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Grid-tie Systems
There are essentially two common modes of Solar PV electricity
generation: stand-alone and grid-tied. Each mode employs both a generation
component and a storage component. Stand-alone, as the term implies requires no
outside connection to the utility grid to provide service 24/7, and employs a
battery array as shown above. The electricity generated during the daytime is
stored in the battery bank and released in a continuous power stream during the
night time hours when there is no generation.
Grid-tied systems, however have no battery system and rely on the utility grid
to store their generated energy. Such systems leave the customer linked to the
utility grid so that power is not interrupted. This is preferable where
availability to the utility grid exists; many current users of electric company
power are tied already to the grid. The diagram at the right shows how a
grid-tied system operates; a grid-tied system uses what the industry calls “net
metering” to keep track of electricity used and generated.
PV Systems that use net metering can store their excess electricity in the grid
to be used during a time when they need excess power; more than they generate,
and receive a single billing at the end of each year. That billing usually
shows, for a properly designed system, a small net excess in generated power, or
a billing for power used from the grid.
 
 
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THE GLOBAL WARMING DEBATE IS OVER...ITS HERE
BUT ITS NOT WHAT YOU THINK!!
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