When your PV system produces more electricity than you need, the surplus will flow back into the national grid. Your electricity supplier will pay you extra for this surplus power, to reduce your future electricity bills.
Yes. Solar panel manufacturing technology has now advanced to a level that panels will now produce green electricity even in an overcast cloudy day.
There is no need to change your existing electricity supplier unless you want to, and if you do we will help you.
The size of solar system you need depends on several factors such as how much electricity you use, how much daylight is available where you are, the size of your roof, and how much you are willing to invest. After talking through your requirements we will recommend the size of system you use.
PV Solar systems are silent in operation, have no moving parts and require very little maintenance. Dust or dirt may cause a power reduction. The modules can be cleaned with a hose and clean water.