Solar Electricity (PV)

Costs: £4,500-£5,500 I Annual Savings: £560 I Payback: 10 years I Profit: £5000

You can generate cheap, green electricity from sunlight, even here in Britain.

Solar electricity systems capture the sun's energy using photovoltaic (PV) cells. The cells convert sunlight into electricity, and this electricity can power your lighting and appliances. You can receive payments for the electricity you generate, as well as for exporting any electricity you don’t use to the grid.

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The basics

The cells used in solar panels are now so efficient that they will work well anywhere in Britain particularly if you have a southerly orientated roof. A typical home PV system can produce around 50% of the electricity used in an average household per year (Department of Energy and Climate Change), saving around £140 on your electricity bills.

In 2010, the government introduced the Feed-in-Tariff scheme to encourage uptake of solar panels. Under this scheme, your energy supplier pays you for any energy that you generate using your solar panels, as well as any excess that you export to the grid. The average installation can make around £420 a year in FITs at current tariff rates. You can alternatively get the installation paid for using a loan from the Green Deal finance scheme.

Fitting panels is not a complex process, and you can get them fitted with very little disruption. You do need to ensure that you get a qualified installer to qualify for the FITs.

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What is a Renewable Obligation Certificate (ROC)?
The government created an obligation for electricity suppliers to encourage homeowners to fit specific renewable micro generation systems. For domestic electricity generation, this system has now been superseded with the Feed in Tariff (FIT).
Do I need a three phase electricity supply to install solar PV?
Systems with up to about 10kW peak power don't need more than a single phase electricity supply, however it is very unlikely that your system will exceed 4 kW peak power. Your installer will advise you exactly what is required.
How are solar PV panels fixed to the roof?
This will depend on the roof, but typically solar PV panels are fixed using rigid stainless steel brackets that are fixed directly to your roof rafters. The brackets hook out from underneath your existing tiles. Tiles or slates should not be drilled to fit the panels, nor should mastic/silicone be used to weatherproof your roof. Solar panels can be fitted to any roof type except thatched roofs.
How much do the solar PV panels weigh?
Solar PV panels typically weigh about 13kg per m2.
Are solar PV panels fragile?
Solar PV panels are very robust; they are designed to withstand the normal stresses and strains subjected to them by nature. You can ensure that your panels are robust by purchasing only MCS accredited panels.
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