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Multiple Grid Tie Inverters #211026
09/05/13 02:19 AM
09/05/13 02:19 AM
AllClear  Offline OP
Joined: Aug 2005
Posts: 44
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.

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Re: Multiple Grid Tie Inverters [Re: AllClear] #211029
09/05/13 04:03 AM
09/05/13 04:03 AM
gfretwell  Offline

Joined: Jul 2004
Posts: 9,185
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
Re: Multiple Grid Tie Inverters [Re: AllClear] #211030
09/05/13 07:55 AM
09/05/13 07:55 AM
shortcircuit  Offline
Joined: Jun 2004
Posts: 608
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...


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