This website uses cookies to help us make improvements to content and performance. To find out more about cookies, please click on more information below.
Close this message --- More Information

Solar PV - Photovoltaic Solar Panels from Barres


Photovoltaic (PV) solar panels turn light in to electricity. They rely on light rather than heat so although they work best in direct sunlight, they will still produce power even on a dull day. Barres can supply and install both domestic and commercial PV systems.

What do I need in order to install solar PV panels?
The ideal situation is an unshaded, south facing roof in good condition with plenty of space. Panels can also be mounted on a east/west facing roof and on the ground using a variety of methods. A normal electricity connection to the grid is also required.

What size of system can I install?
For domestic properties, the normal size of a PV system is up to 4kW. Above this size, feed in tariff rates drop and grid planning permission is required which adds extra cost and is not as cost effective unless going significantly beyond 4kW. The roof space available also becomes an issue when going above 4kW.

For commercial properties the maximum size is down to available roof space and budget, although the feed in tariff bands should be taken into account to ensure systems don't fall into a higher and lower paid band.

How much energy is generated by solar PV panels?
It varies depending on your location in the UK, how much space you have for panels and whether you have any shading issues. A typical domestic system of around 4kW will usually generate between 3200 and 3600kWh per year.

Benefits of Solar PV

What are the benefits of installing Solar PV?
There are three main financial benefits for installing Solar PV:

  1. Feed In Tariff - pays a set amount for each unit of electricity produced, regardless of whether it is used or not.
  2. Export tariff - pays a set amount on 50% of the units that are produced, regardless of whether they are used or not.
  3. Reduction in your electricity bill, if the power can be utilised when it is being produced.

For more information on the feed in tariff and export tariff, along with current rates, please see the financial incentives section below.

How do I get paid?
Your PV system will have generation meter which reads how much electricity your system produces. Your electricity supplier will as for a reading, usually on a quarterly basis and the feed in tariff and export tariff are paid based on this figure. The amount you receive per unit will depend on the tariffs at the time you installed your system.

How much will I get paid?
The diagram on the left illustrates a 4kW system located in Inverness, generating 3385kWh per year. At the current feed in tariff rate of 4.14p, plus the export tariff of 5.03p, this system will generate an annual income of 462.00. This assumes that you also use 50% of the energy generated. Together, this equates to a return of 7% in the first year.

Financial Incentives - Other

Feed in Tariff (FIT)
Applies to: Solar PV

The feed in tariff is specifically for electricity generating renewable technologies such as Solar PV, small scale Hydro and Wind Turbines. It pays a certain amount for every kW of electricity produced, regardless of whether that electricity has been used or not, and is paid for a total of 20 years. An EPC with a rating of D or higher is required to achieve the highest rates. Current rates for the feed in tariff are as follows:

For up to date tariff information, please visit the Ofgem website

As of August 2012, the feed in tariff is set to be reviewed each quarter and dependant on the amount of PV installed within that time, the tariff reduced accordingly. Click here for more information on the Feed in Tariff.

Export Tariff
Applies to: Solar PV

The export tariff is in addition to the feed in tariff, and pays an additional amount on 50% of all electricity produced by the solar PV panels. This works on the assumption that 50% of the electricity produced is used on site, and 50% is exported back to the grid.

For up to date tariff information, please visit the Ofgem website

Other Loans and Grants
Depending on your location, other financial help may be available.

In Scotland: Interest free loans of up to 10,000 over 12 years, maximum loan and repayment term will depend on the technology being installed. Click here for more information on the Home Renewables Loans Scheme.

For full details on all available grants, loans and other financial help, please visit the Energy Savings Trust website:

Why Choose PV from Barres?


We are pleased to partner with Viessmann, offering high quality panels manufactured in Germany. Coupled with SMA Sunny Boy inverters, our systems use equipment from companies who have a proven track record in Solar PV.

Viessmann panels have very closely matched cells. Many panels have an actual output of +5%/-5%. Viessmann panels have +5%/-0% which means that if a Viessmann panel is out of tolerance, you will always get more and not less. There are many cheaper chinese panels on the market which do not come with the same guarantees and may not give the rated output.

At Barres we stick with the products we know and trust, and you get a reliable system that is designed to last.

For a no obligation survey:

Barres is part of the G&A Barnie Group
GA Barnie - --- Barres - --- Bartec - --- Barems -