Overview of solar lighting
There are many principles for the classification of inverters. For example, according to the number of phases of the inverter output AC voltage, it can be divided into single-phase inverters and three-phase inverters; according to the different types of semiconductor devices used in the inverter, it can be divided into transistor inverters, thyristor inverters and turn-off …
1. Function of the inverter Inverters are an important application aspect of power electronics technology. Power electronics technology is a comprehensive technology in which various technologies such as electricity, electronics, automatic control, computers and semiconductors penetrate and combine organically. As we all know, the function of the rectifier is to rectify the 50Hz alternating current …
The cost of solar cells is very high, accounting for more than 60% of the total cost of solar street lamps. Improving the utilization rate and charging efficiency of solar cells can make more effective use of solar energy and keep the batteries in good working condition. The PWM charging method can gradually reduce the …
Pulse Width Modulation (PWM) three-stage charge controlle Read More »
Parallel type charge and discharge controller The basic circuit principle of the parallel type (also called bypass type) charge and discharge controller is shown in Figure 1. The switching device T1 in the charging circuit of the parallel charge and discharge controller is connected in parallel to the output end of the solar cell array. When …
Parallel and series charge and discharge controllers Read More »
Photovoltaic charge and discharge controllers can be basically divided into six types: parallel type, series type, pulse width modulation (PWM) type, multi-channel controller, intelligent type and maximum power tracking type. 1. Parallel controller When the battery is fully charged, the output of the photovoltaic array is shunted to a parallel resistor or power module using …
The following takes lead-acid battery as an example to introduce the over-discharge protection principle of the controller. 1. Discharge characteristics of lead-acid batteries The discharge characteristics of lead-acid batteries are shown in Figure 1. It can be seen from the discharge curve that the battery discharge process has three stages. In the beginning (OE) stage, …
Basic principle of battery over-discharge protection Read More »
At present, the lead-acid battery is still the most used in the photovoltaic power generation system. Therefore, only the lead-acid battery is used as an example to introduce the basic principle of charging control of the controller. The lead-acid battery charging characteristic curve is shown in Figure 1. It can be seen from the charging …
In the independent operation of photovoltaic power generation system and solar street light, energy storage battery must be equipped. The battery plays the role of storing and regulating electric energy. When there is excess electric energy generated by sufficient sunshine or strong wind, the battery stores the excess electric energy; on the contrary, when the …
According to the difference of electrolyte and separator, VRLA battery can be divided into AGM battery and GEL battery. AGM batteries mainly use AGM (glass fiber) separators, and the electrolyte is adsorbed in the pores of the separators. GEL batteries mainly use PVC SiO2 separators, and the electrolyte is a colloidal electrolyte that has been …
Valve-regulated sealed lead-acid (VRILA) battery is the most common battery used in solar street lamps. Its structure and working principle are introduced as follows. 1. Structure of VRLA battery The main components of VRLA battery are composed of positive plate, negative plate, separator, battery tank cover, sulfuric acid electrolyte, etc. (Figure 1). 2. The role …