All PV cells have two layers of semi-conductors, one positively charged and one negatively charged. When light shines on the semi-conductor, the electric field across the junction between these two layers causes electricity to flow, generating DC (direct current). The greater the intensity of the light, the greater the flow of electricity.A photovoltaic system therefore does not need bright sunlight in order to operate. It can also generate electricity on cloudy days. Due to the reflection of sunlight, days with slight cloud can even result in higher energy yields than days with a completely cloudless sky.
The PV Array is installed in the best location to maximize the power output, for example in a residential installation on the roof. The PV modules are connected in series to generate a direct current (DC).
The Inverter will convert this direct current to alternating current (AC) at grid rating . Each kWp installed in the UK will generate, on average, 800kWh. This will vary depending on orientation and location.
This AC generated by your PV system is connected into the main distribution board for the building. Here it is used the same as the electricity that would have been drawn from the grid.
In times when you are producing more than you are using, any excess is fed back to the grid while in times of excess demand; this is topped up by drawing from the grid.
The generation meter will show the total amount of electricity produced by the PV Array.
kWp = Kilowatt peak (measure of the peak output of the Solar PV system)
kWh= Kilowatt per hour of energy produced.
React 4U
The PV Array is installed in the best location to maximize the power output, for example in a residential installation on the roof. The PV modules are connected in series to generate a direct current (DC).
The Inverter will convert this direct current to alternating current (AC) at grid rating . Each kWp installed in the UK will generate, on average, 800kWh. This will vary depending on orientation and location.
This AC generated by your PV system is connected into the main distribution board for the building. Here it is used the same as the electricity that would have been drawn from the grid.
In times when you are producing more than you are using, any excess is fed back to the grid while in times of excess demand; this is topped up by drawing from the grid.
The generation meter will show the total amount of electricity produced by the PV Array. 
