Sigenergy recently hosted nearly 300 energy professionals from around the world in Burgas to discuss the future of commercial and industrial (C&I) energy storage. A key part of the event was a tour of a notable 20 MWh energy storage project in Malko Tarnovo, which uses Sigenergy’s modular C&I battery energy storage system (BESS). This project showcases how scalable and effective the next generation of storage technology can be. The system, developed in partnership with Trakia MT Ltd., a leading Bulgarian solar company, is installed at a solar farm and includes 90 Sigenergy C&I hybrid inverters along with the SigenStack modular storage solution.
SigenStack offers a new modular design for C&I energy storage by replacing traditional bulky container systems with stackable 12 kWh battery packs. These packs use plug-and-play connectors and can be installed without tools, cranes, or heavy equipment. This design allowed the entire 20 MWh system to be installed in just 10 days and fully commissioned within 2 days. Safety is a central feature of Sigenergy’s C&I BESS. The SigenStack battery packs include six layers of protection such as temperature sensors, internal fire suppression, aerogel insulation, decompression valves, heat-resistant insulation pads, and smoke detectors.
This allows early detection of thermal issues and a fast, localized response within seconds, reducing fire risks. Unlike traditional cabinet-style systems, which often lack such compartmentalization and take longer to react, SigenStack isolates problems at the module level to improve reliability and safety. The system’s inverter platform includes advanced features like ultra-fast 500 millisecond anti-backflow protection and long-range arc fault detection up to 500 meters.
To confirm safety and performance, Sigenergy partnered with global testing firm Intertek to publish a Safety White Paper. The results showed full compliance with industry standards UL 9540A and IEC 62619, structural strength under extreme tests, and operational efficiency above 95%. Sigenergy’s design also supports autonomous 24/7 operation and is rated IP66 for dust and water resistance, making it reliable in various environments. In comparison, traditional cabinet systems often require monthly inspections, semi-annual part replacements, and yearly maintenance.
Tony Xu, Founder and CEO of Sigenergy, stated, “Sigenergy’s mission is to accelerate the global transition to clean energy with innovative and scalable storage solutions. This project exemplifies how advanced battery systems can drive business growth and decarbonization across industries.”
Galina Peycheva-Miteva, Owner of Trakia MT Ltd., mentioned, “The installation was incredibly smooth—more like assembling building blocks than deploying industrial infrastructure. This modular design is a game-changer for the C&I energy storage sector.”
A cloud-based monitoring platform offers real-time visibility of system status, energy flow, and alerts, reducing the need for frequent on-site checks. Maintenance is simplified because faulty battery packs can be swapped out individually within two hours, without full system diagnostics or technician visits, lowering downtime and operational costs. The success of the Malko Tarnovo project highlights Sigenergy’s strengths in fast installation, safety, reliability, and smart management. Moving forward, Sigenergy plans to expand globally and promote safer, more efficient, and sustainable energy storage solutions.
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