Teach You How To Choose An Inverter

The inverter is responsible for converting the direct current generated by the photovoltaic module into grid-compatible alternating current. When selecting, the following factors need to be considered:

1. Conversion efficiency

An inverter with high conversion efficiency can reduce the loss in the process of power conversion, usually between 95% and 99%.

2. Stability and reliability

The inverter should be able to operate stably in various environments and have a long service life. The average time between failures should be no less than 10 years, the service life should be no less than 25 years, and the warranty period of the whole machine should be no less than 5 years

3. Intelligent monitoring function

The inverter with intelligent monitoring function can monitor the operating status of the power station in real time, which is convenient for operation and maintenance management. It also has the function of automatically recording and storing fault data, and the storage time is greater than 10 years

4. Safety

The inverter body is required to have a DC input disconnect switch and an emergency shutdown operation switch.

Select Energy Storage Inverter According To Functional Characteristics

1. Protection function:

It has overvoltage protection, overcurrent protection, short circuit protection, island protection and other functions. Overvoltage protection is generally activated when the input voltage exceeds the set value (such as 110% of the rated voltage) to prevent the equipment from being damaged by excessive voltage;

Overcurrent protection is activated when the output current exceeds the rated value (such as 120%) to protect the inverter and load. Short-circuit protection can quickly cut off the circuit when a short circuit occurs at the output end; Island protection prevents the inverter from continuing to supply power to the load when the power grid is disconnected to ensure the safety of personnel and equipment

2. Working mode:

Supports grid-connected mode, off-grid mode and grid-connected and off-grid switching mode. Grid-connected mode: The inverter transmits the power of the energy storage system to the grid or supplies power to the load together with the grid. Off-grid mode: When the grid fails, the inverter supplies power to the load independently; On-grid and off-grid switching mode: It can realize automatic switching between the two modes to ensure the continuity of power supply

3. Communication function:

It has communication interfaces such as RS485, Ethernet, and Wi-Fi, and can interact with monitoring systems or other devices for data. Through the communication function, the operating status of the inverter can be remotely monitored and controlled, and real-time data can be obtained, which is convenient for users to manage and maintain.

Select Energy Storage Inverter According To Power

Calculation method reference

According to the output power demand of the system and the power requirement of the load

1. Determine the peak power of the load.

Generally, the peak power of the load is 1.5-2 times its rated power. For example, if the total load power of a factory is 100kW, then the peak power may be between

150kW-200kW.

2. Consider the output power of the energy storage system.

Generally, the output power of the energy storage system should be slightly larger than the peak power of the load to ensure normal power supply at the peak load. Therefore, the selected inverter power can be around 200kW.

3. Parameter range

Inverter power ranges from a few kilowatts to several megawatts. For small industrial and commercial users, a 10kW-50kW inverter may be selected; medium-sized users can choose a 50kW-200kW inverter; large factories or commercial complexes may require inverters above 200kW