Method 1:
The photoelectric conversion board (silicon photovoltaic panel) can be used directly. But to have enough power, you need a large-area silicon light plate, which is expensive and bulky.
Method 2:
You can also focus on sunlight to heat water and use water vapor to run a generator to produce water. 'electricity. This technology is complex.
Solar panel, one or two mobile phone batteries connected in series, a diode, a PNP transistor, one or more LED lamp beads (it is better to add a limiting resistor current, multiple LEDs are required for one battery) When two batteries are connected in parallel or series, the LEDs must also be connected in series). The triode base is polarized with a solar panel, the collector is connected to the LED et the base is connected to the positive electrode of the battery. As shown in the image below, the solar panel does not generate electricity at night, but there is a leakage current, which simply provides a bias current to the transistor, making it conductive. The mobile phone lithium battery has a protective plate and will automatically shut down when fully charged.