What are Photovoltaics?

The word photovoltaic (PV) means light-electricity. It describes the process of converting radiant energy from the sun (Solar energy) directly into electricity. Since solar energy is the most abundant energy source on the planet, photovoltaics can produce virtually unlimited clean and renewable energy.


How do photovoltaic systems turn sunlight into electricity?

Solar power is the ultimate alchemy, using what's free to create something valuable. Over the next 25 years solar is expected to be the fastest-growing alternative source of electric energy.
The basic unit of a PV cell is silicon, which is the second most abundant element in the Earth’s crust but requires intensive processes to mine and develop for PV applications. When light strikes the silicon it produces electrons within the silicon that are conducted away by a metallic grid as direct current (DC).

The PV module is the basic building block of a PV system – any number of modules can be linked together to form a PV “array” to produce the desired electrical output.

The advantage of PV modules is that they have no moving parts and they are very reliable with guaranteed performance of at least 20 to 30 years.

What can photovoltaic do in New Zealand?

PV systems are used extensively to power all sorts of things in today’s world and can play a greater role in supplementing New Zealand’s energy security and supply through distributed generation (DG) where electricity is produced and consumed at the source. This is particularly relevant for urban homes which have experienced a spate of power outages and schools, airports, hospitals, car parks and public buildings that depend on a reliable electricity source.

Do photovoltaic modules work in cloudy weather?

PV modules do generate electricity in cloudy weather, although their output is diminished. Flat PV modules do not need direct sun to work and can generate 50-70% of their rated output under bright overcast conditions.

Do the PV modules work in the cold?

Yes, in fact they usually work better in the cold and generate more power at lower temperatures. This is because PV modules are electronic devices and generate electricity from light, not heat and operate more efficiently at cooler temperatures.

Environmental impact of photovoltaics

PV is the most harmless and silent method of power generation known. The modules operate without noise and produce no green house gas emissions.