In scientific terms, (solar) photovoltaic is the transmutation of atom particles from light to electricity.
In simpler terms, natural daylight is absorbed by PV panels installed on your roof, the panels turn the daylight into electricity which is then passed to a box, known as an inverter – normally installed in your loft.
The inverter’s job is to convert the electricity produced by the panels from DC (direct current) into AC (alternating current) so that it is usable by your home – which runs off AC current, as opposed to DC.
The solar panels are installed on a mounting frame which is around 2 inches above the roof line – so there is no weight bearing directly on the tiles/slates. There are also no holes drilled into your roof, so there’s no risk of leaks later on.