literally means “light” and “electric.” Photovoltaic technologies are used to
generate solar electricity by using solar cells packaged in photovoltaic
The most important components of a PV cell are the two
layers of semiconductor material. Sunlight strikes a solar PV panel. Inside
that panel are one or more semi conductors that facilitate the creation of an
electric current from sunlight.
That electricity is sent through wiring to an inverter,
where the direct current (DC) is converted into alternating current (AC)
compatible with your home appliances and the utility grid.
From the inverter, the AC voltage passes through the
breaker panel, where it is sent one of two places – either into the home to
power electrical devices or to the utility meter..
The utility meter measures the amount of solar electricity
produced as it is sent to the National grid for use somewhere else. For homes
with solar power systems, this meter counts in both directions. That is, when
the solar panels are sending energy to the grid, the meter rolls backward, and
at night when the grid is providing power to the home, it rolls
How PV Solar Energy
works All PV
cells have two layers of semi-conductors, one positively charged and one
negatively charged. When light shines on the semi-conductor, the electric field
across the junction between these two layers causes electricity to flow. (The
greater the intensity of sun light the greater the flow of electricity). The
panels produce direct current (DC) which is converted to alternating current
(AC) by an inverter so it can be used by appliances in the home. These systems
can either be connected to the national electricity grid or off grid systems. Of
all the micro-renewable energy technologies available, photovoltaic is:
The most straight forward to install and is an easy
system to maintain
Has zero noise, Is pollution-free and
environment-friendly and Is eligible for government incentives, from savings
on energy bills and from energy sales
The Electrical Connection In order to use the energy generated by the PV system, it needs
to be connected to the mains electrical supply via an electrical panel which is
supplied by National Solar PV.
The panel contains
a number of items including:
The inverter(s) which convert from (DC) direct current to
grid synchronised AC(alternate current)
Safety fuses and isolator switches, for the input from the
PV panels, and output to the grid
Various meter’s for measuring the energy generated by the
system, the voltage and current coming from the PV system.
The electrical connection may be either to a single or three
phase supply, depending upon the type of electricity supply to your property.
With any PV array (installed PV solar panels) greater than 4kwp, you will also
need to obtain permission from your electricity supplier to make the grid
connection. National Solar PV can contact them on your behalf and make the required
arrangements.If you need further information on how solar panels work, be sure
to contact us or send us a message.