The RSPB nature reserve at Leighton Moss near Lancaster has had 10 solar panels on the roof for the last 6 and 1/2 years. In that time, it has generated 8749 kWh of electricity, according to the display. So that's about 1300 kWh per year. Which could be worth at least £100 of electricity per year.I wonder how much they cost to install?
The low power rating also raises questions, because 0.13kW would only run light bulbs or TV sets - things that aren't designed to produce heat. However, if the panels just add to the total electricity coming into the house, meaning that less is taken from the grid, then perhaps they will provide an interesting alternative.