Friday 15 July 2011

Economics of Solar

upto £1,621 a year for the next 25 years? Whats the deal?

Ok, so this is a best case scenario but it is certainly achievable.  This example would apply to retrofit installations and not new builds (new builds have a lower but still comparable subsidy)
It is based on a 4.0kWp output which means (Kilowatts of power produced at the installations peak, for example a bright sunny May/June Day). This is the maximum size an installation is allowed to be to qualify for the maximum 43.1p being offered as part of the scheme.
For a system of that size you would need a south facing roof of at least 24 square metres, that being based on panel sizes of 1.5m x 1m (1.5 square metres each panel), 16 panels each producing 250w = 4.0kWp  and finally 16 panels x 1.5 square metres = 24 square metres. 
The penultimate fact to consider is that of kWh/yr (Kilowatt hours per year). This is what the whole system will produce over the course of a year and will look something like this;
  chart of kw  

The total of this graph will then give you the crucial Kilowatts of hours produced for the year. Say in this instance the figure was 3615 kWh/yr. The subsidy being applied at 43.1p per kW would mean the direct income would be 3615 x £0.431 = £1,558.07. This being based on approximately 50% of what is produced being utilised at source and the other 50% being feed back to the grid.
In addition to this you could expect to receive a further £56 from the electricity exported and an approximate saving on your electric bill of £226. So, you would generate £1,621 and with your savings as well you could stand to pocket £1,847 per year. Over 25 years that’s £46,175.
The final point to consider is the payback period and that’s why we are here to try and give you the best products at the best prices. Perfection is our aim, quality is our achievement and our price promise is your security.