First, repair and after-sales
The function of the solar cell is to store and release the electric energy. It can be installed on the pole or buried in the ground. The function of the battery box is to protect the battery from underground. The battery will not be corroded by groundwater. The working principle of the battery is During the day, the electrical energy converted by the solar photovoltaic modules is stored in the body. At night, when the controller commands the time to start discharging, the quality of the products of different technical capabilities is as different as the corresponding price. In the use of solar street light batteries, it is inevitable that there will be no light or some other faults. Traditional controller installations are designed to be installed at the bottom of the pole, so that it is convenient to replace and repair. The installation of the lithium battery is at the bottom of the solar panel, which brings a problem. When there is a fault, we must use the crane or climb to the top tool, which will increase the post-sales cost of the repair. We recommend to increase the cost. The capacity of solar panels and lithium batteries, on the other hand, the lithium battery controller has added automatic half-power function, which extends the rainy days of solar lithium circuit lights. So this drawback is also a fake, as long as the quality of the controller we use is too good, this problem has been solved.
Second, the use of the environment
Solar street lights are now the darling of rural lighting in the country. China's geographical area is different from south to north. The discharge voltage of lithium iron phosphate battery is very stable, generally 3.2V. The voltage after the discharge (mainly refers to the remaining 10% capacity) changes rapidly, and the cut-off voltage is generally 2.5V. Ambient temperature, especially low temperature, will affect the discharge capacity of lithium iron phosphate battery: discharge capacity at -20 °C is 45% of normal temperature capacity, -10 °C is 65% of normal temperature, -5 °C is 80% of normal temperature, 0 °C It is 90% of normal temperature, and the discharge capacity change of 0 °C to 20 °C is very small. So in these cold places in the north, there are some difficulties in using ordinary lithium batteries. However, lithium battery manufacturers have begun to produce lithium batteries suitable for low temperature, but the cost is very high.