Innovative DC Coupling Architecture Transforms Solar Energy Storage Systems as Sigen New Energy Debuts at ESIE Energy Storage Expo

On April 10, the “13th International Energy Storage Summit and Exhibition (ESIE2025)” was grandly inaugurated at the Capital International Exhibition Center. Sigen Energy made a significant presence with its fully modular photovoltaic and energy storage integration solutions, showcasing its leading advantages in solar-storage integration, high-level integration, flexible deployment, and AI intelligence, helping the new energy sector move towards a new phase of high-quality development.

As new energy prices fully enter the market-driven stage, the energy storage industry is evolving from traditional ancillary facilities to a crucial support system for the new power framework, becoming a vital force in ensuring energy security and promoting low-carbon transitions. Sigen Energy has keenly identified this critical opportunity, continuously advancing its intelligent solar-storage integration systems that cover all scenarios, providing solid support for the realization of dual carbon goals.

The Sigen Zero Carbon Park solution includes a series of commercial inverters (50kW-125kW) and modular energy storage systems, which can be widely applied in industrial parks, commercial centers, data centers, and ground settings. The inverters have reserved energy storage interfaces that easily adapt to various modes, whether purely solar, purely storage, or integrated solar-storage configurations, allowing users to flexibly combine setups based on actual needs.

As electricity prices fluctuate, the value of energy storage is being re-evaluated. With the entrance of market pricing for electricity, the volatility of new energy prices will significantly increase, making the regulation capability and intelligence of energy storage systems increasingly important. The Sigen commercial solar-storage system supports a “charge and discharge as needed” function. The system is equipped with self-developed Energy Management System (EMS) and Battery Management System (BMS), combined with AI applications, which allow for millisecond-level data collection and responses. It can automatically adjust charging and discharging strategies according to real-time changes in electricity prices and load demands, prioritizing energy storage during off-peak pricing and discharging during peak pricing, helping users achieve economic strategies of “buy low, use high” or “buy low, sell high,” significantly enhancing storage profitability.

The Sigen Zero Carbon Park employs a fully modular design, greatly facilitating spare parts and lifecycle maintenance for customers. Each module has a capacity of 12kWh, supporting flexible configurations from 50kWh to 100MWh based on specific storage needs. The commercial inverters offer energy storage interfaces that permit the installation of solar first followed by storage, or vice versa, effectively reducing initial investment and operational costs for users, and unlocking the value potential of energy storage in the era of market-driven electricity.

Maximizing photovoltaic consumption becomes a key factor for profitability. The Sigen Zero Carbon Park can automatically adjust its storage strategy based on current electricity supply and demand: when photovoltaic generation is surplus, the system will prioritize storing excess energy in batteries; when electricity demand exceeds photovoltaic generation, it will instantaneously draw power from the batteries for supply. This dynamic management model maximizes the utilization of photovoltaic energy, significantly increasing self-consumption rates, reducing reliance on the grid, and effectively saving electricity costs.

The innovative direct current coupling architecture introduced by Sigen Zero Carbon Park allows a matching ratio of up to 2. During peak sunlight hours, excess DC energy beyond the load or inverter output capacity can be directly stored in energy storage batteries without undergoing AC conversion, significantly enhancing overall system efficiency and energy utilization. This increases the proportion of green electricity for enterprises. Furthermore, the direct current coupling architecture enhances the cyclic efficiency of the solar-storage system, as energy conversion only occurs in DC state during charging, avoiding additional losses from AC inversion and subsequent DC conversion, potentially improving system round-trip efficiency (RTE) by up to 2%.

In large grid-connected projects, the direct current coupling system is simpler compared to the alternating current coupling system, saving on energy storage converters and medium-voltage cabinets. Fewer components not only imply lower initial investment costs but also reduce maintenance workload, bringing higher returns to customers.

In the volatile electricity spot market, rapid changes in market prices and load demand necessitate that energy storage systems possess high flexibility and responsiveness to fully realize their value. The Sigen Zero Carbon Park solar-storage system integrates artificial intelligence deeply, utilizing big data analysis and machine learning algorithms. This enables the system to flexibly manage photovoltaic generation, energy storage, and grid interaction based on electricity price fluctuations, weather changes, and load variations. It automatically optimizes the timing of battery charging and discharging, generating the best energy solutions in real time, minimizing electricity costs, and improving the operational efficiency of the energy storage system. This adaptability allows users to seamlessly accommodate dynamic pricing, virtual power plants, and complex electricity trading scenarios, providing the most intelligent energy experience.

Regarding battery safety, the Sigen energy storage system incorporates battery pack-level safety protections, including sensors, active fire suppression modules, high-temperature insulation pads, insulated heat layers, explosion-proof valves, and smoke detection devices, offering six layers of battery safety protection. This setup detects thermal runaway in battery cells at zero distance, responding to battery thermal runaway in under a second, which is over 60 seconds faster than traditional solutions. Additionally, there is an independent fire suppression device for every 12kWh, ensuring comprehensive system safety. In contrast, traditional energy storage systems often allow thermal runaway to spread throughout the system, posing extensive risks and having slower fire suppression responses that fail to contain the situation promptly.

The Sigen innovative solar-storage solution features an IP66-rated fully sealed design, ensuring maintenance-free operation that bolsters system stability and safety. Traditional solutions only achieve IP55 ratings, having more vulnerable components that require monthly inspections and part replacements every six months, along with annual comprehensive maintenance. Furthermore, the modular design of Sigen energy storage solutions allows for module replacement in just two hours, greatly enhancing system reliability, while traditional containerized energy storage systems often take over two days for repairs. The Sigen solution also offers comprehensive oversight from device diagnostics to remote automatic inspections, further optimizing intelligent operational management.

The Sigen solar-storage solution not only excels in performance but also significantly outperforms traditional solutions in installation efficiency. Thanks to its modular design and stackable installation, the installation process is greatly simplified, requiring no cranes or poured foundations, and can complete the installation of a single system in under an hour. It has pioneered fully networked communication, achieving several orders of magnitude improvement in speed over traditional RS485 communication, supporting device self-identification and system self-networking, and enabling system adjustments within 15 minutes. In contrast, traditional solutions require specialized installation equipment, with single system installations taking up to eight hours, drastically increasing user wait times and installation costs.

For home energy management and small commercial applications, the Sigen Zero Carbon Home solution integrates photovoltaic inverters, storage converters, storage batteries, DC charging modules, and energy management systems, launching the SigenStor solar-storage charging integrated machine. This device supports rapid switching between grid-connected and off-grid modes, providing stable power supply during outages. Its efficient energy management, advanced safety features, and innovative AI integration have garnered high recognition from exhibition attendees. The company stated that it will continue to focus on technological innovation and product optimization, constantly expanding the application boundaries of solar-storage integration, providing more efficient and reliable green energy solutions for users across various industries, and helping to build a new power system that accelerates the transition to a low-carbon, efficient, and intelligent energy framework.