Due to the extremely unstable input energy of solar photovoltaic power generation systems, a battery system is generally required to work, and solar lighting fixtures are no exception, requiring a battery to work.

The selection of battery capacity generally follows the following principles: firstly, on the premise of meeting the requirements for night lighting, the energy of the solar panel components during the day should be stored as much as possible, while also being able to store the electrical energy needed for continuous rainy and cloudy night lighting.

2. Selection of packaging forms for solar panels

At present, there are two main forms of packaging for solar panels: lamination and drip coating. The lamination process can ensure a working life of over 25 years for solar panels, while drip coating, although aesthetically pleasing at the time, only has a working life of 1-2 years.

3. Selection of solar panel power

The output power Wp of the solar panel we are referring to is the output power of the solar panel under standard solar conditions, namely the 101 standard defined by the European Commission, radiation intensity of 1000W/m2, atmospheric quality of AM1.5, and battery temperature of 25 ℃.

This condition is similar to the sunlight conditions during peacetime, sunny days, and noon. It is not as some people imagine that as long as there is sunlight, there will be a rated output power. They even believe that solar panels can be used normally under daylight lamps at night.

This means that the output power of a solar panel is random, and the output power of the same solar panel varies at different times and locations.

Therefore, when choosing solar panels, the focus is on the power of the solar cells. Generally speaking, the power of the solar panel is proportional to the area of the solar chip. The area of solar panel chips is not exactly equal to the area of solar packaging panels, because some solar panels, although large, have wide gaps in the arrangement of solar chips, and the power of such solar panels may not be high.