The number of electric vehicles on Norwegian roads is growing rapidly, and more and more drivers are charging at fast‑charging stations where payment is made per kilowatt‑hour. It is therefore crucial that the energy measured and billed actually corresponds to what the vehicle receives.

“Measurements are about trust. Manufacturers, suppliers, and owners of fast chargers need to be confident that the energy is measured correctly,” says Lars Holhjem, Subject Matter Expert at Justervesenet. “That way, consumers will also feel confident when charging their electric vehicles.”

From Time‑Consuming Tests to Answers in Minutes

Previously, testing fast‑charging stations was both time‑consuming and inflexible. Many tests were better suited to laboratory environments rather than real conditions at charging sites.

With the new solution, this has changed. Justervesenet now uses a mobile battery simulator that functions like an electric vehicle—except that the energy is converted into heat and the battery never becomes fully charged. Voltage, current, and energy can be controlled, unlike when testing with a real vehicle. Combined with a calibrated reference meter, this provides fast and precise answers as to whether the charging station measures correctly.

“This makes it possible to test charging stations the way they are actually used, not just under ideal conditions. That provides far more reliable results for both owners and users,” says Holhjem.

Benefits for the Entire EV Industry

The service is particularly relevant for manufacturers, owners, operators, and service providers of fast‑charging stations. They receive documented quality, better real‑world performance, and fewer complaints. The tests are also used as documentation for compliance with regulatory requirements. At the same time, EV drivers gain greater confidence that energy measurements are accurate.

Justervesenet acts as an independent and neutral third party, with strong professional expertise and long experience in metrology. The results are presented in reports that can be used internally as well as toward authorities and customers.

Facts About the Test Equipment

Justervesenet uses the reference meter EMOB 500 and the mobile battery simulator MBS 500 to test DC fast‑charging stations. The equipment is connected to the charging station like a regular electric vehicle via a CCS2 connector. The reference meter is calibrated by Justervesenet and measures the current, voltage, and energy delivered from the charging station to the battery simulator.

Preliminary specifications:

• Up to 1000 volts and 500 amperes
• A test at 800 volts and 400 amperes takes less than one minute
• A full test with multiple measurement points can be completed in under ten minutes

Justervesenet offers testing services nationwide and also has the capacity to provide assistance across the Nordic region.

The use of the equipment and additional details about the testing will be demonstrated at the Nordic EV Summit.

For questions and contact information, see here.

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