Photovoltaics or PV panels
These use the energy from the sun to create electricity, and they use daylight as direct sunlight is not required to operate
Solar Electricity systems comprise of individual PV cells that are connected to form a module. .Each cell consists of one or two layers of a semi-conducting material, usually silicon. When light shines on these cells an electric field is created across the layers causing electricity to flow. The greater the light intensity the greater the electricity flow.
The amount of electricity generated depends on the amount of cells installed. A south facing roof which is not shaded gives the best results.
How the System Works:
- Daylight hits the PV panels and is converted to electricity.
- An inverter converts the electricity generated to make it suitable for use in the home.
- The system is then connected to the mains.
- The system generates electricity all day.
- Electricity can be used for household consumption. Unused electricity ,then flows out to the grid.
- It is possible to sell unused electricity back to your electricity supplier.
PV panels come in a variety of shapes and colours ranging from grey solar tiles that look like roof tiles, to panels and transparent cells that can be used on conservatories.
- PV panels can be used on buildings that have a roof or wall that faces south.
Chimneys, roof lights, trees or buildings can all shade your panels and
need to be taken into consideration when deciding where to position
the system, as shading makes a huge difference to the performance
of the system. - A typical installation would require at least 7-15m2 of roof area.
- The PV panels are a significant weight so the roof must be strong if they are to be placed on top of existing tiles.
- Some local authorities require planning permission, especially in conservation areas. Your local authority will have details.
- About 25% of an average household’s yearly requirements can be produced.
- They reduce your carbon footprint
- They require minimum maintenance.
- They have no moving parts and so are silent.
- The system could add value to your property.
Once the system is installed there’s generally very little maintenance required.
