Wolf Passive Homes

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Solar PV Panels

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Photovoltaic (PV) converts light into electricity.
Our PV Solar systems use natural daylight or solar radiation, to produce electricity.
Within the system will be an ‘inverter’, this converts the DC power into AC power which you can use in your home or sell back to your electricity supplier.
The government Feed in Tariff (FITs) means the installation will an income, as well as savings.
The scheme guarantees a minimum payment for all electricity generated by the system, as well as a separate payment for the electricity exported to grid. These payments are in addition to the bill savings made by using the electricity generated on-site.

Key Benefits

Generate your own - a typical 1kWp system could generate around 800kWh of electricity per year; 25% of an average home's requirements
Generate additional income - by registering your installation for FITs
Environmentally friendly - a solar PV panel could prevent 11 tonnes of CO2 emissions over its lifetime
No maintenance - 'fit and forget' no moving parts and silent operation mean a yearly visual check is normally all that's required
On-going savings - solar panels should continue to generate electricity for 25 years
Boosts property value - a report by Ipsos MORI showed that some people could pay up to £10,000 more for an environmentally friendly property

How much could I save?

This all depends on how many panels you have on your roof and how much electricity you use.
A 12 panel system producing 2.52kW peak retrofit system commands a 41.3p feed-in-tariff.
If you pay 12p per kWh - you could save £245 per year in electricity bills by using just half of the electricity your panels  generate.
The Government will pay to you, via the feed-in-tariff - approx £846 per annum.
The grid supplier will pay 3p per watt - £30.74. Assuming you will return half of the energy you produce, to the grid

A total benefit per annum - £1121 

What to Consider

Each property and the use of energy by the occupiers, will differ and an assessment of your property is the first step to defining your requirements.
In the main, there are three different ways to size a PV system for your property

1. The amount of panels you would like to put down in m²
2. Amount of kWp you wish to generate
3. The amount of money you have available to spend

Planning Permission
If your property is in England or Scotland you don't need planning permission to install a solar PV system as long as it does not protrude more than 200mm above your roof line when installed.
Legislation regarding permitted development rights for the installation of renewable technologies in Wales and Northern Ireland is still yet to be passed; therefore you still need to get planning permission before installing a solar PV system.

Roof Suitability
Ideally, a solar PV system should be installed on a south facing roof which has approx 10 to 20 m² of roof space which is not obstructed by chimneys, dormers or shading from surrounding buildings and trees. Panels can be installed on pitched or flat roofs, although solar tiles can only go on pitched roofs.
The most appropriate roof angle on which to install PV panels is between 30-40° but if your property has a flat roof, a-frames can be installed on which to mount the panels to the required pitch.
While it is recommended that solar PV works most efficiently on south facing roofs, you can install a system on a roof that is east or west facing and still attain good results.

Tables below give average estimates for energy use and cost in different types of residential building (figures provided by EnergyWatch): 

 

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