the lightning bolt) and/or can pick up current
> by magnetic induction in PV source circuits.  In large systems, always
> minimize your source circuit loop area by panel layout and crossing over
the
> string wiring between runs of modules.
>
>

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