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Solar Photovoltaic panels has been around for many decades so the technology is well and truly established. Solar is also the only ‘fit and forget’ technology as it requires virtually no maintenance or service. Most Solar panels come with a 25 year performance guarantee, meaning they will generate at least 80% of their rated power for 25 years. In the last two years the take up of Solar has increased exponentially and consequently the cost of Solar panels has come down drastically. In October 2011 the cost of a Solar installation of up to 20kW was around £ 2.50 per Watt. A year later it is around £1.50 per Watt. On this basis a Solar installation on a house can provide annual returns of between 10-14% and a payback of 6-7 years if you include the savings and Government Tariffs.