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
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
Son of Sparky
by gfretwell
10/16/16 07:53 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
Is this a fix or just a bandaid?
by gfretwell
10/10/16 06:49 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
renosteinke 6
ghost307 5
HotLine1 5
Potseal 4
Who's Online
1 registered (hyetal), 285 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#211026 - 09/04/13 11:19 PM Multiple Grid Tie Inverters
AllClear Offline

Registered: 08/22/05
Posts: 39
Loc: Belmond Iowa US
I've been kicking around PV for my farm.
But after watching YouTube videos of guys with Multiple eBay Chinese special grid tie inverters, I couldn't help wondering if you had two of them going at the same time when the grid went down if they wouldn't keep each other going and possibly make a fatality out of a lineman?? They are supposed to shut off output power when they sense grid loss.
It Seems like something that should be addressed somehow.
It's Not The Fall That Kills You...
It's That Sudden Stop At The End

Green Building & Alternative Energy Related:

Green Building, Projects & Technology, Alternative & Renewable Energy and Efficiency Books and Reference Materials
Green Bldg, Projects & Technology, Alternative & Renewable Energy Books & References

#211029 - 09/05/13 01:03 AM Re: Multiple Grid Tie Inverters [Re: AllClear]
gfretwell Offline


Registered: 07/20/04
Posts: 9023
Loc: Estero,Fl,usa
I think they are smart enough to see the grid drop. Scott may be better to guess at this but I think they actually trigger on the rising grid voltage above zero and kick in a few hundred microseconds after that. With no grid, none of them would trigger.

The open question might be if a small battery inverter would trigger them but you would still have to isolate that from the grid with a transfer switch.
Greg Fretwell

#211030 - 09/05/13 04:55 AM Re: Multiple Grid Tie Inverters [Re: AllClear]
shortcircuit Offline

Registered: 06/27/04
Posts: 608
Loc: massachusetts
UL-1741 listed Grid Tied Inverters have to shut down upon loss of power from the grid. I don't know what type of black market junk is selling on ebay...but any legitimate company installing PV systems with the proper inspections won't be buying equipment on ebay...


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