Solar Irradiation Map UK and IrelandGraph showing 10 year average for UK insolationData courtesy of: NASA - Surface Meteorology and Solar Energy Data Set ONLINE INSOLATION CALCULATORS BY REGION.  This handy online calculator gives an estimate of how much power you get from the sun at worldwide locations on an average day for every month of the year. However, its data is only for horizontal collectors. Why not make good use of all this free sunshine and consider buying a solar thermal package, some of our solar thermal products, a solar PV system or one of our amazing solar kettles.