What should be paid attention to in off-grid solar photovoltaic power generation systems?

The design of off-grid solar photovoltaic power system includes two aspects: capacity design and hardware design. The main purpose of off-grid solar photovoltaic power generation system capacity design is to calculate the number of solar cell modules and batteries required for the off-grid solar photovoltaic power generation system to work reliably throughout the year. At the same time, attention should be paid to coordinating the maximum work of off-grid solar photovoltaic power generation systems

The relationship between reliability and cost is to minimize the cost of off-grid solar photovoltaic power generation system on the basis of meeting reliability. The main purpose of hardware design of off-grid solar photovoltaic power generation system is to select suitable hardware equipment according to the actual situation, including solar cell module selection, bracket design, controller and inverter selection, cable selection, control and measurement system

System design, lightning protection design, power distribution system design, etc. When designing off-grid solar photovoltaic power generation system, it is necessary to comprehensively consider both software and hardware. For different types of off-grid solar photovoltaic power generation systems, the content of software design is also different.

Before designing an off-grid solar photovoltaic power generation system, it is necessary to understand and obtain some basic data necessary for calculation and equipment selection, such as the geographical location of the off-grid solar photovoltaic power generation system installation, including location, latitude, longitude and altitude; The meteorological data of this area includes monthly total solar radiation, direct radiation and scattered radiation, annual average temperature and maximum and minimum temperatures, longest continuous rainy days, maximum wind speed, ice, electricity, snowfall and other special meteorological conditions. The designed off-grid solar photovoltaic power generation system is required to be advanced, complete, scalable and highly intelligent to ensure the safety, reliability and economy of the system.

① Advanced nature. With the country's increasing emphasis on renewable energy, the development and utilization of renewable energy has become the development trend of new energy strategy. According to the characteristics of local sunshine conditions and electrical load, it is an advanced power supply construction scheme to choose to use solar resources to build an off-grid solar photovoltaic power generation system, which not only saves energy and is environmentally friendly, but also avoids the huge investment of using mains power to lay cables (electrical load far away from mains power).

② Completeness. Off-grid solar photovoltaic power generation system includes: solar cell module, battery, controller, inverter and other components. The off-grid solar photovoltaic power generation system can independently provide power to the outside world. The off-grid solar photovoltaic power generation system should have a complete control system, energy storage system, power conversion, lightning protection grounding system, etc., and should form a unified whole with integrity.

③ Scalability. With the rapid development of solar photovoltaic power generation technology, the functions of off-grid solar photovoltaic power generation systems will become more and more powerful. This requires that the off-grid solar photovoltaic power generation system can adapt to the expansion and upgrading of the system. The solar cell modules of the off-grid solar photovoltaic power generation system should be composed of parallel module structures. When the system needs to be expanded, solar cell modules can be directly installed in parallel. The controller or inverter should also adopt a modular structure. When the system needs to be upgraded, the modules of the system can be directly expanded, and the original equipment and components can be retained, so that the off-grid solar photovoltaic power generation system has good scalability.

④ High degree of intelligence. The designed off-grid solar photovoltaic power generation system should not need any operation during use. The controller can control the output of the load end according to the capacity of solar cell modules and storage batteries. All functions are automatically controlled by microprocessor. It should also be able to detect the working state of off-grid solar photovoltaic power generation system in real time, collect the status data of the main components of off-grid solar photovoltaic power generation system regularly or in real time and upload it to the control center. Through computer analysis, the working status of the equipment in real time.

The design of off-grid solar photovoltaic power generation system must have high reliability to ensure normal use under harsh conditions. At the same time, the system is required to be easy to operate and maintain, which is convenient for users to operate and maintain daily. The design, manufacture and construction of the complete off-grid solar photovoltaic power generation system should be low-cost, and the selection of equipment should be standardized and modularized to improve the universal interchangeability of spare parts. The system is required to reserve expansion interfaces to facilitate the expansion of scale and capacity in the future.