The PV array is installed in the best location to maximise the power output, for
example in a residential installation on the roof. The PV modules are connected in
series to generate a direct current (DC).
This direct current is converted to alternating current (AC) at grid rating by the
inverter. Each kWp installed in the UK will generate, on average, 800 kWh. This will
vary depending on orientation and location.
This AC generated by your PV system is connected into the main distribution box for
the building. Here it is used the same as the electricity that would have been drawn
from the grid.
In times when you are producing more than you are using, any excess is fed back to
the grid while in times of excess demand, this is topped up by drawing from the grid.
The meter will thus show the net electricity exported or imported to or from the
national grid by the property.