Another function of the charge-discharge controller is over-discharge control protection, that is, over-discharge termination voltage protection. Most batteries are not allowed to over-discharge, which can lead to a serious decline in battery performance and life. The EL tester over-discharge controller is usually an electronic switch, when the discharge voltage of the battery is lower than the set value, cut off the load circuit, stop the discharge, in order to achieve the purpose of protecting the battery. The EL tester battery discharge protection setting value is usually determined according to the type and performance of the battery, for example, the voltage of the overdischarge protection point of the 12V lead-acid battery is generally set to: 11The voltage of the over-discharge protection point of the 10V and 24V systems is 2220V, while the cut-off voltage for a single lithium-ion battery is set to 3About 2v.
The full name of solar controller is photovoltaic charge and discharge controller, which is an automatic control device that controls the solar cell array to charge the battery and the battery to supply power to the solar inverter load in the photovoltaic power generation system of the EL tester. It can set control conditions according to the charging and discharging characteristics of the battery to control the power output of the solar cell module and the battery to the load, and its main function is to protect the battery and stabilize the working state of the power station. According to the function and circuit structure, the photovoltaic controller can be divided into switching controller, pulse width modulation controller, pulse width modulation controller with MPPT function and intelligent controller.