Operator`s manual

Installation and Operator’s Manual Page 10 of 62
(PVI-2000-OUTD-UK
Rev: 1.0)
2 SYSTEM DESCRIPTION
AURORA is an inverter able to feed energy to the electrical power distribution
grid.
Photovoltaic panels transform the solar radiation into electrical energy in the form
of direct (Dc) current (through a photovoltaic field, also known as PV generator).
In order to utilize this energy and feed it back to the distribution grid, this energy
shall be turned into alternating (Ac) current. AURORA does this conversion, also
known as Dc to Ac inversion, in a very efficient way, without using rotating parts
but just static power electronic devices.
When used in parallel with the grid, the alternate current generated by the inverter
is directly fed to the domestic distribution circuit, which in turn is also connected
to the public power distribution grid.
The solar energy system can thus feed power to all the connected users, such as
lighting devices, household appliances, etc.
If the energy generated by the photovoltaic system is not enough, the energy
necessary to ensure the standard operation of the connected users is drawn from
the public power distribution grid. Any excess energy produced by the inverter is
exported to the grid.
According to national and local standards and regulations the produced energy can
be sold to the grid or credited to the user against future consumption.
2.1 Main Elements of a PV System: “STRINGS and ARRAYS”
The so-called “string” technology has been developed in order to reduce the
installation costs of a photovoltaic system as much as possible. These costs are
mainly related to the wiring operations on the Dc side of the inverter and the
consequent distribution on the Ac side.
A photovoltaic PANEL is composed of many photovoltaic cells assembled on the
same mount. A STRING is composed of a certain number of panels electrically
connected in series. An ARRAY is composed of one or more strings connected in
parallel.
Larger photovoltaic systems, can be composed of a certain number of arrays,
connected to one or more AURORA inverters. By maximizing the number of
panels in series per string, the cost and complexity of the system wiring can be
reduced.