Solar PV Idiots Guide/FAQ’s
What is photovoltaics (solar electricity), or 'PV'?
The word ‘photo-voltaic’ itself helps to explain how photovoltaic (PV) or solar electric technologies work. It
translates as light-electricity which is what photovoltaic materials and devices do; they convert light energy
to electricity
Is Planning Permission Required
Under the permitted development rights for renewable technologies, most domestic properties in
England and Scotland do not require planning permission for the installation of solar PV panels.
However, properties in Conservation Areas, listed buildings and Areas of Outstanding Natural Beauty or
World Heritage Areas must consult local Planning Departments, non- residential buildings still require
planning consent.
How does the system work?
Daylight hits the photovoltaic cells and is converted to clean electricity. The inverter converts the electricity
from direct to alternating current, for use in the home.
When the solar energy system is producing more power than is needed it is exported to the grid. At night,
power is imported from the grid in the normal way.
Do the PV panels need direct sunlight to work?
No, Solar PV work even on overcast and winter days. They do however, produce more power when the
sun is strongest so shading must be avoided. Solar PV can be installed on East or West facing roofs but
it will not make as much power as if it were south facing.
What happens if there is a power cut?
Solar photovoltaic systems are mostly grid connected. If there is a power cut your system is automatically
switched off. This is a safety measure designed to stop electricity leaking on to the national grid and to
protect individuals who may be working to restore the power supply.
What maintenance and cleaning do the systems need?
Solar photovoltaic systems are silent in operation, have no moving parts and require no maintenance.
Most of the time the rain will keep the modules clean. However, a substantial build-up of dirt can affect
system performance. The modules can be cleaned with either a hose or, if possible, soapy water and a
non-abrasive brush.
What is the MCS
The Microgeneration Certification Scheme (MCS) (http://www.microgenerationcertification.org/) is a
government backed scheme that gives homeowners peace of mind that only certified solar PV installers
and products are used on your installation. Only MCS accredited installers can issue you with the
certification to enable you to benefit from the Feed in Tariff
What is the Feed in Tariff
If you install an electricity-generating technology from a renewable or low-carbon source such as solar PV
or wind turbine, the government's Feed-In Tariff scheme (FIT) could mean you get money from your energy
supplier.
You can be paid for the electricity you generate, even if you use it yourself, and for any surplus electricity
you export to the grid. And of course you'll also save money on your electricity bill, because you'll be using
your own electricity.
Feed in Tariff explained