Off-grid photovoltaic inverters are the core components of off-grid photovoltaic power plants or power supplies. Therefore, the choice of off-grid photovoltaic inverters is particularly important.

Selection of off-grid photovoltaic inverter

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  • Xindun
  • September 10, 2020

Off-grid photovoltaic inverter is the core components of off-grid photovoltaic power plants or power supplies, and is the basic prerequisite for the normal operation of off-grid photovoltaic power generation systems. Therefore, the choice of off-grid photovoltaic inverters is particularly important.


selection of off-grid photovoltaic inverter


 When selecting an off-grid photovoltaic inverter, the following technical indicators should generally be considered:

1. Rated output power and load capacity.

The rated output power of the inverter indicates the ability of the photovoltaic inverter to supply power to the load. The rated output power of the photovoltaic inverter should be greater than the sum of the electrical power of the equipment under the maximum load.


2. Adjustability of output voltage.

An off-grid inverter converts the energy stored in the battery into alternating current. Generally, the battery is affected by its own charging and discharging, and its output voltage varies widely. For example, a nominal 12V battery has a voltage value that can vary from 10.8 to 14.4V. A good quality inverter can maintain a relatively stable output when the battery voltage changes greatly, and the voltage deviation should be within ±15% of the rated value.


3. Waveform distortion of the output voltage.

According to the waveform, the inverter can be divided into square wave inverter pure sine wave inverter. The square wave inverter has a simple circuit, low price, and high efficiency, but the waveform is seriously distorted and contains a large number of higher harmonics, which cannot drive inductive loads. When choosing an inverter for off-grid photovoltaic power plants, it is best to choose a pure sine wave waveform. Although the price of pure sine wave inverter is higher than that of square wave, it has strong versatility and can meet the normal operation of various loads.


4. The efficiency of the inverter.

The efficiency of the inverter = output power/input power, representing the size of the inverter's own power loss. This value is generally greater than 85%.


5. Protection function.

The protection function is an important indicator to measure the performance of photovoltaic off-grid inverter products. The inverter must have a complete self-protection function to ensure the safe and stable power output of the photovoltaic system. Common protection functions include: undervoltage protection, overvoltage protection, overtemperature protection, overload protection, and short circuit protection.

If you are still confused about the selection of off-grid photovoltaic inverters, please contact Xindun, and we will have dedicated personnel to answer your questions.