| These inverters allow a photovoltaic array to be used in synchronised
connection with a grid supply. No battery store is required.
Power generated is first used by the house
loads etc. and any surplus exported (sold) to the grid. At night, or when power consumption
exceeds power generated, power is imported from the grid as normal.
How does it work?
In PV applications the
inverter will
automatically adjust the PV array loading to provide peak efficiency of
the solar panels by
means of maximum power point tracking (MPPT).
Inverters automatically shutdown in
the event of:
- High/Low grid AC-voltage
- High/Low grid frequency
- Grid Failure
- Inverter malfunction
Versions are available which can be
used with wind turbines. An additional wind turbine controller is still required.
Technicalities
Connection of a wind/PV
electrical system to the electricity grid must have local electricity company approval and
installation method and protection must meet their safety requirements
and appropriate standards.
There are costs associated with
connection and metering to/from the grid. Also, the rate paid for electricity generated is
presently considerably less than that charged for electricity consumed.
Thus, the best economics
are obtained if all the power generated can be consumed on site.
Wind & Sun have
considerable experience of grid connected PV having designed, installed
and commissioned
some of the first such systems to be installed in the UK and can help with satisfying electricity company
requirements.
A full installation service is
available.
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