The appearance of the three-phase four-wire watt-hour meter adopts the Din rail type, which reduces the overall space in volume and is convenient for installation in the charging station. The meter metering mode can be set through RS485 communication, absolute value measurement, algebra and metering, only counting forward, forward and reverse measurement can be set through communication, suitable for various scenarios of applications; If solar power generation is involved, it can be immediately set to algebraic and bidirectional metering modes.