Installed in partnership with Trakia MT on a solar farm, the system features 90 Sigenergy C&I hybrid inverters combined with the SigenStack modular storage solution. The project demonstrates the scalability of storage technology.
SigenStack replaces bulky containerised systems with stackable 12 kWh battery packs. With plug-and-play connectors and tool-free installation, the system eliminates the need for complex wiring, cranes and heavy machinery.
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Thanks to this design, the entire 20 MWh system was installed in just 10 days and fully commissioned within two days. Galina Peycheva-Miteva, owner of Trakia MT Ltd., noted: “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.”
Safety engineered at the pack level.
Each 12 kWh battery pack features six layers of protection, including temperature sensors, internal fire suppression units, aerogel insulation, decompression valves, high-temperature-resistant insulation pads and smoke detectors. This configuration enables early detection of thermal runaway at pack level and initiates a rapid, localised response within seconds.
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The inverter platform includes ultra-fast 500 ms anti-backflow protection and long-range arc fault circuit interrupter (AFCI) technology, capable of detecting faults up to 500 metres away.
Sigenergy
To further validate its safety performance, Sigenergy partnered with the global assurance provider Intertek to publish a C&I Safety White Paper. The results confirm full compliance with UL 9540A and IEC 62619, structural stability under extreme conditions and sustained operational efficiency above 95%.
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Other notable features include an IP66 rating for dust and water resistance, as well as real-time monitoring via a cloud-based platform, which significantly reduces the need for on-site inspections. Maintenance is also streamlined: faulty battery packs can be replaced individually within two hours, without the need for full system diagnostics or on-site technician intervention. This reduces downtime, simplifies spare parts logistics and minimises operational costs. (hcn)
