Innovative DC Coupling Architecture Transforms Solar Energy Storage Systems: Sige New Energy Shines at ESIE Energy Storage Expo

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 made a significant appearance, showcasing its fully modular solar-storage integration solution, which highlights its leading advantages in solar-storage integration, high integration, flexible deployment, and AI intelligence, supporting the advancement of renewable energy into a new stage of high-quality development.

As the pricing of renewable energy enters a fully market-oriented phase, the energy storage industry is evolving from traditional supporting facilities to an essential pillar of the new power system, becoming critical for energy security and driving low-carbon transformation. <b>Sigen Energy</b> has keenly identified this opportunity and continues to advance an intelligent solar-storage integration system covering all scenarios, providing solid support for achieving the "dual carbon" goals. The <b>Sigen Zero Carbon Park</b> solution includes a series of commercial inverters (50kW-125kW) and modular energy storage systems, applicable in various scenarios such as industrial parks, commercial centers, data centers, and ground installations. The inverters feature a reserved energy storage interface, allowing easy adaptation to various modes including pure solar, pure storage, or integrated solar-storage, enabling users to flexibly configure according to their actual needs.

<b>Reassessing Storage Value Driven by Electricity Price Fluctuations</b>
With the era of market-determined electricity prices, the volatility of renewable energy prices is expected to increase significantly. The adjustment capability and intelligence of energy storage systems are becoming increasingly important. The <b>Sigen commercial solar-storage system</b> supports a "charge and discharge as needed" function. The system is equipped with self-developed EMS and BMS, combined with AI applications, enabling millisecond-level data collection and response. It can automatically adjust charging and discharging strategies based on real-time electricity prices and load changes. When prices are low, the system prioritizes energy storage; during peak pricing, it discharges to the load or feeds back to the grid, helping users implement economic strategies such as "buy low, use high" or "buy low, sell high," significantly enhancing storage profitability.

The <b>Sigen Zero Carbon Park</b> employs a fully modular design, greatly facilitating spare parts availability and lifecycle maintenance for customer stations. Each module has a capacity of 12kWh, supporting flexible configurations from 50kWh to hundreds of megawatt-hours, allowing customization based on actual storage requirements. The commercial inverters support a reserved energy storage interface, allowing for photovoltaic installation before or after energy storage installation, effectively lowering users' initial investments and operational costs, thus fully realizing the potential value of storage in the era of electricity marketization.

<b>Maximizing Photovoltaic Utilization</b>
The <b>Sigen Zero Carbon Park</b> can automatically adjust energy storage strategies based on current power supply and demand conditions: when photovoltaic generation exceeds demand, the system prioritizes storing excess energy in batteries; when demand exceeds generation, it instantly draws power from the batteries. This dynamic management model maximizes the utilization of photovoltaic generation, significantly increases self-consumption rates, reduces dependence on the grid, and effectively saves electricity costs.

Furthermore, the innovative DC coupling architecture allows for a capacity ratio of up to 2. During peak sunlight hours, excess DC energy that exceeds the load or inverter output can be stored efficiently in batteries without going through AC conversion. This significantly enhances the overall system efficiency and energy utilization, greatly increasing the proportion of green electricity for enterprises.

Additionally, the DC coupling architecture improves the circulation efficiency of the solar-storage system, as energy only needs to be converted in DC mode during charging, avoiding additional losses from AC inversion and subsequent DC conversion. This reduces energy losses caused by multiple current and voltage conversions, with the system's round-trip efficiency (RTE) potentially increasing by up to 2%. In large grid-connected projects, the DC coupling system is simpler compared to AC coupling systems, saving on energy storage inverters and medium-voltage cabinets. Fewer devices not only mean lower initial investment costs but also less maintenance work, resulting in higher returns for customers.

<b>Precise Matching with Power Market Dynamics</b>
In the context of a volatile electricity spot market, where prices and load demands change rapidly, energy storage systems must possess high flexibility and responsiveness to fully realize their value. The <b>Sigen Zero Carbon Park</b> solar-storage system deeply integrates artificial intelligence, utilizing big data analysis and machine learning algorithms to manage photovoltaic generation, energy storage, and grid interaction dynamically. It automatically optimizes the timing of battery charging and discharging, generating optimal energy solutions in real-time to minimize electricity costs and enhance the operational efficiency of the storage system, easily adapting to dynamic pricing, virtual power plants, and complex electricity trading scenarios.

<b>Comprehensive System Safety Protection</b>
In terms of battery safety, the <b>Sigen energy storage system</b> incorporates a multi-layer safety protection mechanism at the battery pack level. This includes sensors, active fire-fighting modules, high-temperature insulation pads, insulating layers, pressure relief valves, and smoke detectors. This system detects thermal runaway in cells at close range, with a response time that is over 60 seconds faster than traditional solutions. Additionally, an independent fire protection device is included for every 12kWh, ensuring comprehensive safety for the system. In contrast, traditional energy storage systems often see fires spreading throughout the entire storage system during thermal runaway, with slower reaction times that hinder timely containment.

<b>Maintenance-Free and Modular Design Ensuring Stability and Reliability</b>
The innovative solar-storage solution from <b>Sigen</b> features an IP66 rated fully sealed design, ensuring system stability and safety with a maintenance-free design. In comparison, traditional solutions only achieve IP55 ratings and contain numerous vulnerable components, requiring routine inspections monthly and part replacements every six months, along with annual comprehensive maintenance. The modular design of the <b>Sigen energy storage solution</b> allows for fault module replacement in just two hours, greatly enhancing system reliability, whereas traditional containerized energy systems take over two days for repairs. The <b>Sigen solution</b> also offers comprehensive monitoring from automatic device diagnostics to remote inspections, further optimizing intelligent operation management.

<b>Significantly Improved Installation Efficiency</b>
The <b>Sigen solar-storage solution</b> not only excels in performance but also leads significantly in installation efficiency compared to traditional solutions. Thanks to its modular design and stackable installation, the installation process is greatly simplified and can be completed in under an hour without the need for cranes or poured foundations. Additionally, its innovative networked communication improves speeds by several orders of magnitude over traditional RS485 communication, supporting device self-recognition and system self-networking, allowing for system debugging in just 15 minutes. In contrast, traditional systems require specialized installation equipment, taking eight hours for a single system installation, which considerably increases user wait times and installation costs.

<b>Sigen Zero Carbon Home Leads Household Energy Management</b>
Targeting household and small commercial application scenarios, the <b>Sigen Zero Carbon Home</b> solution integrates photovoltaic inverters, energy storage inverters, energy storage batteries, DC charging modules, and energy management systems. It features the <b>SigenStor</b> solar-storage charging all-in-one unit, supporting rapid grid and off-grid switching, 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, expanding the application boundaries of solar-storage integration, and providing more efficient and reliable green energy solutions for various industry users, contributing to the construction of a new power system and accelerating the shift towards a low-carbon, efficient, and intelligent energy system.