PV Solar Panels - more info
The Green Electrician is an installer of Solar PV (photovoltaic) Systems
(stand alone & grid connected) and is a REAL Assurance Scheme Member
FACT: If every roof in the UK were covered in Solar Panels, we could exceed the whole nation’s energy demand.
PV produces electricity as a result of the interaction of the sun with the semi-conductor materials in the PV cells. The equipment required for the process has no moving parts and as a result requires minimal maintenance. In addition the electricity is produced without emission or noise. It works during daylight hours – more electricity is produced when the sunshine is more intense and when it is striking the PV modules directly. However, the cells do not need to be in direct sunlight to work, so even on overcast days a PV cell will be generating some electricity.
- A PV cell consists of two or more thin layers of semi conducting material, most commonly silicon. When the cell is exposed to light, electrical charges are generated and this can be conducted away by metal contacts as direct current (DC). The electrical output from a single cell is small, therefore multiple cells are connected together to provide a more useful output. Cells connected in this way are encapsulated (usually behind glass) to form a weatherproof module or panel.
- The amount of solar electricity produced will depend upon the type of solar panel technology used, the size of available roof space, pitch of the roof, orientation, shading and budget. A typical domestic system of 1.5 kW in the UK would produce around a third of the annual demand of an average family household (taking the average demand to be around 3300 kWh per annum). However, calculating the system size depends on many factors, for example whether the system is grid connected, energy demand of the household etc.
- The average lifetime of a PV module can be in excess of 20 years; crystalline silicon modules in particular have a very long life span.
Stand alone or grid connected?
Each system has its own advantages. Stand alone systems are particularly useful for remote locations, whether this is a shed at the bottom of the garden or an isolated dwelling. You are independent from the National Grid and can store the electricity for when it is needed in a battery bank. Most PV systems in Europe are connected to the National Grid. With this type of system it is possible to export surplus electricity to the Grid. Prices paid for the electricity varies from 5-11p/kWh plus another 4p/kWh for Renewable Obligation Entitlement.
- You may need to apply for full planning permission to install Solar PV particularly if your property is in a conservation area, Area of Outstanding Natural Beauty or is a listed building. We recommend checking with your local council to see what their stance is on Solar PV panels.
Why install a PV system?
There are many reasons to install a PV system:
- It is the most practical and economically viable option for producing carbon-free electricity in urban areas
- Can easily integrated into the fabric of a building
- Electricity can be supplied at the point of use
- The system will run silently
- Requires minimal maintenance or running costs
- PV systems are modular, and can be added to at any time
- Cuts your fuel bills and gives you the option of selling surplus electricity
- Reduces dependence on fossil fuels
- Produces no carbon emissions or pollution
- Can increase the value of your property by 10-15%
If you would like any further information or advice then do not hesitate to contact us.
