Summary of communication methods of inverter power supply

As the core component of the power station, how should the communication methods be selected and applied in different application scenarios?

Inverter communication mode and application scenarios

2.1 4G communication

Communication method introduction: This method is the most common communication method at present. The inverter comes with a 4G communication module (built-in SIM card) when it is shipped. Each inverter is configured independently. Data can be sent to the inverter through the wireless network and base Transformer platform for remote browsing.
GoodWe 4G module technical parameters

Main parameters: frequency band: 1800MHz, protocol: modbus TCP

Applicable scenarios: areas where inverters are scattered and wiring is inconvenient.

Advantages: long communication distance; simple installation without wiring; support encryption function; support breakpoint resume; support remote upgrade.

Disadvantages: There is a traffic fee (the inverter is free of charge for 5 years. On the Xiaoguyun window APP, you can see the expiry time of the traffic at the "Flow Top-up" on the home page, and you can also recharge yourself, 36 yuan/year); signal Poor area Poor quality of communication; unable to do real-time control.

2.2 WiFi communication

Communication method introduction:

Method 1: Wireless communication can be realized through the WiFi module matched with the inverter, and the inverter data can be uploaded to the monitoring platform through the wireless network by using the IEEE protocol;

Method 2: Communicate through the WiFi communication module that comes with the inverter itself, and can act as a relay for each other. This unit can be used as a transmitting source and a receiving station, and the final root node is connected to the router to output communication. Signal, the transmission rate is about 20M/s, when the original path is disconnected, the nearby nodes can be used for data transmission.

GoodWe WiFi module technical parameters

Main parameters: communication distance: 10m, frequency band: 2.412GHz-2.484GHz, protocol: modbus TCP

Applicable scenarios: areas with wireless network coverage; you can use the WiFi module + SolarGo APP to debug the inverter; it is suitable for micro-inverter scenarios.

Advantages: simple installation without wiring; no traffic charges; support resumed upload; support remote upgrade, flexible networking, and high communication reliability.

Disadvantages: susceptible to interference; greatly restricted by the environment of the installation site.

2.3 Bluetooth communication

Communication method introduction: The short-distance communication can be realized through the Bluetooth module matched with the inverter, and the LE protocol is used, which is mainly used for on-site debugging of the inverter.

Main parameters: communication distance: 10m, use protocol: modbus RTU

Applicable scenarios: devices that require near-end debugging.

Advantages: easy connection; no traffic charges; fast communication speed; low power consumption.

Disadvantages: short communication distance; unable to access the Internet.

2.4 LAN communication

Communication method introduction: The built-in LAN module of the inverter can be connected to the router through a network cable, and finally the data of the inverter can be uploaded to the monitoring platform through the wireless network.

Main parameters: communication distance: 100m; use protocol: modbus TCP

Applicable scenarios: mainly foreign household scenarios and energy storage equipment.

Advantages: no traffic charges; convenient wiring; stable communication.

Disadvantage: The inverter needs to have a LAN interface.

2.5 RS485 communication

Communication method introduction: RS485 communication adopts the wired connection method, and the inverters are connected hand in hand. The last inverter is connected to the data collector through the link, and then the inverter data is transmitted to the monitoring platform through the wireless network.

Main parameters: communication distance: 1200m; transmission rate: 9600bps/s; protocol: modbus RTU

Application scenarios: Large project capacity, large number of inverters and relatively centralized; special application scenarios that require participation in control, such as power control, anti-backflow, etc.

Advantages: stable communication, strong anti-interference ability; control function can be realized; friendly communication with third parties.

Disadvantages: need to use data collector; need wiring; communication distance 1200m.

2.6 PLC communication

Communication method introduction: Power line carrier communication is adopted, and the existing power line is used as the transmission medium to realize data transmission and information exchange. When using the power line communication method to send data, the transmitter first modulates the data onto a high-frequency carrier, then couples it to the power line through a coupling circuit after power amplification, and finally restores identifiable data through modulation and demodulation.

SCB3000 technical parameters

Main parameters: communication distance: 1000m; transmission rate: 100kbps/s frequency band: broadband 0.7-2.9MHz; protocol: modbus RTU

Applicable scenarios: scenarios with large project capacity, a large number of inverters, and the use of step-up or low voltage without load.

Advantages: no additional communication lines are required; the communication is stable.

Disadvantages: Cannot be used with load; need to add modem equipment; communication distance 2000m.

The above is a summary of various communication methods of the inverter. The most suitable communication method can be selected according to different application scenarios and demand points. Under various communication and control methods, an energy interconnection platform can be built to improve the balance ability of the power system and support The rapid development and efficient utilization of new energy supports the coordinated control of source, grid, load and storage, and facilitates the construction of a new power system.

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