Residential Solar PV
Quite simply, Solar PV panels use daylight and convert it into electricity.
Panels are made up of a number of ‘cells’ made of a semi-conducting material, usually silicon. When photons from sunlight hit the cell, it displaces electrons, causing an electrical potential difference, and this in turn causes current to flow. This electricity is captured by metallic tabs in the cell.
The panels are wired together to form an ‘array’ on the roof, and these are wired to an inverter which changes the Direct Current (DC) electricity to Alternating Current (AC), so it can be used in the building. If during the day you generate more electricity than you are using, then any excess will flow back to the grid.
PV panels work all year round during daylight hours, even on dull and overcast days as they use the light from the sun rather than direct sunlight.