The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by ghost307
Today at 04:10 PM
International Wire Colour Codes
by Tjia1981
Today at 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 7
ghost307 6
renosteinke 6
Potseal 4
Who's Online
1 registered (HotLine1), 162 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#194145 - 05/12/10 08:49 PM Solar Installation 10KW
DGSparky Offline
New Member

Registered: 05/12/10
Posts: 4
Loc: GTA Ontario, Canada
Currently I am looking at a 10KW solar install. The plan is to install 2 string inverters (5KW ea.) at the house 350ft away from the panels. This would involve 4 DC circuits at about 355V each. Full load current would be about 8 amps. I plan on using 8 runs of 1/0 RW90 cable (4runs x 2 wires/cct) I figure this would be about a 3.5% volt drop. Additionally this would all go in one 4 inch PVC conduit underground. I have never installed DC circuits of this high voltage before, does anyone have any thoughts or considerations on this setup and on working with high voltage DC circuits?

2014 / 2011 NEC & Related Books and Study Guides
#194155 - 05/13/10 07:49 AM Re: Solar Installation 10KW [Re: DGSparky]
ghost307 Offline

Registered: 05/09/05
Posts: 882
Loc: Chicago Illinois USA
Make very certain that you understand exactly how to wire equipment when using DC. For example; disconnects and safety switches get connected very differently for DC than for AC.

And never forget that there will be DC coming from the panels from the instant that they are taken out of the box. The only way to shut the panels off is to hide them from the sun. Just assume that things are always live and you should be fine.


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals