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Page
20
of
76 MICRO-0.25/0.3-I-OUTD-US-208/240 BCG.00612_AB
Part
1 Introduction and Safety
1.3 SYSTEM INTEGRATION
This system is composed of a group of MICRO inverters that convert direct electric current from a
photovoltaic module into alternating electric current and feeds it into the electric grid.
Photovoltaic modules transform energy from the sun into direct current (DC) electrical energy. In
order to use DC energy, it is necessary to transform the type of current into alternating current or
“AC”. This conversion, known as DC to AC inversion, is made efficiently without using rotating parts
and only through static electronic components.
In order to allow inverter operation in safe thermal and electrical conditions, in the event of
adverse environmental conditions or unsuitable input voltage values, the unit automatically
reduces the value of the power fed into the grid. This way the solar energy system compensates for
the energy drawn from the utilities connected to the grid to which it is linked. The solar energy
system therefore powers all connected electrical devices, from lighting to household appliances, etc.
When the photovoltaic system is not supplying sufficient power, the power needed to ensure
normal operation of the connected electrical devices is drawn from the grid. If, on the other hand,
excess power is produced, this is fed directly into the grid, becoming available to other consumers.
1.3.1 C
HARACTERISTICS OF
MICRO I
NVERTERS
Unlike systems subdivided into strings controlled by one or several inverters, systems of this sort
are built for the incorporation of a MICRO inverter for each photovoltaic module
.
Each MICRO inverter works independently of the others, thus its own photovoltaic module supplies
the maximum power available to the grid. This setup enables direct control over the production of a
single photovoltaic module, consequently optimizing production as much as possible.
1.3.2 N
OTES ON
S
IZING OF THE
S
YSTEM
Decisions about how to structure a photovoltaic system depend on a number of factors and
considerations depending on the type of modules, the availability of space, possible future
expansion of the system, and the energy production goals over the long term, etc.
A configuration program that can help to correctly size the photovoltaic system is available on the
Power-One website at www.power-one.com .