[RE-wrenches]

[Ken Schaal]

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Vince and all,
You may also want to check out www.polyphaser.com . Last year we used their
equipment and a plate type ground  for a system rebuild that had extremely
poor soil conductivity, and  two thoroughly fried SW's

Any other thoughts on PolyPhaser, other than cost.?

I also have a question for grounding an array located on a large flat rock
in the rain forest in Gabon. The rack will be pinned to the rock thru
concrete piers and rebar, maybe 1' deep max. The distance to the forest
,where soil depth may get to 2', is less than 100'.Current plan is a copper
sheet about 2'x8' buried as deep as reasonable. Any suggestions?  Thanks

PS-- this is a critical system as they're 12 km from the nearest jeep trail
and power is for a research station with office equipment that has to be
kept relatively dry.

Thanks in advance for any input,
Ken Schaal at CommonWealth Solar

----- Original Message ----- 
From: "Vince McClellan" <wrenches at solarenergydesign.com>
To: <RE-wrenches at topica.com>
Sent: Saturday, September 18, 2004 12:42 PM
Subject: [RE-wrenches]




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Hi Folks
Has anyone out there used a MOV surge protector from an outfit called
Lightning Protection Corporation. I am looking for a good surge
protector for a 12.6KW (STC) grid-tie using 84) Isofoton I-150s, seven
to a series string. About a max of 350 Voc in cold weather. I also need
a good surge protector for the 208 V output of 4) PVPowered PVP2800
inverters.
The part # that Lightning Protection Corp. suggested for the DC side is
Model LPC 11895-400 and on the AC side Model LPC 11765U-13.
 I have heard from several different people that the Delta Protectors
are little or no protection. Basically a jar of sand with two electrodes
in it. I wonder if anyone has done any independent test on different
surge suppressors for the renewable energy industry? I have also heard
that MOVs (metal oxide varistor) can have a short life span if they are
subjected to very many spikes. Any suggestions on a good surge protector
for PV use?
Here is Lightning Protection Corp. link if anyone wants to check it out:
www.lightningprotectioncor.com

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