Understanding MID Meters: Billing for Charging Stations, Compliance, and Selection Guide

Are you wondering: why do I need a MID meter when I just need my home charger to work? Is it just a regular power display? Not quite.

Especially in commercial charging scenarios, an MID meter is far more than a tool for recording numbers—it directly impacts whether you can charge fees legally and accurately settle the cost of every kilowatt-hour.

For personal home use, a standard meter might suffice.

But if your charging station serves tenants, visitors, employees, or is used for public charging, an MID meter is a legally required piece of equipment. It ensures your billing is lawful, your data is accurate, and helps you avoid unnecessary risks.

In this article, we will walk you through what an MID meter is, how it differs from a regular meter, the scenarios where it is mandatory, and how to choose the right one based on your charging station type and usage needs.

By the end, you will have a clear understanding of whether you need an MID meter and how to select the best one for your own situation.

What is an MID Meter?

You may have heard of an MID meter, but what exactly is it? In fact, MID isn’t a brand of meter—it’s a legal certification standard that the meter must meet.

What Does MID Mean? Why Is It Called an MID Meter?

MID stands for Measuring Instruments Directive, a regulation issued by the European Union (Directive 2014/32/EU).

This directive governs metering devices used in commercial transactions, such as water meters, electricity meters, and gas meters, ensuring their measurements are accurate, reliable, and traceable.

In simple terms, an MID meter is an electricity meter that has passed EU MID certification. Only certified meters can be legally used in the EU market for commercial purposes like electricity billing and energy settlement.

Here’s a straightforward way to understand it:

• Standard Meter: Measures data, suitable for personal use.
• MID Meter: Provides legally recognized measurements, ensuring compliant billing.

How Does an MID Meter Differ from a Standard Meter?

You may wonder, “Isn’t a meter just for measuring electricity? Why spend more on an MID-certified one?”

The differences are significant, especially in commercial settings:

If you’re just charging your own vehicle at home, a standard meter is enough. However, for public places or charging others, an MID meter is mandatory—otherwise, your billing is invalid and could even be illegal.

Key Functions of an MID Meter

So, what practical value does an MID meter offer? It’s not just about a certification label—it’s a legal safeguard for your operations and billing:

Legal Billing

The electricity usage recorded by an MID meter can be directly used to issue bills and collect fees, compliant with regulations in Europe and other regions.

Without it, your billing may not be legally recognized, potentially leading to fines or rectification orders.

Accurate Measurement

MID meters are certified for high precision by EU authorities, ensuring every kilowatt-hour is accurately recorded. This is critical during long-term or variable-power charging, maintaining low error rates.

This ensures fairness and transparency for both customers paying and businesses collecting fees.

Commercial Compliance

In markets like the EU and UK, using a non-MID meter for billing in commercial charging stations or rental properties is considered illegal metering, carrying legal risks. Only an MID meter ensures compliance, protecting your operations from regulatory issues.

Think of an MID meter as the “legal billing device” for your charging station. It’s not just about measuring data—it’s a critical component for ensuring compliant, secure, and lawful operations.

Is an MID Meter Mandatory?

When choosing a charging station, many people ask: “Do all meters need to be MID-certified?” The answer depends on whether you’re using it for personal or commercial purposes. Let’s break it down simply:

Home Use: Not Mandatory, a Standard Meter is Enough

If you’re charging your own car at home and not billing anyone, an MID meter isn’t required.

A standard meter or the basic metering module built into the charging station is perfectly sufficient.

Since you’re only tracking your own usage and not settling accounts with others, you don’t need legally recognized measurements.

Commercial/Billing Scenarios: MID Meter is Mandatory

You must use an MID meter in the following cases:

• Public parking lots, malls, gas stations, etc., charging fees to public vehicles.
• Companies, rental properties, or community parking spaces charging tenants or visitors by usage.
• Businesses allocate electricity costs internally to employees or departments (involving financial settlements).

In the EU, UK, and other regulated regions, this is a legal requirement. Without an MID meter, any fees you collect are considered “legally baseless” and could be deemed illegal metering.

Can an MID Meter Be Used for Billing or Reimbursement?

Yes, an MID meter is specifically designed for legal billing. Its readings can be used directly as:

• The basis for charging vehicle owners at commercial charging stations.
• Internal business accounting or employee reimbursement for electricity costs.
• The basis for property managers to charge tenants for energy fees.

However, whether the readings qualify for reimbursement depends on:

• Whether your company’s financial processes accept MID meter readings as valid proof.
• Whether formal invoices are issued (in Europe, many charging management systems generate invoices based on MID meter data).

In short, an MID meter provides legally recognized proof for billing, invoicing, and reimbursement, while a standard meter is only for personal reference and cannot serve as a legal billing basis.

Is It Illegal to Charge Fees Without an MID Meter?

In strictly regulated regions like the EU and UK, yes, charging based on a non-MID meter is illegal. Here’s why:

• Your meter hasn’t been tested by an authorized body, so it lacks billing legitimacy.
• If a customer disputes the accuracy of your charges, you have no legal evidence to back them up.
• Regulatory inspections could result in fines, orders to rectify, or, in severe cases, revocation of your operating license.

If you’re running a commercial charging operation, an MID meter is not a “recommended option”—it’s a must-have for compliance.

Functions and Performance of MID Meters

You might think, “Isn’t a meter just for recording electricity usage?” So why do MID meters require certification, support remote communication, and come with a higher price tag?

The true value of an MID meter lies not only in its ability to measure but also in its precision, connectivity, and management capabilities. Let’s break it down step by step:

1. Can an MID Meter Accurately Record Electric Vehicle Charging Usage?

Absolutely. MID meters are among the most precise meters available for commercial charging stations.

They typically meet Class 1 or Class B accuracy standards, with an error margin of ±1% or less. Even during long-term operation, load fluctuations, or intermittent charging, MID meters consistently deliver accurate energy data.

For example: If you charge a customer for 10 kWh, a standard meter might have an error of ±0.3–0.5 kWh, but an MID meter keeps errors within ±0.1 kWh. For long-term operators, this precision ensures fairness, trust, and financial control.

2. What Are the Accuracy Standards for MID Meters?

Most MID meters comply with one of these standards:

• Class B (EU standard): Suitable for residential and commercial electricity scenarios.
• Class 1 (IEC standard): Error ≤ ±1%, a universal high standard for energy metering.

Whether for single-phase or three-phase systems, or for 7kW or 22kW charging stations, this level of accuracy meets most operational needs.

3. Can MID Meters Connect to a Backend System or App for Data Reading?

Yes, they can.

Most modern MID meters support wired or wireless communication interfaces, allowing real-time synchronization of energy data to a backend management platform or mobile app.

You can remotely monitor each charging station’s energy usage, voltage, current, and power changes without needing to manually check meters on-site. Data is automatically stored, exported, and used for billing.

Common communication methods include:

• RS485 / Modbus RTU (most common)
• Modbus TCP / Ethernet
• OCPP platform integration (via charging station systems)
• 4G/Wi-Fi modules (optional on some models)

If you are already using a charging management platform, MID meter data can be integrated for unified management.

4. Do MID Meters Support Remote Monitoring or Data Export?

Yes, they do.

With proper configuration, MID meters enable:

• Real-time remote energy readings
• Daily/monthly usage reports
• Alerts for anomalies (e.g., voltage irregularities or power loss)
• Remote time synchronization and data updates
• Automatic billing generation when integrated with a platform

This is especially valuable for operators managing multiple charging stations across different locations.

You can monitor all devices from your office or phone, eliminating the need for manual inspections.

5. Are MID Meters Compatible with Three-Phase Systems?

Yes, many MID meter models support three-phase three-wire or three-phase four-wire systems, suitable for 11kW, 22kW, or higher-power charging stations. These stations are commonly used in malls, construction sites, or community parking areas.

For home use with single-phase 230V systems, you can choose a single-phase MID meter.

When selecting a model, consider:

• The meter’s specified voltage and wiring configuration (L1/L2/L3/N)
• Whether your distribution box has enough space (DIN rail mounting is most common)
• Whether the meter’s current range covers your charging station’s rated power

In summary, if you need these features:

• Accurate recording of every charging session
• Remote monitoring, automated billing, and backend integration
• Compatibility with high-power three-phase charging stations
• Legal compliance in markets like the EU and UK

Then an MID meter is indispensable. It’s not just a meter—it’s a critical tool for commercial management.

Regulations and Compliance Requirements

If you plan to operate commercial charging stations or bill publicly in EU countries, the UK, or similar regions, whether you use an MID meter or not directly determines the legality of your charges.

Do MID Meters Meet European Metering Standards?

Yes, MID meters are certified under the EU Measuring Instruments Directive (MID) 2014/32/EU. Their accuracy, stability, and tamper-proof capabilities are tested and certified by EU-authorized bodies such as TUV, SGS, or CEOC.

Certified MID meters carry clear markings:

• MID logo
• Certification year (e.g., M22 for 2022)
• Certification body code

This ensures the meter is legally valid for statutory metering and billing in the European market.

Is an MID Meter Mandatory for Commercial Charging Stations in Europe?

Yes, it’s generally mandatory for any commercial billing scenario.

This applies to:

• Public parking lots
• Malls and supermarkets
• Corporate campuses charging employees or visitors
• Residential complexes, rental properties, or hotel parking spaces
• Public roadside charging stations

Even charging friends for electricity usage technically falls under “external billing” and requires a legally certified meter.

Without an MID meter, you risk customer complaints or regulatory inspections deeming your charges non-compliant, leading to legal consequences.

For personal home use without billing, an MID meter is not mandatory.

Is MID Certification a Legal Requirement? In Which Countries Is It Mandatory?

The following regions explicitly require commercial metering devices to have MID certification or equivalent standards:

In Europe, MID certification is mandatory: without it, commercial billing is illegal.

In parts of Asia and the Americas, while MID certification isn’t required, equivalent local certifications are necessary for commercial devices—standard meters cannot be used for billing.

In a word, for commercial charging in the EU, UK, Switzerland, and Norway, an MID meter is a legal requirement.

In other countries, local equivalent certifications apply, but the principle remains: commercial operations require legally recognized metering.

For home use without billing, there’s no mandatory requirement, though choosing an MID meter can be future-proof for potential commercial upgrades.

Installation and Compatibility

Once you decide to use an MID meter, a question arises: Is it built into the charging station, or does it require separate installation? Is the installation complex?

The answer depends on the charging station model and your specific needs.

Do Charging Stations Come with Built-In MID Meters?

Many charging station models, especially commercial ones designed for the European market, come with a built-in MID-certified meter.

This is the simplest option, as you can install and use the charging station like any standard unit without additional wiring or meter purchases.

Advantages of charging stations with built-in MID meters:

• Saves installation time and labor costs
• Sleek design, no extra space required
• Pre-tested at the factory for high reliability
• Data syncs directly to the charging station’s management system or app without additional setup

Things to note:

• Charging stations with built-in MID meters are slightly more expensive.
• If the meter needs replacement later, you may need to replace the entire station, reducing flexibility.

Can MID Meters Be Externally Connected? Is Additional Configuration Required?

Yes, external MID meters are supported. For scenarios where a built-in meter isn’t practical or if you prefer centralized management in a distribution box or building, you can opt for an external MID meter.

Key considerations for external setups:

Additional Wiring:

• The power line must go through the MID meter before connecting to the charging station.
• A communication line (e.g., RS485/Modbus) is needed to transmit meter data to the charging station or backend system.

Configuration:

• You’ll need to set the meter’s communication parameters, such as address, protocol type, and baud rate, to ensure proper data reading.

Benefits of external MID meters:

• Flexible installation, allowing placement in a convenient, maintenance-friendly location.
• Easy to replace or upgrade the meter without affecting the charging station.
• Multiple charging stations can share a single MID meter for centralized metering.

Do MID Meters Require Separate Wiring or Configuration?

It depends on the setup:

• Built-in MID Meters: No separate wiring is needed. The meter is pre-configured at the factory, and you only need to connect the main power to the charging station. The system automatically reads the energy data.
• External MID Meters: Require wiring from the main power source → MID meter → charging station. You’ll also need to configure communication parameters to ensure the charging station or backend system can read the meter’s data accurately.

Recommendations:

• For home use with a single charging station: Choose a model with a built-in MID meter for simplicity and convenience.
• For commercial setups with multiple or distributed charging stations: Opt for external MID meters for centralized management and easier maintenance.

By selecting the right setup based on your needs, you can ensure a smooth and compliant installation process.

Do You Need an MID Meter for Home Use?

If you are only charging your own electric vehicle at home and not billing anyone, you don’t need an MID meter.

A standard meter or the basic energy tracking function built into your charging station is sufficient to monitor your charging usage.

Why?

• Legally, private household electricity use doesn’t require an MID meter.
• Since you’re not charging others, there’s no need for legally compliant metering.

For most home users, a standard charging station with basic metering is cost-effective and avoids installation complexity.

When Might Home Users Consider an MID Meter?

While not mandatory, there are specific scenarios where choosing an MID meter for home use makes sense:

1. Planning to Charge Others in the Future: If you might open your parking space to neighbors, visitors, or tenants and charge for usage, an MID meter ensures compliance with regulations from the start, saving you the hassle of retrofitting later.
2. Multiple Vehicles or Shared Use: If your household has 2 or 3 electric vehicles and you want to track each car’s usage separately for internal cost allocation, an MID meter provides accurate data. While not legally required, it simplifies management.
3. Remote Monitoring or Smart Home Integration: Some MID meters support remote data reading and can integrate with home energy management systems (e.g., Home Assistant or smart metering platforms). This lets you monitor charging energy, power, and estimated costs remotely, enhancing your smart home experience.
4. High Accuracy Needs: If you want highly precise energy consumption records, MID meters offer better accuracy and long-term stability compared to standard meters, which may have larger errors.

If you’re unsure which option is best, feel free to contact us with details about your situation. We can advise whether an MID meter is worth it or if a standard meter is more suitable for you.

How to Choose the Right MID Meter?

Choosing an MID meter can feel overwhelming with the variety of models and price ranges available. However, by focusing on a few key factors, you can easily select the right one for your needs.

1. How to Choose an MID Meter Based on Power, Grid, and Communication Needs

Based on Your Grid Type

• For a 7kW Single-Phase Home Charging Station: Choose a single-phase MID meter, 230V, with a maximum current of ≥40A.
• For an 11kW/22kW Three-Phase Commercial Charging Station: Choose a three-phase MID meter, 400V, with a maximum current of ≥63A.

Based on Remote Reading Needs

• On-Site Viewing Only: A basic model is suitable and more affordable.
• Integration with a Charging Management Backend: Select a model with RS485/Modbus or Ethernet TCP support.
• Smart Platform Integration (e.g., OCPP Backend): Ensure the meter supports compatible protocol integration.

Based on Installation Method

• Distribution Box: Opt for a DIN rail-mounted meter for easy installation.
• Standalone Installation: Choose a wall-mounted or enclosed model.

Based on Accuracy Requirements

• Commercial Use: Choose Class B or Class 1 accuracy to meet MID certification standards.
• Home Use: Standard accuracy is sufficient; high precision isn’t necessary.

2. Recommended Brands and Models

Here are some reliable, commonly used brands and models for reference:

When selecting a specific model, confirm it matches your charging station’s power, current, and installation space.

3. Are MID Meters Much More Expensive Than Standard Meters? Are They Worth It?

Approximate price ranges for meters:

• Standard Single-Phase Meter: $10–$30
• MID Single-Phase Meter: $40–$80
• Standard Three-Phase Meter: $30–$60
• MID Three-Phase Meter: $80–$150

Why Are MID Meters More Expensive?

• They undergo EU MID certification, which increases costs.
• They offer higher accuracy and stricter quality standards.
• They include advanced features like remote communication and data protection.

Are They Worth It?

• For Home Use: A standard meter is usually sufficient, and the extra cost of an MID meter may not be justified.
• For Commercial Use: We strongly recommend an MID meter. Non-compliance with regulations could lead to greater risks, such as fines or operational issues.

Final Thoughts

Whether for home or commercial use, choosing an MID meter is about peace of mind in managing your energy data.

• For home scenarios, keep it simple and avoid over-investing.
• For commercial operations involving billing, an MID meter is not just a legal requirement—it’s a critical step to ensure your business is compliant and builds customer trust.

Selecting the right equipment upfront saves headaches and ensures compliance in the long run.