Long distance DC feeders [RE-wrenches]

[John Berdner]

-----------------------------------------------------------
Give Your Team Access to Their PCs from Anywhere. Increase 
productivity with a secure remote-access solution from 
GoToMyPC Pro. Stay in touch with your office. FREE TRIAL:
http://click.topica.com/caaciqXbz8Qcsbz9JC9a/ExpertCity
-----------------------------------------------------------

Marco:
 
By home runs I meant a separate dc positive and dc negative for each
inverter.
In contrast you could have a dc combiner with multiple sub-array's in
parallel then a single pair of bigger wires running the long distance
then split out to feed multiple inverters.  
 
A separate ground rod at the array can be used >> but << you probably
have to run a separate ground wire back to the house UFER to bond the
two grounding systems together.  
Some have argued that this is not required because at 200' it is a
"seperately derived system".
I don't read the Code that way any more (after repeated spirited
discussions with J. Wiles)
We have also seen some some GFDI issues in this set up.
My guess is circulating ground currents caused by the array frames
being referenced to one rod and the array negative to a different rod at
a different potential.
 
Best Regards,
 
John Berdner
 
>>>>

John,

'Sorry to be dense here. "Home runs" for each array? For example, I'm
going to be doing a SB array that's about 200' from the inverter. The
array
is going to be mounted on a barn roof. The barn will have its own UFER
ground. Twas my plan to ground the array frames to the barn UFER ground
and
run the + and - (adequately sized, of course) to the inverter. The
inverter
will be grounded to the UFER ground at the house.

Am I missing somethin'?

aloha,
marco

- Have to pull home runs for each array.
(Since we ground our arrays here in the USofA the GFDI circuits see
the other GFDI as a ground fault)
(In the ROW, with floating arrays you can parallel the arrays and use
Sunny Team for higher efficiency and N+1 redendancy)



--
[Non-text portions of this message have been removed]

-----------------------------------------------------------
Apply now for a No-Annual-Fee Discover® Platinum Card 
0% Intro APR*, No Annual Fee, Up to 2% Cashback Bonus® 
award* Start Saving Today – APPLY NOW! It's fast, easy and 
secure. 
http://click.topica.com/caaciqQbz8Qcsbz9JC9f/Discover Card
-----------------------------------------------------------

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & etiquette: www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------