What is a bidirectional electric meter?
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From the perspective of working principle, ordinary electric meters can only measure current in one direction, while bidirectional electric meters have built-in bidirectional measurement chips and intelligent modules. When using electricity at home (such as turning on air conditioning or cooking rice), the current flows from the power grid to the home, and the meter counts in the positive direction; If solar panels are installed at home and there is excess electricity generation on sunny days, the excess current will flow back to the grid in reverse, and the electricity meter will count in reverse. It can accurately distinguish between these two current directions, record data in real time and upload it to the power system to avoid measurement confusion.
The core value of bidirectional electricity meters is most evident in distributed energy scenarios. For example, Mr. Wang in the suburbs of Beijing has installed 10 square meters of solar panels on his roof. During the day at work, if the electricity generated by the solar panels cannot be used up, it flows back to the grid through a two-way meter; During the peak electricity consumption at home in the evening, buy electricity from the power grid. At the monthly settlement, the power company will deduct the "electricity sold back to the grid" from the "electricity used in the grid" and charge the electricity fee based on the difference. Last summer, Mr. Wang's family even experienced a situation where they sold more electricity than they bought. Not only did they not pay their electricity bills, but they also received subsidies from the power grid.
In addition to households, bidirectional meters are also widely used in industrial parks, new energy vehicle charging stations, and other scenarios. For example, a photovoltaic power station in an industrial park generates electricity during the day to supply factories, and excess electricity is sold back to the grid; During the peak electricity consumption in the factory at night, the company supplements electricity from the power grid and achieves "self use and surplus electricity grid connection" through bidirectional electricity meters, which can save hundreds of thousands of yuan in electricity bills for the company annually.
Simply put, bidirectional electricity meters have broken the traditional mode of "one-way power supply in the power grid", transforming ordinary users from "electricity users" to "production use integration". They not only help with energy conservation and emission reduction, but also save costs for users. They are an important "bridge" to promote the popularization of new energy.
