electric meter conunting back injecting electricity ?

 Is it possible to inject current back to the net from solar pannels when
active, so that the electric meter counts back?

    Not intending to sell electricity to the network carrier, just return
the extra power produced during daylight.

If possible .. What would it be needed?

Here in sunny Spain we use 220V AC ~ 50Hz

Any ideas?

Thanks in advance.

  On Wed, 03 Oct 2007 18:08:08 +0100, CENTRINO wrote:


It's possible, but does your electric power provider allow it?
If you talk to them, they can give you the info you need for your region.
Jeffrey

 
If I understand right, what you're looking for is a very commonly used
scheme, and not only allowed, but encouraged in countries like Spain.
You need to check with your local utility, of course.

The heart of such an interconnection is a device called a "Grid-Tied
Inverter", which you can Google to learn about.  Basically, you
connect your solar panels to one side of the box, and connect the
other side to the electric net (grid), and the box takes care of
things automatically, driving your meter backward if you produce more
than you consume.  I'm simplifying, but that's the general idea.

A grid-tied system takes some up-front money to build, and is usually
at least 1000 watts of solar panels, a common system being several
times that.  As for the inverter, well, you can look up prices for
that.  In Spain's favorable economic environment, it might even be
worth getting a loan to construct such a system.

 

Well, moving your meter backwards is exactly that, selling electricity to
the power company.  For every rotation backwards, you are effectively
receiving a credit to your account for the electricity you 'injected' into
the grid.

But I'm not sure of the type of meter used in Spain, it may not be capable
of moving backwards.


What you're looking for is a 'grid-tie inverter'.  It will take the DC power
from a solar installation and 'inject' it back into the electric grid.

Here in the US, you must have equipment that meets certain standards.
Otherwise there are risks in 'injecting' electricity into the grid when the
power company has disconnected your neighborhood for some reason.

In some local areas in the US it is illegal to do this, while in others it
is being encouraged.  Best to check with your local power company and ask
them about 'grid-tie inverter' use with solar power.

Good Luck

daestrom