A photovoltaic inverter (also called a power supply) is a device that converts direct current (DC) to alternating current (AC). It is an inverter used in solar photovoltaic systems and is an important component in photovoltaic systems. So how do you choose the right PV inverter? Soliswatt talks about the principles and types of photovoltaic inverters today.

First, the working principle and characteristics of photovoltaic inverter

Working principle: The core of the inverter device is the inverter switching circuit, which is simply referred to as the inverter circuit. The circuit completes the function of the inverter by turning on and off the power electronic switch.

Features:

1. Requires high efficiency.

Due to the current high price of solar cells, in order to maximize the use of solar cells and improve system efficiency, it is necessary to improve the efficiency of the inverter.

2. Requires high reliability.

At present, the photovoltaic power station system is mainly used in remote areas, and many power stations are unattended and maintained. This requires the inverter to have a reasonable circuit structure, strict component screening, and requires the inverter to have various protection functions, such as: input DC polarity reverse protection, AC output short circuit protection, overheating, overload protection, etc.

3. The input voltage is required to have a wide adaptation range.

Since the terminal voltage of the solar cell varies with the load and the intensity of the sunlight. Especially when the battery ages, the terminal voltage varies widely. For example, for a 12V battery, the terminal voltage may vary between 10V and 16V, which requires the inverter to work normally in a large DC input voltage range. .

Second, the type of photovoltaic inverter

PV inverters should be selected according to the environment. The PV inverters on the market are divided into centralized inverters, string inverters and micro inverters:

1. Centralized inverter, mainly used in large-scale ground power stations, with a voltage rating of 315V, suitable for high-voltage grid connection;

2. String inverters, also known as distributed inverters, are mainly used in all kinds of barren hills, industrial and commercial or family roofs. The scale of power plants is generally small, and they are integrated into the national grid through full-time Internet access or surplus power access;

3, micro inverter, mainly used in direct integration on the battery board, suitable for small family power stations.

Third, how to choose the PV inverter.

Power

In the selection of PV inverter power, we need to match the maximum power according to the requirements of the system. In general, if the rated output power of the PV inverter is close to the input total power, it can be largely Save a certain cost.

2. Technical indicators

In addition, we also need to select the appropriate input and output voltage range to ensure the optimal combination of PV inverters. It should be noted that the selected PV inverter should have basic protection functions. As the core equipment of photovoltaic power plants, it should also have relevant safety certification.

3. Brand and service

Finally, it is also very important to recommend that you buy a better brand of products, because a company with a good brand usually has a large investment in technology and maintenance services to meet its commitment to customers. In addition, its services will be better than others.

The above is about the introduction of how to select the PV inverter. I hope that after reading it, you can have a deeper understanding and understanding. With the deepening of solar power generation applications in the future, the application range of PV inverters will continue to expand. Therefore, if you have related needs, I believe Soliswatt will be a good choice.