Something You Should Know About Off-Grid Solar Inverter

September 22,2021

What is an off-grid inverter?


The grid-connected inverter sends energy directly to the grid, so it needs to track the frequency and phase of the grid, which is equivalent to a current source. The off-grid inverter is equivalent to building an independent small grid by itself, mainly to control its own voltage, which is a voltage source. Grid-connected inverters do not need energy storage, but the energy cannot be controlled. As much as the photovoltaic power is sent to the grid, it doesn't matter whether people want it or not, the grid doesn't like it very much. Off-grid generally requires energy storage, and does not send energy to the grid, and the grid has no right to interfere.


The off-grid inverter can work independently after leaving the grid, which is equivalent to an independent small grid, mainly to control its own voltage, which is a voltage source. It can carry loads such as resistance, capacitance and motor inductance, fast strain, anti-interference, strong adaptability and practicability, and is the preferred power product for emergency power supply and outdoor power supply.


Off-grid inverters generally need to be connected to batteries. Because photovoltaic power generation is unstable and the load is also unstable, batteries are needed to balance the energy. When the photovoltaic power generation is greater than the load, the excess energy charges the battery. When the photovoltaic power generation is less than the load, The insufficient energy is provided by the battery.



Classification of off-grid solar inverters


In the AC power solar generation system, the inverter is an indispensable part. At present, due to various technical or policy reasons, it will take a long time for all independent photovoltaic AC power generation systems to be connected to the national unified power grid. Therefore, the market distinguishes solar inverters into two types: off-grid solar inverters and grid-connected solar inverters.




  1. It adopts 16-bit single-chip microcomputer or 32-bit DSP microprocessor for control.


  1. The PWM control mode greatly improves efficiency.


  1. Use digital or LCD to display various operating parameters, and related parameters can be set.


  1. Square wave, modified wave, sine wave output. Sine wave output, waveform distortion rate is less than 5%.


  1. The voltage regulation accuracy is high, and the output accuracy is generally less than plus or minus 3% under the rated load.


  1. It has a slow start function to avoid high current impact on the battery and load.


  1. High frequency transformer isolation, small size and light weight.


  1. Equipped with standard R232/485 communication interface, which is convenient for remote communication control.


  1. It can be used in environments above 5500 meters above sea level.


  1. With input reverse connection protection, input undervoltage protection, input overvoltage protection, output overvoltage protection, output overload protection, output short circuit protection, overheating protection and other protection functions.


Applicable place


Off-grid solar inverters are suitable for power systems, communication systems, railway systems, shipping, hospitals, shopping malls, schools, outdoor and other places. It can be connected to the mains to charge the battery. It can be set as Fengguang photoelectric priority mains backup, or mains power Priority is given to wind and photoelectric backup.


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