Robust solution for automatic backup power supply in three-phase connections, ideal for larger installations and commercial applications.
Instantly switches to the backup port during a power outage, without interruption.
Engineered for long-term use in demanding environments.

Ensures essential systems remain operational during power outages or grid disturbances.
Fully compatible with Marstek batteries and energy systems.
The Marstek Smartbox Three Phase provides reliable and automatic switching to backup power in the event of a grid failure. Specifically designed for three-phase connections, this solution ensures continuity for larger homes, commercial buildings and installations. In combination with Marstek batteries, the Smartbox delivers maximum reliability and a stable backup power supply.
The Smartbox Three Phase switches almost instantly to the backup port during a power outage. This ensures machines, servers and other critical systems remain operational without interruption, which is essential for commercial and larger residential installations.
This Smartbox is specifically developed for three-phase connections and higher power demands. It is the ideal solution for commercial buildings, workshops and homes where a single-phase setup is not sufficient.
Thanks to its robust and scalable design, the Smartbox provides long-term reliability. It is built for intensive use and delivers stable performance even in demanding environments.
For smaller connections or households, the Smartbox Single Phase is available. Combined with the three-phase version, Marstek offers a complete solution for all types of connections, from residential to professional use.
The Smartbox Three Phase is the ideal solution for ensuring continuity in three-phase connections. With automatic switching and robust performance, it reliably protects larger installations and critical systems against power outages.
In addition to its compact design and easy installation, the Smartbox is a valuable addition to any residential energy system. For larger applications or commercial installations, the Smartbox Three Phase is available, offering the same reliable functionality for three-phase connections.
Who is it for


As an importer and specialist in energy storage, we provide not only reliable products, but also the service and expertise to support you. With MW Energie, you choose quality, continuity, and a partner who thinks along with you.
Fully compatible with Marstek ESS and batteries
Automatic switching to the backup port
Supports backup power across all phases
For homes with three-phase connections and commercial applications
Keeps essential systems continuously operational
Suitable for production environments, workshops and offices
Designed for integration in professional installations
Robust and scalable for long-term use
Directly compatible with Marstek batteries and accessories
40+ years of experience in energy solutions
We only supply products from brands that have proven their quality. Always with a clear manufacturer’s warranty, so you can invest with confidence.
Whether you are a dealer or an end user, our support team is ready to assist with advice, installation questions, and solutions. Fast, knowledgeable, and personal.
We keep our products in stock ourselves. This allows us to deliver quickly, so you are never dependent on long lead times or uncertain availability.
Our work doesn’t stop after delivery. We remain involved for maintenance, updates, and guidance, ensuring that you and your customers can rely on ongoing support.