The main steps for the design of solar grid-connected systems

- Jan 14, 2019-

(1) Master the basic data


Obtain the installation location of the photovoltaic system, local meteorological data and geographical conditions, and the capacity scale of the solar system.


(2) Site survey


Understand the terrain and landform of the installation site, as well as the orientation, area and specific dimensions of the solar panel installation site. Observe whether there are obstacles such as tall buildings or trees blocking the sunlight, and roughly determine whether it needs to be divided into thousands of sub-array installations. In particular, the BIPV system needs to know the details of the site in detail in order to determine the position of each sub-array and its influence on the installation orientation, inclination, and the like. It is also necessary to plan the location of the building and the location of the access to the grid.


(3) Choosing the right grid-connected inverter


The following should generally be considered when selecting an inverter:


• On-grid or off-grid;


• rated power and maximum current;


• Power conversion efficiency;


• Site environmental assessment;


• Size and quality;


• Nominal DC input and AC output voltage;


• Protection and security features;


• Warranty period and reliability;


• Cost and availability;


• Additional functions (monitoring, charger control system maximum power point tracking, etc.).


For grid-tied solar systems, special grid-connected channel transformers must be equipped with strict requirements for their output waveforms, frequency and voltage, and must have the necessary detection, grid connection, alarm, automatic control and measurement, etc. a range of functions, especially the ability to prevent islanding, to ensure the safety of photovoltaic systems and the grid.