After typhoons and thunderstorms, which port of the charging station control board is the easiest to hang up first when going offline in bulk?

Batch offline, first check the communication port. The main control board is usually equipped with RJ45 Ethernet ports, followed by RS485/CAN transceivers.

Why is it an internet port

• The network cable is long and there are many outdoor cables. When lightning strikes, the induced surge couples in through the network cable, directly damaging the network transformer or PHY chip.

• When the network interface breaks down, the main control board loses contact with the platform, which is manifested as batch offline.

Why isn't it an input port for communication

• The communication input is indeed the main entrance for lightning surge, but it usually has front-end protection of the power board, varistors TVS、 The fuse will be carried first.

• The DC input port on the main control board is usually not on-site.

• Unless the previous protection fails and the surge penetrates to the DC side, it will damage the power supply of the main control board.

Other ports that are prone to hanging up first

• RS485/CAN: Connecting to the electricity meter and backend, detecting lightning over long lines, and easily damaging the transceiver.

• CP/PP: Connecting vehicles, short wires but may introduce surges, damaging signal conditioning circuits.

• 4G antenna port: Outdoor antenna, induction lightning may damage the RF front-end.

• Display screen/buttons: Typhoon flooding can cause a short circuit, but it usually does not directly cause the platform to go offline.

Typical path for batch offline

• Multiple lightning strikes in the same area can simultaneously induce surges from the power grid or network cables.

• The network port or RS485 is broken first, the communication on the main control board is interrupted, and the platform displays batch offline.

• At this time, the main control board may still be running, but it has already "lost contact".

Key points of protection

• Add SPD for communication input, network lightning arrester for network port, TVS for RS485, lightning protection and equipotential for antenna, and waterproof structure.

• After batch offline, prioritize checking the network port and RS485 before checking the power supply.

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