Solar cells are devices that directly convert light energy into electricity through the photoelectric or photochemical effect. The thin-film solar cell based on photoelectric effect is the mainstream, while the solar cell based on photochemical effect is still in its infancy. The sun shines on the semiconductor p-N junction, creating new holes called electron pairs. Under the action of the p-N junction electric field, the hole flows from N region to P region, and the electron flows from P region to N region. After the circuit is connected, the current is formed.
Solar panels on the roof convert sunlight into DC electricity. The uninterruptible power supply (UPS) converts the DC energy to AC 220V / 50Hz.
This power can be used entirely for local equipment, partly for electricity, and the rest sold to utilities, or all of it.
It is strongly recommended that this expensive facility be protected from lightning strikes.
Advantages and disadvantages of solar photovoltaic cells
1, the advantages of
No danger of exhaustion; Absolutely clean (no pollution, except battery); Not limited by the geographical distribution of resources; Power generation can be generated nearby at the place where electricity is used; High energy quality; Users are emotionally receptive; Energy acquisition takes a short time; Power supply system works reliably.
2 and disadvantages
The energy distribution density of irradiation is small; The energy obtained is related to weather conditions such as four seasons, day and night, cloudy and sunny. The cost is relatively high.