Industry Secrets:new energy vehiclecharging pileWhat to useelectricity meter？

Introduction:

At present, the number of new energy vehicle charging stations in China is close to 14 million, including about 4 million public charging facilities and nearly 10 million private charging stations.

In today's booming electric vehicle industry, charging piles, as a crucial supporting infrastructure, are becoming increasingly numerous and their application scenarios are becoming more diverse. Whether it is the public charging stations that can be seen everywhere on the streets and alleys of the city, or the private charging piles that provide intimate services for residents in residential areas, they are all safeguarding the convenient use of electric vehicles and becoming a solid support behind the popularization of electric vehicles.

In the daily operation of charging stations, the importance of the energy meter as the core measuring device cannot be overemphasized. It not only directly affects the accuracy of charging station billing and is closely related to the vital interests of users, but also plays a crucial role in the efficient operation and management of charging stations and the stable and reliable operation of the power grid. So, what kind of energy meter is used for electric vehicle charging stations? Next, let's unveil the mysterious veil of this industry together.

1 AC charging station energy meter

1.1 Types of Electric Meters

AC single-phase energy meter:Suitable for charging electric vehicles in homes, small shops, and other places. In these scenarios, the charging power demand is relatively small, and AC single-phase energy meters can meet basic metering needs. Its power measurement range is usually between 5-100A, below 230V, and the accuracy meets the MID standard. It can provide relatively accurate electricity measurement for household or small commercial users.

AC three-phase energy meter:Suitable for commercial charging stations, large parking lots, public charging facilities, and other places that require high-power charging piles. These places often require charging multiple electric vehicles simultaneously, and the charging power is relatively high. AC three-phase energy meters can measure high power, such as 60A to 100A or higher, suitable for three-phase power networks, with an accuracy of usually 0.5 or 1 level, and can meet the accurate measurement requirements in large-scale charging scenarios.

1.2 Characteristics of Electric Meter

An alternating current meter is similar to the one used in households, both measuring alternating current. Its working principle and measurement method are relatively mature, and its technology is relatively stable.

AC charging stations are generally compact in size, so the main type of AC energy meter for charging stations is the rail type energy meter with a relatively small size. This design is easy to install and maintain, can save space, and adapts to the compact structural characteristics of AC charging piles.

II DC charging station electric meter

2.1 Types of Electric Meters

Embedded DC energy meter:It requires an external shunt or Hall sensor for current sampling, and a hole needs to be opened inside the cabinet.

Wall mounted DC energy meter:Early charging stations were commonly used, with an appearance similar to a regular household electricity meter, but requiring an external shunt for current sampling. It has a large volume and occupies the internal space of the charging station.

Rail mounted DC energy meter:Improved on the basis of wall mounted, it has a compact size, supports standard DIN rail installation, and is compatible with compact charging stations.OptionalSupport dual channel meteringAnd dual 485 communicationSuitable for dual gun charging stations.

Integrated DC energy meter:Built in splitter, achieving overall sealing and high measurement accuracy，Strong anti-interference ability. It is compact in size, easy to install, supports multi protocol communication, and has significant comprehensive cost-effectiveness. The integrated DC energy meter has been widely used on DC charging stations and has become an ideal choice for charging station manufacturers.

2.2 Characteristics of Electric Meter

The DC energy meter is specifically used to measure DC electricity and is a key measuring device for DC charging stations. Unlike alternating current meters, direct current meters need to be designed and optimized based on the characteristics of direct current to ensure measurement accuracy and stability.

DC energy meters can accurately measure the power consumption during the charging process, providing important data support for the operation and management of charging stations, user billing, and stable operation of the power grid. Through precise electricity metering, reasonable billing can be achieved to protect the rights and interests of users; At the same time, it also provides accurate operational data for charging station operators, facilitating cost control and benefit analysis.

With the development of technology, DC energy meters are constantly moving towards high precision, intelligence, and multifunctionality. For example, an integrated DC energy meter with a built-in shunt has the characteristics of high measurement accuracy, compact size, easy wiring, and strong communication compatibility, which can better meet the needs of modern DC charging stations.

III Common certification requirements

Chinese Type Approval (CPA) certification for measuring instruments:In China, the electric energy meter accompanying the charging station needs to be certified by CPA to ensure that the measurement accuracy meets national standards. This is the basic requirement for charging station meters to enter the Chinese market.

EU Measurement Instrument Directive (MID) certification:In the EU market, energy meters must comply with the MID directive to ensure measurement accuracy and compliance. MID certification is a key threshold for entering the European market, suitable for electricity meters that require high-precision measurement.

UL Standard Certification in the United States:In the US market, electric energy meters need to be certified according to UL 2735 standards to verify their safety and measurement accuracy. UL certification is highly recognized in the North American market and is one of the important certifications for entering this market.

European CE certification:Covering electromagnetic compatibility (EMC) and low voltage directive (LVD), it is a mandatory certification for entering the European market. Charging station meters need to pass CE certification to ensure compliance with EU safety and electromagnetic compatibility requirements.

RoHS certification:Restrict the use of harmful substances and apply to all electronic and electrical equipment. Charging station meters must comply with RoHS certification requirements to ensure minimal environmental impact during production, use, and disposal.

4 Key selection points summarized

Type of electric energy meter:Choose the appropriate type of energy meter based on whether the charging station is AC or DC. Different types of charging stations have different requirements for energy meters. Only by selecting a matching energy meter can the accuracy and stability of the measurement be ensured.

Certification requirements:Provide corresponding certification certificates based on the different scenarios and regions of electricity meter usage to assist charging stations in completing complete machine certification.

Rated power and current:Select a suitable energy meter based on the rated power of the charging station to ensure that the meter can withstand peak loads. If the rated power and current of the energy meter are too low, it may lead to inaccurate measurement and even damage to the energy meter.

Accuracy requirements:The accuracy requirements for electric energy meters vary in different application scenarios, and commercial charging environments typically require higher accuracy. In commercial charging stations and other places, accurate electricity metering is directly related to users' expenses and operators' profits, so it is necessary to choose high-precision energy meters.

Communication function:Modern energy meters support multiple communication protocols, and selecting the appropriate data transmission method can achieve remote monitoring and management. Through remote monitoring and management, operators can real-time understand the operation status and power consumption of charging stations, timely discover and solve problems, and improve operational efficiency.

Protection levelEspecially for charging stations used outdoors or in public places, attention should be paid to the protection level of the energy meter to ensure its reliability in various environments. The outdoor environment is complex and ever-changing, and may be affected by factors such as rain, dust, and high temperatures. Therefore, it is necessary to choose an electric energy meter with a higher level of protection to ensure its normal operation.

Installation and maintenance:Choose an energy meter that is easy to install and maintain in the future to reduce operating costs and maintenance time. An electric energy meter that is easy to install and maintain can reduce the labor and time costs of operators, and improve the overall operational efficiency of charging stations.

Conclusion:

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