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Country
Electrics
Guide to Solar Panels
What
are Solar
(photovoltaic) Panels?
They convert sunlight directly into electricity that can be used to run appliances
and lights. Solar panels generate energy even when it is overcast and cloudy
as they absorb scattered light.
How are panels fitted?
Panels can be mounted on a roof or on a frame on the ground. Ideally the roof
will be south facing, or near to at an angle of 30 degrees with the horizontal
for optimum performance. The panels produce DC electricity, so a small inverter
will be fitted inside the house, to change the DC into AC (used in all normal
homes and the Grid). Installation is clean, with minimal disruption and no
extra space needed indoors.
How many are needed?
Any number of panels can be connected based on available space, to provide
as much electricity output as required. A basic 2kWp solar panel installation
will generate around 1500 kWH per year.
Will it supply all
my electricity?
The average household consumption is 3300 kwh per year. The 2kWp system would
supply nearly 50% of annual consumption. A 4 kWp system could provide all electricity
needs depending on consumption for the average household.
How do they connect
to the Grid?
PV systems can be connected to the Grid or used as stand-alone systems. If
they are connected to the local electricity supplier network, any excess solar
electricity (produced during the day) can be sold back to the utility. During
the hours of darkness, electricity is taken back from the Grid, as required.
Stand Alone Systems
In this case, the electricity produced is stored in a battery bank.
Grid
Support Systems
This mixes battery and the Grid, with any excess solar electricity produced
after the battery is fully charged, is then sold back to the Grid.
Maintenance
and installation
As there are no moving parts, there is no noise or need for maintenance other
than an occasional clean as required. Panels come with a warranty of over 20
years. During installation of roof systems, scaffolding is required. Installations
usually take 3-4 days.
Prices
These
vary depending on the size of individual installations and the
complexity of mounting.
Planning
Some
authorities require planning permission before you can install
a PV system, especially in conservation areas or on listed buildings.
Although current legislation, if passed, will remove any planning
requirements.
Grants
The
Government has relaunched the grant scheme for householders fitting
solar photovoltaic systems (June 2007), offering £2,500
or 50% of the relevant eligible costs, whichever is the lower.
For
more information
click here >
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