The commercial and industrial (C&I) energy storage market is experiencing rapid growth as industries worldwide focus on decarbonisation and energy efficiency. Key drivers such as declining battery costs, along with policies like the European Union’s Clean Industrial Deal—which prioritises industrial decarbonisation—are accelerating the adoption of battery energy storage systems (BESS).
These factors are fuelling demand for solutions that can efficiently manage peak demand (peak shaving), integrate renewable energy (solar PV self-consumption), and participate in ancillary services markets.
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However, as businesses, warehouses, factories, and industrial facilities seek to meet sustainability goals, they face a range of challenges in adopting energy storage. Traditional C&I energy storage solutions are often large, containerised systems that require complex installations, substantial manual labour, and ongoing maintenance. In high-labour-cost regions like Europe, this can result in significant upfront expenses and operational complexities. Additionally, routine inspections and maintenance can lead to prolonged downtime, further diminishing system efficiency.
This is where Sigenergy’s SigenStack comes in. Designed with a focus on flexibility, safety, and efficiency, SigenStack redefines the approach to C&I energy storage. It is a modular energy storage solution that seamlessly adapts to systems of all sizes, offering unparalleled benefits over traditional systems.
SigenStack’s modular design enables a small footprint, allowing for flexible deployment across various industries. The system integrates a battery-ready hybrid inverter, battery management system (BMS), and up to 252kWh of battery capacity per inverter, with the flexibility to expand in 12kWh increments as energy needs evolve. This modular approach not only simplifies installation and commissioning but also significantly reduces operational and maintenance (O&M) complexities.
“Modularity is the key to unlocking global energy potential,” says Sigenergy founder and CEO Tony Xu. “SigenStack delivers flexibility, safety, and efficiency, empowering industries everywhere to embrace a cleaner, more resilient energy ecosystem.”
Modularity enables a small footprint for flexible deployment. It simplifies installation and commissioning, as well as O&M and enables safety protection at the pack level.
Crucially, SigenStack supports parallel connection of multiple units, which makes it suitable for medium- to large-scale industrial projects. It also means solutions can be fully customised to meet each C&I user’s needs while supporting future expansion.
Innovation and smart design
Its technical characteristics represent a big step forward in innovation and smart design. The DC-coupled architecture, suitable for scenarios including pure solar PV, solar-plus-storage and storage-only applications, minimises energy conversion losses and improves round-trip efficiency (RTE) by 2% while delivering higher energy output.
AC-coupling of solar PV and BESS results in about 89% RTE due to losses at the inverter level (1.5%), combiner (0.1%), battery charging/discharging (6%) and power conversion system (3%).
SigenStack’s innovative DC-coupling minimises energy losses. Purchasing the entire integrated solution from a single provider also reduces Capex by more than €20,000 for a 400 kWac/1,000 kWh PV+ESS project, based on estimates[1]. The system is also compatible with AC-coupled configurations for customers who prefer this setup. Flexible, modular configurations of up to 252 kWh per inverter allow connections to be stacked and completed in under an hour—avoiding the need for specialised forklifts, cranes, and associated labour costs.
It also significantly reduces Opex thanks to its IP66-rated enclosure, active SOC balancing, and pack-level safety protection. Estimated savings can exceed €20,000 annually.
Unlike other storage solutions with fixed cabinet capacities of 100kWh or 200kWh, which can lead to overprovisioning and increased costs, SigenStack offers unparalleled adaptability, from 48kWh to the hundred megawatt-hour range.
The hybrid inverter is available in configurations from 50kW up to 125kW. Even at 125kW, it is the smallest and lightest in the industry, around 19% lighter and 36% smaller than its next-best competitors, further reducing the complexity and costs of installation.
Uniquely, SigenStack also utilises 1250V DC technology, reducing string requirements and improving capacity by over 15% compared to 1100V systems, making it more efficient and cost-effective for large-scale deployments. Its hybrid inverter integrates both inverter and PCS, eliminating the need for extra PCS equipment.
Superior safety at every level
Unlike most C&I systems, which only provide fire suppression per 200kWh of installed capacity, SigenStack integrates fire suppression for every 12kWh battery pack you install. Its six layers of protection comprise fire extinguishers, full-coverage temperature detection, aerogel-insulated pads, smoke sensors, decompression valves, and resistance-insulated pads.
Its superior safety design means thermal runaway is detected 60 seconds faster than in traditional systems. IP66 rating against dust and water jet ingress also means lower maintenance costs and time required.
Meanwhile, should units need to be replaced, the modular design again comes to the fore, reducing downtime and boosting system availability.
‘Redefining energy storage for a global audience’
On the software side, SigenStack leverages Sigenergy’s Cloud Management Platform with artificial intelligence (AI) technology, making it the most suitable BESS for seamless integration with global virtual power plant (VPP) providers and resource aggregators. It supports simultaneous response of up to 2,000 devices, delivering responses in less than one second and updates in 1.5 seconds.
SigenStack’s AI-integrated O&M platform also provides tailored AI solutions for clients, supporting incremental training with new corporate data, addressing enterprise-specific queries and facilitating the integration of AI into business operations.
Meanwhile, the advanced Fully Networked communication (FE communication) technology surpasses the RS485 serial communications standard, with upgrade speeds over 10x faster and anti-backflow speeds under 0.5 seconds. This system supports automatic device recognition and network setup, reducing commissioning time and boosting operational efficiency.
From the owner or operator’s perspective, the complimentary mySigen app, powered by the intelligent SigenCloud platform, provides complete visibility into system performance. It allows users to monitor energy status, optimise energy management, and utilise features like TOU mode and VPP connectivity, ensuring efficient and personalised energy usage.
“With SigenStack, we’re redefining energy storage for a global audience—modular, intelligent, and future-ready,” founder and CEO Tony Xu says.
“It’s innovation that scales with ambition, wherever you are in the world.”
Visit Sigenergy at Intersolar Europe 2025, May 7–9, at Booth B1.480.
[1] The Capex calculation includes equipment costs, EMS devices, rental of installation tools, supervisor service fees, and commissioning. The total exceeds €20,000 (US$22,750).
