Before you start...
If you're thinking about installing a system to generate your own heat, make sure your home is as well insulated as it can be so your heat-producing system can be most efficient.
Stop wasting energy; start taking action! This is the section to get you started on energy-saving, whether it's changing your habits or improving your home – save energy and save money!
The better insulated your home is, the less money you'll spend heating it. Find out more about different types of insulation, including draught-proofing, double glazing, and insulation for lofts and walls.
The latest on energy-efficient boilers to save you energy and money, and the right controls to use as little energy as possible, whatever the age of your boiler. No boiler? Find out about controls for electric systems too.
Renewable and low-carbon technologies are good for the environment and good for your pocket too - with government financial incentives, it’s never been a better time to install. Find out more now!
Get inspiration for your own community projects from a range of case studies in PDF and video format; find extensive advice about funding your project; and explore our range of project tools.
As well as the guidelines below, you can try our Renewable Selector to see if your home is suitable for solar PV, and if it's not, find other possibilities.
Your roof should ideally face due south at a pitched angle of around 30° from the horizontal to give the best overall annual performance. Installations at any pitch and facing anywhere to the south of due east and due west are feasible, although output and income will be reduced. Installation is not recommended on roofs facing north.
This table shows the percentage of the ideal annual output you will get for a system with a different orientation and tilt:
The chart below shows a typical seasonal spread of energy generation for a system of 3kWp facing south. The winter months generate significantly less electricity compared to the summer months.
The amount of electricity generated by a solar PV system can also vary depending on where you live. Northern areas receive slightly less energy from the sun over the year. For example, a 1kWp system will generate less electricity in Northern Scotland than it would in Cornwall. However, solar electricity is still worthwhile - the differences aren’t substantial. You can get an estimate of how much a system will generate in your location (and how much it will earn) using our Solar Energy Calculator.
Solar PV arrays are made up of modules of about 1.5 square metres which allows most available roof shapes to be accommodated. Typical UK installations are around 15 to 25 square metres. For example, a 3kWp system could comprise 15 panels taking up an area of 20 square metres and will generate roughly 2,500kWh per annum.
All the modules are connected, so any shading on a single module will affect the performance of the whole array. A system can tolerate some shading early or late in the day without much reduction of overall output but it should not be shaded between 10am and 4pm. Nearby trees, chimneys, TV aerials and vent pipes are all common causes of shading and should be accounted for before any installation.
Solar electricity doesn’t necessarily require direct sunlight and can still generate electricity on cloudy days. You could get as much as a third of the energy on a cloudy day as you would get on a sunny day at the same time of year.
In England, Wales and Scotland, you don't need planning permission for most home solar electricity systems, as long as they're below a certain size - but you should check with your local planning officer, especially if your home is a listed building, or in a conservation area or World Heritage Site: we can only give general guidance here. You'll find full details on the government's legislation sites:
Your local Building Control Office may want to check that your roof structure is suitable – your installer should be able to advise on this.
In Scotland, permitted unless:
The solar PV equipment must, as far as is reasonably practical, minimise its effect on the amenity of the area and be removed when it is no longer needed or used for domestic microgeneration.
Many building insurance will cover you under the terms of your current policy if you have solar PV panels installed on the roof of your home. But always contact your current insurance provider for advice before having solar PV panels installed, because:
As a precaution we recommend that you confirm in writing with your insurance provider that you have had a solar PV system installed and ask them to confirm in writing that they have received your notification and the terms of the cover being provided by them. If you purchase a home with a solar PV system already installed or change insurance provider later, make sure that they are aware of system before accepting any quote.
Generating energy – what suits your home? Use our online tool to find the technologies that will work for you.
For independent advice on how to save energy in your home, call our helpline free during office hours:
and choose option 3
Am gyngor annibynnol ar sut arbed ynni yn eich cartref, ffoniwch ein llinell gymorth am ddim yn ystod oriau’r swyddfa:
a dewiswch opsiwn 3