MID (Measuring Instruments Directive, Directive 2014/32/EU) is a mandatory EU regulation for measuring instruments used in water, electricity, gas, heat, and other utility metering applications.

Its core purpose is to ensure that measurement results used for trade settlement are accurate, fair, and tamper-proof.

Although an MID-certified energy meter serves as the "metrological heart" of the charging pile, the final charging energy (kWh) is generated by the entire charging pile system.

When assessing compliance, EU Notified Bodies (such as TÜV and SGS) take a system-level perspective and examine the following aspects — which cannot be fully covered by a standalone meter alone:

1. Integrity of the measurement loop

Certification bodies must verify the end-to-end accuracy of the entire chain: from the charging gun output, through the energy meter sampling, to the main control chip's calculation and the display on the screen. Even if the meter itself is accurate, issues such as poor contact in the voltage/current sampling cables inside the pile, data processing errors on the main control board, or unauthorized tampering with the displayed values can all lead to measurement inaccuracies.

2. Immunity to interference and tamper resistance

MID certification does not only require static accuracy — it also demands reliability under dynamic conditions. The interior of a charging pile is a complex electromagnetic environment, with high-power relay switching and contactor engagement generating strong electromagnetic interference. MID certification must verify that the energy meter can maintain stable measurement under such harsh conditions. Additionally, the regulation requires the entire machine to incorporate tamper-proof design (e.g., lead seals) to prevent external manipulation (such as strong magnetic fields or physical disassembly) from affecting measurement results.

3. Software compliance and algorithm security

The metering algorithms of modern charging piles are deeply integrated with software. MID requires that measurement-related software be "controlled" — any software changes that affect metering (such as firmware updates) must be re-notified and retested. Without full-machine certification, it is impossible to prove that the metering software works securely and synergistically with the certified meter's software.

Clear Definition in EU Regulations: Charging Piles Are Now Explicitly Covered

On November 18, 2025, the Council of the EU and the European Parliament reached a provisional agreement to update the Measuring Instruments Directive (MID).

The core change of this agreement is to formally include all Electric Vehicle Supply Equipment (EVSE) — i.e., charging piles — within the mandatory scope of MID certification.

In the past, the metering module of a charging pile might have needed to comply with relevant standards, but the entire pile was never explicitly required to undergo statutory metrological certification.

Why Use an MID-Certified Meter? — Simplification, Not Exemption

Since the entire machine still requires certification, what is the value of using an MID-certified energy meter?

The answer is: it significantly simplifies the certification process and reduces costs.

If you use a non-MID-certified meter

If a charging pile manufacturer chooses an ordinary meter without MID certification to apply for whole-machine MID certification, the Notified Body will treat the entire charging pile (including the uncertified meter) as a brand-new measuring instrument and conduct full-scope testing.

This means you would have to start from scratch, completing all rigorous tests — including meter type testing (Module B) — resulting in long lead times, high risks, and substantial costs.

If you use an MID-certified meter

If you use an energy meter that has already passed MID certification (such as those from Reallin Electron), the situation is entirely different:

1. Risk transfer: The meter's metrological performance is already recognized by the Notified Body, so there is no need to repeat testing on the meter's fundamental principles and type design.

2. Simplified process: The focus of whole-machine certification shifts to system integration verification — confirming the compatibility and overall accuracy between the meter and the charging pile's main controller, power module, and display unit. This typically corresponds to Module F (Product Verification) or Module D (Production Quality Assurance) under the conformity assessment modules.

3. Shorter timeline: Manufacturers do not need to independently tackle complex meter circuit design and certification processes. The whole-machine certification cycle can be reduced by 3–6 months, allowing faster access to the European market.

Summary

Answer: Using an MID-certified energy meter in a charging pile does not exempt the whole machine from MID certification obligations.

The relationship can be understood as follows:

An MID-certified energy meter is a verified, reliable "metrological heart." The whole-machine MID certification ensures that this heart can beat properly, safely, and stably within the complex "body" (the charging pile), and that the final displayed "vital signs" (energy readings) are genuine and trustworthy.

For charging pile manufacturers aiming to enter the European market, the wisest strategy is:

Choose a high-quality MID-certified energy meter as the core component, and then complete the whole-machine MID system certification.

This is not only a mandatory requirement for regulatory compliance, but also a competitive advantage that demonstrates product quality and builds trust with European customers.