Firstly, it is necessary to determine the scale and installation location of the system. This requires consideration of factors such as local geographical location, climate conditions, available space, as well as local electricity demand and grid conditions. At the same time, it is necessary to evaluate and compare the performance and cost of various photovoltaic modules to select the most suitable one.

Secondly, it is necessary to design the structure and management methods of the system. This includes the selection and layout of key equipment such as support structures, cable connections, inverters and batteries, as well as the control strategies and management methods for system operation. At the same time, it is necessary to design the system for safety and reliability, such as lightning protection, overload protection, short circuit protection, overvoltage protection, and undervoltage protection, to ensure the stability and reliability of the system.

In addition, it is necessary to design energy storage and management methods for the system. This includes the selection and arrangement of batteries, the design of energy storage and control strategies, etc. At the same time, it is necessary to consider how to optimize the utilization and management of system energy, such as energy scheduling and management, energy-saving control, etc., to ensure the economy and sustainability of the system.

Finally, a systematic economic analysis and evaluation are needed. Evaluate and compare investment costs, operating costs, benefits, and lifecycle to determine the economy and feasibility of the system. At the same time, it is necessary to train and manage the operation and management personnel of the system to ensure its safe and reliable operation.

In summary, the design of an off grid photovoltaic power station system is a comprehensive, complex, and long-term task that requires comprehensive consideration of various factors and technical means to achieve optimal design and efficient operation of the system.