To make a solar traffic sign, you need 100 LED bulbs. How to calculate the size of batteries and solar panels?

The LED bulb is 4W, and the system only needs to work for 6 hours at night. The required energy is:

W=4*6=24Wh

According to the lighting parameters in Table 6- 1,

The panel power can be calculated as follows:

P= =5.3W (6-2)

Table 6- 1 lighting parameter table

Classification of lighting areas: annual illumination amount kw/m2 and average daily illumination time h.

Rich area 586 5. 10-5.42

Rich area 502-586

Available area 4 19-502 3.82-4. 14

poor area

Therefore, the system can complete the task by selecting the 20W battery panel with minimum power. At present, the price of monocrystalline silicon panel is 12 yuan /W, and 240 yuan is needed to buy the panel.