Photovoltaic (PV)
Photovoltaic (PV) is a technology that converts sunlight directly into electricity using semiconductor materials that generate a voltage when exposed to light. It powers solar panels and feeds clean energy into homes, businesses, and the grid.
How Photovoltaic (PV) Works
- Sunlight contains photons. When photons strike a semiconductor such as silicon, they knock electrons loose.
- The freed electrons flow through an electric field built into the cell, creating a direct current (DC).
- Multiple cells are wired together into a module, and many modules form a solar panel. Panels are connected in series/parallel to make a PV array that can produce kilowatts of power.
Why PV Matters
- PV generates electricity without burning fossil fuels, so it produces no greenhouse‑gas emissions during operation.
- The cost of PV has fallen dramatically; global average module prices dropped from about $70 / W in 2010 to under $0.20 / W in 2023.
- It can be installed on rooftops, in fields, or on building facades, bringing power closer to where it is used.
A Concrete Example
A typical 5 kW residential PV system in Israel receives roughly 5.5 kWh / m² day⁻¹ of solar irradiance. Over a year it can generate about 7,500 kWh of electricity—enough to cover most of an average Israeli household’s consumption (≈9,000 kWh yr⁻¹). At the current feed‑in tariff of ₪0.55 /kWh, such a system can offset roughly ₪4,125 in electricity bills each year.
Relevance to Solar Energy in Israel
- Israel enjoys one of the world’s highest solar insolation levels, making PV especially efficient.
- Government programs such as the “Solar for All” initiative and net‑metering rules have encouraged rapid PV deployment; by 2023 the country installed over 5 GW of PV capacity, supplying roughly 10 % of its total electricity demand.
- Ongoing research in thin‑film and bifacial modules aims to boost yields on the limited land area available.