[RE-wrenches] !000 volt wire for trench-buried extended runs - what type?

Howard Arey scot.arey at solarcentex.com
Tue May 17 15:52:51 PDT 2016


Good day, wrenches.

 

I am installing four dual axis trackers totaling 52KW (13KW per) to four
individual Fronius Primo 12.5 Primo's.  We've done this setup before except
this time, we'll mount the inverter at the meter instead of carrying
inverting at the tracker and carrying 240 volt over a 300+ foot ground run
for the four combined trackers. And to the heart of this question, we'll run
under 1,000 volt rules for this commercial ranch setup. Goal is to user
higher voltages and minimize amps running through conductors.

 

So my project is:

 

4 each 13KW trackers

Each tracker is 3 strings of 14 modules and about 705Voc and 520 Vmp. This
combined 3-string output for each tracker will have Isc of 8.89 x 3 = apc 27
amps

We'll pull each set of tracker conductors (4 trackers, plus one more run for
a 5th tracker) so 10 +/- conductors. I've done the necessary conditions of
use derates.

 

The big question is what would you select as this 1,000 volt rated wire for
conduit covered installation? PV Wire will get mighty expensive and I don't
even know if I'll find in 4AWG.

 

I ran into this one time before and we just did multiple strings to keep in
the 600volt category but I don't want to do here because that means I double
the number of conductors (and go from 3200 to 6400 feet of wire.String math
and MPP ranges keep me at strings of 14.

 

I want to centrally mount the inverters instead of one at each tracker for
looks and reduce 240 wire sizing.

 

What type cable would you use?

 

Howard "Scot" Arey

Owner, Solar CenTex

254-300-1228

scot.arey at solarcentex.com

 

www.solarcentex.com <http://www.solarcentex.com> 

https://www.facebook.com/SolarCentex

http://www.solarreviews.com/installers/solar-centex-reviews/

 



 

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