Innovative DC Coupling Architecture Reshapes Solar Storage Systems

On April 10, the 13th International Energy Storage Summit and Exhibition (ESIE2025) officially opened at the Capital International Exhibition Center. Sigen Energy showcased its fully modular solar storage integration solutions, highlighting its advantages in solar storage integration, high-level integration, flexible deployment, and AI intelligence, thereby supporting the new phase of high-quality development in the new energy sector.
As energy prices in the renewable sector enter a phase of full marketization, the energy storage industry is evolving from traditional supporting facilities into a critical backbone of the new power system. This transition plays a vital role in ensuring energy security and promoting a low-carbon transformation. Sigen Energy has seized this significant opportunity, continuously advancing smart solar storage integration systems that cover all scenarios, thereby providing robust support for achieving the “dual carbon” goals. The Sigen Zero Carbon Park solution includes a series of commercial inverters (50kW-125kW) and modular storage systems, widely applicable in industrial parks, commercial centers, data centers, and ground installations. The inverters are designed with reserved storage interfaces, allowing easy adaptation to various modes, whether pure solar, pure storage, or integrated solar and storage configurations, enabling users to flexibly combine setups based on their actual needs.

Value Reevaluation Driven by Price Fluctuations

With energy prices entering a market pricing era, the volatility of renewable energy prices is expected to increase significantly. The ability of energy storage systems to adjust and their level of intelligence are becoming increasingly important. The Sigen commercial solar storage system supports “charge and discharge on demand,” featuring an inbuilt energy management system (EMS) and battery management system (BMS). Combined with AI applications, it allows for millisecond-level data collection and response, automatically adjusting charging and discharging strategies based on real-time changes in electricity prices and load demands. When prices are low, the system prioritizes storage; conversely, during peak prices, it prioritizes discharging to meet load demands or return energy to the grid, helping users implement economic strategies of “buy low, use high” or “buy low, sell high,” significantly enhancing the profitability of energy storage.
The Sigen Zero Carbon Park adopts a fully modular design, greatly simplifying spare parts management and lifecycle maintenance for customers. Each module has a capacity of 12kWh and supports flexible configurations from 50kWh to hundreds of megawatt-hours, allowing customization based on users’ actual storage needs. The commercial inverters with reserved storage interfaces support the installation of solar systems before or after storage systems, effectively lowering initial investment and operational costs, thereby truly unleashing the value potential of energy storage in the era of electricity marketization.

Maximizing Solar Energy Utilization

The Sigen Zero Carbon Park can automatically adjust its energy storage strategy based on the current power supply and demand. When solar generation is abundant, the system prioritizes storing excess energy in batteries. Conversely, when electricity demand exceeds solar capacity, it quickly draws power from the batteries. This dynamic management model maximizes the utilization of solar energy, significantly increases self-consumption rates, reduces reliance on the grid, and effectively saves electricity costs.
Sigen has introduced an innovative DC coupling architecture, allowing an impressive capacity ratio of up to 2. During peak sunlight hours, excess DC energy beyond the load or inverter output capacity can be directly stored in batteries without undergoing AC conversion, significantly enhancing overall system efficiency and energy utilization rates, resulting in a substantial increase in the proportion of green electricity used by enterprises.

Enhanced Energy Storage System Efficiency

Moreover, the DC coupling architecture improves the cycling efficiency of solar storage systems, as energy conversion during charging occurs solely in DC state, avoiding additional losses associated with AC inversion and subsequent DC conversion. This reduction in multiple current and voltage conversions can enhance the system’s round-trip efficiency (RTE) by up to 2%. In large grid-connected projects, the DC coupling system is simpler compared to AC coupling systems, saving on storage inverters and medium-voltage cabinets. Fewer components not only lead to lower initial investment costs but also reduce maintenance workloads, yielding higher returns for customers.

Precise Power Market Matching

In the volatile electricity spot market, market prices and load demands change rapidly. For energy storage systems to fully realize their value, they must possess high flexibility and rapid response capabilities. The Sigen Zero Carbon Park solar storage system deeply integrates AI, utilizing big data analysis and machine learning algorithms to flexibly manage solar generation, energy storage, and grid interaction based on price fluctuations, weather changes, and load variations. This ensures the optimal timing for battery charging and discharging, generating the best energy solutions in real-time, maximizing cost savings, and improving operational efficiency of the storage system. It easily adapts to dynamic pricing, virtual power plants, and other complex demands, providing users with the most intelligent energy experience.

Comprehensive Safety Measures

In terms of battery safety, the Sigen storage system features a battery pack-level safety protection that includes six layers of safety measures: sensors, active fire modules, high-temperature insulation pads, insulated thermal layers, explosion-proof valves, and smoke detectors. This setup allows for zero-distance detection of thermal runaway in battery cells, with responses occurring in seconds—over 60 seconds faster than traditional solutions. Additionally, there is a dedicated fire protection device for every 12kWh, ensuring comprehensive system safety. In contrast, traditional storage systems may experience a fire spreading across the entire storage setup during thermal runaway, leading to extensive damage and slower fire response times.
The Sigen innovative solar storage solution employs an IP66 level fully sealed design, ensuring system stability and safety through maintenance-free features. In comparison, traditional solutions only reach IP55, with more vulnerable components requiring monthly inspections and semi-annual part replacements, along with annual comprehensive maintenance. Furthermore, the modular design of the Sigen storage solution allows for fault module replacements in just two hours, significantly enhancing system reliability, whereas traditional containerized storage systems can take over two days for repairs.
Sigen’s solutions also provide comprehensive monitoring, from automatic device diagnostics to remote inspections, further optimizing smart operational management.

Leading Installation Efficiency

The Sigen solar storage solution not only excels in performance but also significantly outpaces traditional solutions in installation efficiency. Thanks to its modular design and stacked installation, the installation process is greatly simplified, requiring no cranes or concrete foundations. A single system can be installed in under an hour, while the pioneering all-network communication improves communication speed by several magnitudes compared to traditional RS485, supporting device self-recognition and system self-networking, allowing system debugging in just 15 minutes. In contrast, traditional solutions require specialized installation equipment, taking eight hours to install a single system, which greatly increases user wait times and installation costs.

Sigen Zero Carbon Home: Leading Household Energy Management

For residential and small commercial applications, the Sigen Zero Carbon Home solution integrates solar inverters, storage inverters, storage batteries, DC charging modules, and energy management systems. It features the SigenStor solar storage charging all-in-one machine, which supports rapid switching between grid-connected and off-grid modes, providing stable power supply during outages. With efficient energy management, advanced safety features, and innovative AI integration, it has received high recognition from exhibition attendees. The company stated that it will continue to focus on technological innovation and product optimization, continually expanding the application boundaries of solar storage integration, providing more efficient and reliable green energy solutions for various industries, and helping to construct a new power system that accelerates the transition to a low-carbon, efficient, and intelligent energy framework.