Maximum safety with lithium-ion storage devices

February 2020

Safety aspects for installing home energy storage devices

Voltimum Webinar

In the webinar on December 5, 2019, Junelight experts Lisa Brettner and Andreas Hierl took a comprehensive look at different safety aspects involved in installing an energy storage device in private homes.

Since lithium-ion batteries have the highest energy density, they are ideal energy storage devices – provided that their safety is ensured. The relevant safety aspects include data security, occupational safety, and personal safety. 

Only in german available

Data security

A number of aspects must be taken into account to protect the Junelight user’s data. Steps must be taken to ensure that communication with each system is encrypted. To do this, the Junelight Smart Battery has a secure SSL connection with handshaking between the storage device, the cloud, and the app. However, not only the communication paths but also the content itself must be encrypted. An individual key is used for each system to prevent attacks. A German server with certificates that must be renewed regularly, along with regular hacker and penetration tests, prevent security vulnerabilities.


In addition, a system of roles is in place for different access levels. Access rights are assigned only when necessary on a need-to-know basis. Neither the installer nor the service provider can automatically access a user’s smart battery data. 

Occupational safety 

Occupational safety begins with manufacturing but remains relevant all the way to battery installation and disposal. Every installer should be well trained in the theoretical and practical aspects of system installation, hazardous materials, and disposal. Weight limitations on the individual components makes installing the equipment safer.


The Junelight Smart Battery is therefore supplied in individual components weighing approximately 50 kg, which makes their handling much easier. An included mounting rail and the prewired plug & play solution further minimize installation errors. Siemens provides fast and professional support should critical situations arise despite all safety precautions, including when it comes to the obligation to accept battery returns as well as secure special shipping and a recycling concept. 

Personal safety 

Personal safety should be ensured with software and hardware based on a multi-level protection concept. Within the storage device, this approach guarantees that the control unit can continuously monitor, de-energize, and deactivate the system, including all components. Not only the control unit, but also each individual battery module as well as the converter of the Junelight Smart Battery, can thus activate the DC isolator and set the emergency OFF chain in motion.


As electronic components, home storage devices are subject to various standardization requirements, especially the VDE-AR-N 2510. It is therefore essential that the entire system, including all components, be certified by the German Association for Electrical Electronic & Information Technologies (VDE) as the testing institute. The production process must also be inspected every year to make sure that all devices are tested prior to shipping and a consistently high level of quality is ensured.


Siemens components provide complete external protection outside the storage device. For this purpose, the company offers a comprehensive, harmonized product portfolio for all applications, including miniature circuit-breakers and type B RCD.