Maximum Power Point Tracking (MPPT) system is a kind of electrical system that enables the photovoltaic panels to output more electricity by adjusting the working status of electrical modules. It can effectively store the DC electricity from solar panels in the battery, which can effectively solve the problem of shortage of electricity for living and industry in remote areas and tourist areas that cannot be covered by the conventional power grid, and does not cause any environmental pollution. By using the leading Power Catcher power tracking technology in the industry to realize the high energy tracking of solar panels, the products can quickly and accurately track the power points of photovoltaic arrays in any environment, and obtain the high efficiency energy of solar panels in real time. Significantly improve the efficiency of solar systems. It is widely used in solar off-grid photovoltaic system, and it is the core control component of off-grid photovoltaic system to manage the work of solar panels and batteries. This product can be connected with lcd screen, bluetooth communication module, PC host computer, dynamic display running status, running parameters, controller log, control parameters, etc. Users can consult the parameters and modify the control parameters to meet different system requirements. Controller adopts standard Modbus communication protocol, which is convenient for users to expand and modify the parameters of the system. Can maximize the convenience of users to complete different remote monitoring requirements. The controller has comprehensive electronic fault self-testing function and powerful electronic protection function to avoid the damage of product parts due to installation errors and system failures.