Off grid inverter
A complete system solution using modular components for off-grid inverters Xantrex XW consists of a number of manageable building blocks: XW inverter/charger, solar charge controller, automatic generator starting module, and system control board.
Grid inverter
Grid-connected inverters are generally divided into photovoltaic power generation grid-connected inverters, wind power generation grid-connected inverters, power equipment power generation grid-connected inverters and other power generation equipment power generation grid-connected inverters. The biggest feature of the grid-connected inverter is the high power and low cost of the system.
Grid-connected inverters are generally used in large-scale photovoltaic power station systems. Many parallel photovoltaic strings are connected to the DC input end of the same centralized inverter. Generally, three-phase IGBT power modules are used for high power, and the power is relatively high. The small one uses field effect transistors, while using a DSP conversion controller to improve the quality of the generated power, making it very close to a sine wave current.
How to distinguish between grid-connected inverters and off-grid inverters
First of all, photovoltaic inverters are also called photovoltaic inverter power regulators. According to the use of inverters in the Jiaotong University Blue Sky distributed photovoltaic power generation system, we can divide them into two types: independent type (off-grid type) and grid-connected type. The classification of each type is mainly based on the purpose of the photovoltaic power generation system. There is no need to go into details. You only need to know that Jiaotong University Blue Sky Photovoltaic Power Generation is divided into these two types according to the different purposes of the photovoltaic system.
The second is that according to the waveform modulation method of the inverter itself, it can be divided into square wave inverter, step wave inverter, sine wave inverter and combined three-phase inverter. This is the inverter produced by Jiaotong University Blue Sky Manufacturer divided by the waveform of the device itself.
Third, according to the photovoltaic power generation grid-connected system used in Jiaotong University Blue Sky, it can be divided into transformer-type inverters and transformer-less inverters. This is mainly a classification of photovoltaic inverters based on different requirements of grid-connected systems.
The difference between grid-connected inverter and off-grid inverter
Whether it is an off-grid inverter or a grid-connected inverter, there is no essential difference in appearance alone. The important thing is the “core”, that is, the functional difference of the inverter itself. It is not ruled out that individual inverter manufacturers will have some unique features. It is easier to understand the appearance design by comparing the functions in the form of diagrams.
Grid inverter
The biggest difference between the grid-connected inverter is that it does not use any battery storage. The DC power generated from the solar panels is directly converted into AC power through inverter and directly fed to the public power grid. However, there are also certain thresholds that must comply with the local power grid. Safety regulations and policies, otherwise grid connection cannot be provided.
Off grid inverter
As the name suggests, an off-grid inverter is a system that is disconnected from the public grid. The DC power generated by the solar panels is first stored in the battery, and then the battery is transported to the off-grid inverter for inversion. The resulting AC power can be directly supplied to the off-grid inverter. When using the load, it can also be returned to the battery for storage. It is more suitable for remote areas without power network coverage, such as deserts, plateaus, and deep forests, and can provide power needs anytime and anywhere.
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