ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Extension cords
by LongRunner. 05/25/18 12:19 PM
Fire source!
by LongRunner. 05/25/18 01:49 AM
Alternative income sources
by gfretwell. 05/24/18 10:07 PM
Furnace igniter leaking noise to stereo
by geoff in UK. 05/23/18 01:18 PM
Opinions Please
by Keith_Mc. 05/23/18 09:22 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
2 registered members (ampherder, geoff in UK), 29 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Roof Top Inverters #212084
12/10/13 12:57 AM
12/10/13 12:57 AM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 725
Tucson, AZ USA
Are roof top inverters common? Here in Tucson we have a "solar readiness ordinance" which requires, among other things, a raceway from the panel to the roof top during construction of new SFRs. Since 690.31 requires the DC output to be run in metallic conduit and kept at least 10" below the roof deck, which can be a tough in some of the multi-story sfrs we are doing with interior panels, we would like to use ENT. This would mean the inverter would have to be located on the roof. The other option is to run from the roof to a location outside the building with EMT, then back inside to the panel via ENT. We did this on the last one but it was a royal PITA. Of course no conduit may show on the building.

Tools for Electricians:
Re: Roof Top Inverters [Re: BigB] #212087
12/10/13 10:30 AM
12/10/13 10:30 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,967
Brick, NJ USA
The only thing I have seen to date is micro-inverters.

We (NJ) do not have a solar prep mandate yet, and the majority of solar is installed on existing SFDs.

Yes, some of the conduit installs are not IMHO attractive, but...code compliant. Some are downright ugly, but again MHO.



John
Re: Roof Top Inverters [Re: BigB] #212088
12/10/13 12:39 PM
12/10/13 12:39 PM
S
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
Like John said, micro-inverters are on the roof. Then you can run any chapter 3 wiring method to the roof. But that all depends on your solar prep rules.

Are you still on the 2005 NEC there in Tucson?

Re: Roof Top Inverters [Re: shortcircuit] #212092
12/10/13 11:15 PM
12/10/13 11:15 PM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 725
Tucson, AZ USA
Originally Posted by shortcircuit
Like John said, micro-inverters are on the roof. Then you can run any chapter 3 wiring method to the roof. But that all depends on your solar prep rules.

Are you still on the 2005 NEC there in Tucson?


No, we adopted both the 08 and 11 in one swoop Jan 1st. Had 2 days of classes.

Re: Roof Top Inverters [Re: BigB] #212093
12/10/13 11:43 PM
12/10/13 11:43 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,967
Brick, NJ USA
Thinking on this, not knowing the design of a 'future' PV install is tough.

Are there any 'specs' within the solar prep ord.?
Does the Architect of the SFD have anything within the plans?

Are micro inverters common in your area?



John
Re: Roof Top Inverters [Re: BigB] #212179
12/18/13 01:06 AM
12/18/13 01:06 AM
H
harold endean  Offline
Member
Joined: Feb 2002
Posts: 2,233
Boonton, NJ
Has anybody seen anything about higher voltage PV systems? I heard of a new style which runs voltages around 1000 volts. Only on the roof though, it gets stepped down to (I assume) 480/277 volts on the ground.

I have seen a couple of 480 volt systems, but I don't believe the roof voltage was 1K. I don't remember what It was, I think it was 600 volt.

Re: Roof Top Inverters [Re: HotLine1] #212187
12/18/13 11:43 AM
12/18/13 11:43 AM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 725
Tucson, AZ USA
Originally Posted by HotLine1
Thinking on this, not knowing the design of a 'future' PV install is tough.

Are there any 'specs' within the solar prep ord.?
Does the Architect of the SFD have anything within the plans?

Are micro inverters common in your area?



The architect is required to show on the drawings where the solar panels would be placed. If there is no possible place for the solar panels, then nothing needs to be done. If there is space for the solar panels, we are required to provide a raceway from that location to the service panel location. I don't really know how popular micro inverters are here but I know they are not unheard of.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
JoeKP
JoeKP
Berkley, MA
Posts: 144
Joined: March 2008
Show All Member Profiles 
Top Posters(30 Days)
twh 12
Popular Topics(Views)
246,909 Are you busy
184,276 Re: Forum
173,508 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.032s Queries: 15 (0.005s) Memory: 0.9851 MB (Peak: 1.1363 MB) Zlib enabled. Server Time: 2018-05-25 18:30:05 UTC