TESVOLT battery storage systems are among the safest in Europe

New certificate confirms electrical and functional safety +++ TESVOLT demands stricter safety tests for battery storage systems

Lutherstadt Wittenberg, 20 November 2023 – TÜV Rheinland has also taken a close look at the latest battery storage system generation from TESVOLT. The high-voltage storage systems TS HV 30 E, TS HV 50 E and TS HV 80 E passed the safety tests. TESVOLT is one of the few manufacturers on the market that can verify the safety of its energy storage systems for commerce and industry with certification from the independent testing institute. The IEC 62619 certification confirms both the electrical and functional safety of TESVOLT’s products, which are available throughout Europe.

Catch-up work is required in the storage system industry

“Unfortunately, product safety testing is not yet a matter of course within the storage system industry. Numerous manufacturers economise with regard to certificates and more comprehensive safety testing,” reports Roman Brück, Head of the Components, Power Electronics and Certification Department at TÜV Rheinland. “TESVOLT, on the other hand, takes the subject of safety very seriously. We were involved right from the start of development and took a very close look at the new storage system series – in other words, in addition to testing functional and electrical safety, we also carried out fire tests, abuse tests and combination tests which check the interaction of the individual components.”

TESVOLT demands safety tests for all manufacturers

“I think that all companies are under pressure to optimise their costs. Globalisation and the current economic situation have certainly played a part in this. With the rapidly increasing number of manufacturers, particularly from China, there are some who unfortunately make cutbacks in areas where it is not immediately noticeable. For example, regarding voluntary certification and testing or in the quality and durability of individual components,” explains Simon Schandert, co-founder and CTO at TESVOLT. “However, safety must always be given top priority.”

TESVOLT, together with other quality manufacturers in bodies such as the German Energy Storage Systems Association (BVES), is thus campaigning for additional certification and testing to be made mandatory for all manufacturers.

Multi-stage safety concept

TESVOLT pursues a multi-stage safety concept. The company carries out partially automated complete cyclic conditioning at its production site in Lutherstadt Wittenberg: Every battery module is fully charged and discharged and tested for any irregularities with regard to temperature, voltage and internal resistance. Finally, fully automated end-of-line inspections ensure maximum safety, with every battery cell tested and less efficient battery modules automatically removed.

All TESVOLT energy storage systems are also designed with multiple in-built safety features. The battery cells are subject to six safety mechanisms. For example, a safety fuse will interrupt the electrical current if the unit experiences a short circuit or overcurrent. In the event of excess pressure, a safety valve on the cell opens in order to ensure that pressure compensation takes place. A sturdy aluminium housing protects every cell from mechanical damage.

TESVOLT’s A and E series battery storage systems are tested in accordance with the international IEC standards: 62619, 62620, 61000, 61010, 61508 and UN38.3. TESVOLT is also certified in accordance with ISO 9001:2015 for successful implementation of quality management throughout the company.

The battery storage systems in the TS HV 30-80 E series are certified for all European countries and are expected to be certified for the UK from the first quarter of 2024.

You can find more information about TESVOLT’s safety concept here .


TESVOLT AG is one of the innovation and market leaders for commercial and industrial energy storage system solutions in Germany and Europe. TESVOLT products enable companies to end their energy dependency and play a part in the energy transition. The agile company produces intelligent lithium storage systems with power ratings from 10 kilowatt hours through to multiple megawatt hours – with top quality and TÜV-certified safety. TESVOLT manufactures its commercial storage system solutions in series production at its own carbon-neutral gigafactory in Lutherstadt Wittenberg and delivers them worldwide. The company has already received several awards, including the German Entrepreneur Award in the “Rising Stars” category, “Innovator of the Year” from TOP 100 and the smarter E Award in the “Outstanding Projects” category.

Press Contact

Ingo Valldorf
Corporate & Financial Communications

Phone: +49 3491 8797-234

E-mail: ingo.valldorf@tesvolt.com

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