RLB_UK_Riders_Digest_2013

elated to available roof area with a suitable aspect and pitch.
Even for the most efficient monocrystalline panels, 8m2 of
PVs are required to generate 1kWp – an output that will
typically contribute about a fifth of annual household electricity
consumption.
How does it work?
Photovoltaic materials, commonly known as solar cells,
generate direct current electrical energy when exposed
to light. Solar cells are constructed from certain semiconducting
materials that absorb solar radiation; electrons
are displaced within the material, thus starting a flow of
current through an external connected circuit, converting
solar energy into electrical power.
Cells are grouped together to form “PV modules” that may
in turn be arranged in “solar arrays” which are referred to as
solar panels.
The best way to utilise PV cells is to use them as a direct
replacement for an element of a building. For example PV
cells could be used as roofing or shading elements on south
facing roofs, as façade panels on the south façade or as an
architectural feature integrated within glazing.
A source of renewable energy which can be grid connected
Feed In Tariffs replaced government grants on 1st April 2010
index linked and guaranteed for 25 years, greatly improving
the financial return. Note: January 2012 the Government is
reviewing the tariff and threatening to halve it.
Feed In Tariffs are tax free to private individuals
Power is exempt from the Climate Change Levy
The system produces no noise or harmful emissions
No moving parts, leaving minimal operational or maintenance
costs
Does not require direct sunlight, but care must taken to avoid
overshadowing
Limitations
Initial costs are high, but may be partly offset if integrated
with building fabric
Planning issues could be a problem
Businesses must pay tax on Feed In Tariffs
May have implications for load capacity of roof or building
structure
May have implications for availability of plant space on roof
PV panels may require regular cleaning
© Rider Levett Bucknall UK 2013 105