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Small grid-tie inverters? - Page 4

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Posted by BobG on June 20, 2008, 5:13 pm
 

==========================
==========================
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Wait a minute... line shuts off, that condition is abundantly obvious
1/60th of a second after it occurs.... open circuit... no current
flowing. The other condition, trying to run the whole neighborhood is
also easy to detect... not enough juice for the next cycle. So I see
no problem with these two situations. Wouldnt want to PO any power
company employees. How bout some brainstorming on synch and connect
algos instead of 'naaaah... you cant do that... even if you're smart
enough, theres someone up the chain that will say no if you ask...'?
That's the Intellectual Property that the inverter mfgrs seem to be
keeping close to their vests.

Posted by Martin Riddle on June 21, 2008, 12:50 am
 


=========================================================
Wait a minute... line shuts off, that condition is abundantly obvious
1/60th of a second after it occurs.... open circuit... no current
flowing. The other condition, trying to run the whole neighborhood is
also easy to detect... not enough juice for the next cycle. So I see
no problem with these two situations. Wouldnt want to PO any power
company employees. How bout some brainstorming on synch and connect
algos instead of 'naaaah... you cant do that... even if you're smart
enough, theres someone up the chain that will say no if you ask...'?
That's the Intellectual Property that the inverter mfgrs seem to be
keeping close to their vests.

Syncing easy, PLL.
For line dropouts, you can warble the frequency, as the phase of the two systems
change you'll see the power increase.
If its an island effect, you will not see the power increase(since the other
inverter is syncing to yours) and you shutdown.


Cheers



Posted by Eeyore on June 20, 2008, 7:22 pm
 

z wrote:>


That would be a a non-compliant grid-tie inverter.

Gragam



Posted by We Can Do It on June 20, 2008, 8:02 pm
 

And at least in GA USA you are required to register any NUG
( non utility generators) with the power company or you are
breaking the law. You want to do this here since the power
company will change out your metering and make it bi
directional ( at your expense ) and provide and register a
disconnect they can controll ( at your expense) and have you
sign liability waivers. The up side is that in the event you
actually put power back on the grid they pay your about double
what they charge you to take it off the grid.

peace
dawg


Posted by BobG on June 20, 2008, 8:42 pm
 
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I use 30kwhr a day. If I pump 2kwhr back in while the sun is shining,
how's the power company going to know?

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