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Photovoltaic inverter is also called photovoltaic inverter power regulator. Photovoltaic inverter can be divided into two types: independent (off-grid) and grid-connected.

Differences and characteristics of off grid inverter and grid connected inverter

  • Xindun
  • December 14, 2020

Off grid inverter

The complete system solution of off-grid inverter with modular components consists of some manageable building blocks: inverter/charger, solar charging controller, automatic generator starting module, and system control board.


Grid connected inverter

Grid-connected inverter is generally divided into photovoltaic grid-connected inverter, wind power Grid-connected inverter, power equipment grid-connected inverter and other power generation equipment grid-connected inverter. The biggest feature of grid connected inverter is the high power and low cost of the system.

Grid-connected inverters are usually used in systems with large photovoltaic power plants. Many parallel photovoltaic groups are connected in series to the DC input of the same centralized inverter. Generally, high-power IGBT power modules are used, low-power field-effect transistors are used, and DSP conversion controllers are used to improve the quality of the generated power. The volume makes it very close to the sine wave current.


Differences and characteristics of off grid inverter and grid connected inverter

How to distinguish grid connected inverter and off grid inverter

Photovoltaic inverter is also called photovoltaic inverter power regulator. Photovoltaic inverter can be divided into two types: independent (off-grid) and grid-connected. These two types of classification are mainly the use of photovoltaic power generation system to divide, can not be studied in depth, just need to be studied. Know that the blue sky photovoltaic power generation is divided into two types according to the different uses of photovoltaic system.

Secondly, the inverter can be divided into square wave inverter, stepped wave inverter, sinusoidal wave inverter and combined three-phase inverter according to the waveform modulation mode of the inverter itself. This is divided by the waveform of the inverter produced by Jiaotong Blue Sky Factory.
Thirdly, according to the grid-connected system of photovoltaic power generation in the blue sky of Jiaotong University, it can be divided into transformer inverter and non-transformer inverter. This is mainly a classification of PV Inverters from different requirements of grid connected systems.

Difference between grid connected inverter and off grid inverter

Whether it is off-grid inverter or grid-connected inverter, there is no essential difference in appearance, the emphasis is on the "core", that is, the difference in the function of the inverter itself, does not rule out that individual inverter manufacturers will have some unique appearance design, or in the form of graphics from the function of a comparison is better understood.


Grid connected inverter

The biggest difference between grid-connected inverters is that without any storage battery, the direct current generated from solar panels is converted directly into alternating current through inversion and merged directly into the public power grid. However, there is also a certain threshold to conform to the relevant safety regulations and policies of the local power grid, otherwise the grid can not be provided.

Off grid inverter

Off-grid inverter as the name implies is out of the public grid system, solar panels emitted by the direct current first stored in the battery, and then by the battery into the off-grid inverter inverted out of the alternating current, can be used directly to the load, can also be returned to the battery storage, for which Remote areas without power network coverage, such as deserts, plateaus and deep forests, can provide electricity demand anytime, anywhere.