1. Leave enough margin for the inverter

Usually off-grid photovoltaic power generation is a power supply system for a specific load. During the design process, the rated power of the load connected to the system should be calculated and checked, and the output power of the inverter used should be determined according to the total power of the load. Considering the inrush current, starting power and reactive power required by some special loads during startup, the possible influence and demand on the inverter, a sufficient margin should be reserved for the inverter. Once the capacity of the inverter is determined, the capacity of the connected load cannot be expanded or increased at will, so the off-grid photovoltaic power generation system should leave enough margin for the inverter.

2. Fully consider the matching of various loads and inverters

The off-grid photovoltaic power generation system should fully consider the matching of various loads and inverters, especially if there are inductive loads such as washing machines, refrigerators, air conditioners and other inductive loads with motors, sine waves must be selected and equipped. Or a quasi-sine wave inverter to meet the demand of the inductive load on the inverter output waveform.

3. Calculate the daily average working time and electricity consumption of each load

The capacity of the photovoltaic array and the capacity of the battery are designed based on the customer's needs, so as to meet the user's electricity demand and control the overall investment cost.

4. The design is based on the amount of solar radiation in the worst month of the year

The off-grid system needs to ensure that the month with the least amount of radiation, the photovoltaic system can still guarantee power supply (usually the worst month of the year is in winter. This is different from the grid-connected system. The design of the grid-connected power station is based on the total amount of solar radiation throughout the year. ) Therefore, the off-grid photovoltaic power generation system usually designs the inclination angle of the photovoltaic array according to the optimal inclination angle of the worst month. That is to say, the array inclination angle of the off-grid photovoltaic power generation system is usually 2° to 8° larger than the local geographic latitude angle to take into account the weak solar radiation in winter.

Summary: Only by doing a good job of system design can the power generation of the power station be maximized. In specific projects, it is recommended to refer to and apply it flexibly, and not blindly design.