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Low impedance grounding is the most important. We have a ground
impedance tester, and anything less is just guess work.<br>
Uffer grounds (tied to exposed rebar in the footing) are usually
lower impedance than rods, also a steel cased well can be an
excellent ground, since it is essentially a metal conductor going
down to the water table.<br>
You might also consider lightning diffusers on high points along the
peak of the roof a couple of feet higher than the array.<br>
Consider working with a lightning protection specialist.<br>
For arrestors/ suppressors stay away from the Deltas (not very
effective from my experience) but take a look at Midnite Solar's new
line of lightning protection equipment.<br>
<br>
Ray Walters<br>
Solarray, Inc.<br>
<br>
On 9/9/2011 12:32 PM, James Rudolph wrote:
<blockquote
cite="mid:CAA4FQ5odSy5fFjS4uC=GrVsAKSv5PD6UAri2ODxM7w4hbBns4Q@mail.gmail.com"
type="cite"><br>
Dear Wrenches,<br>
<br>
Does anybody have any best practices for designing large PV arrays
on metal building in lightning prone areas? Lightning arrestors on
the DC side and Surge suppressors on the AC load side? Any input
or resources would be greatly appreciated.<br>
<br>
Sunny Regards,<br>
<br>
James Rudolph<br>
NABCEP Certified Installer<br>
Master Electrician<br>
SF Energy<br>
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