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Grid tied solar question

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Posted by merlin-7 on October 9, 2007, 10:16 pm
 
 If you have a grid-tied solar system, does your output voltage need to be
higher than the grids in order to feed the grid?
 Thanks



Posted by Anthony Matonak on October 10, 2007, 12:30 am
 
merlin-7 wrote:

The voltage of the inverter has to be higher than the grid but
not by much. Since the voltage of the grid is AC and constantly
changing the inverter has to produce exactly the right voltage
and direction for that particular moment in time.

None of this is of any importance to a regular person unless
you are designing your own grid-tied inverters. All a normal
person needs to know is that it passes the UL-1741 standard
(in the United States).

Anthony

Posted by merlin-7 on October 10, 2007, 1:13 am
  So what would happen if everyone had had a grid-tied solar system
connected?
How could many grid-tied systems be able to function at the same time, with
all of them trying to be higher in voltage than the main grid?



Posted by Charles Quinn on October 10, 2007, 1:38 am
 

The same way all those generators do by adjusting the phase of the sine
wave.

http://en.wikipedia.org/wiki/Grid_tie_inverter


--

Charles
The significant problems we face cannot be solved
at the same level of thinking we were at when we
created them.  Albert Einstein


Posted by Eeyore on October 10, 2007, 3:14 am
 

merlin-7 wrote:


Plenty.


Are you concerned that the voltage would rise ? It would actually but
*minutely*. Same as it does now when the loading is light.

The determining factor is Ohm's Law. V= I.R.

Graham


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