Photovoltaic systems use cells
to convert solar radiation into electricity. The
PV cell consists of one or two layers of a semi
conducting material, usually silicon. When light
shines on the cell it creates an electric field
across the layers, causing electricity to flow.
The greater the intensity of the light, the greater
the flow of electricity.
Photovoltaic
(PV) panels generate electricity, which can be used
in your home. During
installation of a PV system, there is little disruption
to your home - all the components are on your roof
or in your loft, apart from a meter and switch which
can be installed by your main fuse box.
Your electricity bills will be
lower because often you will be using electricity
from the PV system instead of taking electricity
from the mains. A typical household consumes 3000-4000
kWh on average per annum. A 2 kWp system would provide
almost 50% of your electricity needs i.e. 1500 kWh.
This can vary considerable dependent on your electricity
consumption and how energy efficient your property
and electrical appliances are. It is possible for
a 2 kWp PV system to supply all your electricity
needs if you implement all possible energy saving
measures and of course with a larger system 3-4kWp
you could easily meet your needs, but you would
obviously need more unshaded area and a larger budget.
How much will a grid connected
system cost?
The PV array consists
of a number of individual photovoltaic modules connected
together to give the required power with a suitable
current and voltage output. Typical modules have a
rated power output of around 75 - 120 Watts peak (Wp)
each. A typical domestic system of 1.5 - 2 kWp may
therefore comprise some 12 - 24 modules covering an
area of between 12 - 40 m2, depending on the technology
used and the orientation of the array with respect
to the sun.
Most PV modules deliver direct current (DC) electricity
at 12 volts (V), whereas most common household appliances
in the UK run off alternating current (AC) at 230
V. An inverter is used to convert the low voltage
DC to higher voltage AC. Numerous types of inverter
are available, but not all are suitable for use when
feeding power back into the UK mains supply.
We
also offer a range of DIY kits for remote buildings
such as stables barns and out-houses which can be
installed easily. These systems are generally mounted
on an existing roof or placed in an un-shaded area
in an array of solar modules and come with full
installation details.Solar
Power Station
