The importance of batteries in solar panels

- Jan 28, 2019-

The battery (also known as the storage battery) is an important component of the solar power supply system. Its main function is to store the electric energy generated by the solar panel in the battery immediately for use by the electric equipment. The battery has the function of storing electric energy and stabilizing the voltage.


The main technical parameters of the battery are voltage and capacity. The voltage refers to the rated voltage of the battery, that is, the normal working voltage, and generally has 3V, 6V, 12V, 24V, 36V, and the like. Capacity refers to the ability of the battery to store electricity. Generally, 4AH, 6AH, 12AH, 20AH, 40AH, 60AH, 120AH, etc. are commonly used. For example, in the case of a 40AH battery, it means that when the battery is charged with 4A current, it can be fully charged for 10 hours; if it is charged with 1A current, it takes 40 hours to be fully charged. The reverse is also true when discharging. Under normal circumstances, the charge and discharge time of the battery is preferably 10 hours of charge and discharge rate.


When the battery is charged by the solar battery, the voltage of the solar battery should exceed 20%-30% of the working voltage of the battery to ensure normal charging of the battery. If you need to charge 8V battery for 8V battery, you need to use 15-18V solar battery for charging 12V battery.


As for the use of solar panels to charge the battery, how to match, mainly depend on your actual needs. The solar power generation board cannot supply power to the electrical equipment without using the battery. The reasons are:

1. A solar power panel is simply a device that converts light energy into electrical energy and cannot store electrical energy.

2. The solar power board can generate a high electromotive force when the light is strong; when the light is weak, it can only produce a low electromotive force. That is, the output voltage is very unstable, and it is impossible to supply power to the electrical equipment normally.

Therefore, the solar power generation system must be composed of a solar power generation board, a voltage conversion module, and a storage battery. The voltage conversion module converts the unstable voltage generated by the solar power generation panel into a voltage suitable for charging the battery, and charges the battery. The electrical equipment is a relatively stable supply voltage from the battery.