Sige’s Innovative DC Coupling Architecture Transforms Commercial Solar Energy Storage Systems

On April 10, 2025, Sigen New Energy unveiled its fully modular photovoltaic storage integration solution in Beijing. This innovative product showcases significant advantages in photovoltaic storage integration, high-level integration, flexible deployment, and AI intelligence, facilitating the transition to a new stage of high-quality development in the renewable energy sector.

As renewable energy pricing enters a fully market-driven phase, the energy storage industry is evolving from traditional support facilities into a crucial component of the new power system. This transformation is instrumental in ensuring energy security and promoting low-carbon transitions. Sigen New Energy has keenly identified this important opportunity and is continuously advancing an intelligent photovoltaic storage integration system that comprehensively supports the achievement of the “dual carbon” goals.

The Sigen Zero Carbon Park solution includes a series of commercial and industrial inverters (ranging from 50kW to 125kW) and modular storage systems, which can be widely applied in various scenarios such as industrial parks, commercial centers, and data centers. These inverters are designed with storage interfaces that allow users to easily adapt to multiple configurations, whether purely photovoltaic, purely storage, or a combination of both, depending on their actual needs.

Reevaluating Storage Value Amidst Price Fluctuations

As electricity prices become market-driven, the volatility of renewable energy prices will increase significantly. The adjustment capability and intelligence of storage systems are becoming increasingly vital. The Sigen commercial photovoltaic storage system supports a “charge and discharge on demand” feature. This system includes a self-developed Energy Management System (EMS) and Battery Management System (BMS), which, combined with AI applications, allows for millisecond-level data collection and response. It can automatically adjust charging and discharging strategies based on real-time changes in electricity prices and load demands. When electricity prices are low, the system prioritizes energy storage; conversely, during peak pricing, it prioritizes discharging to supply loads or feed back into the grid, helping users implement economic strategies of “buy low, use high” or “buy low, sell high,” significantly boosting storage returns.

The Sigen Zero Carbon Park employs a fully modular design, greatly facilitating spare parts and lifecycle maintenance for customer power stations. Each module has a capacity of 12kWh, supporting flexible configurations from 50 kilowatt-hours to hundreds of megawatt-hours based on the user’s actual storage needs. The commercial inverter’s storage interface allows for either the installation of solar panels first followed by storage, or vice versa, effectively reducing initial investment and operational costs while unleashing the value potential of storage in a market-driven era.

Maximizing Photovoltaic Consumption for Enhanced Efficiency

The direct current (DC) coupling architecture reduces costs and increases efficiency, maximizing green power usage. The Sigen Zero Carbon Park can automatically adjust its storage strategy based on current power supply and demand. When photovoltaic generation exceeds demand, the system prioritizes storing surplus energy in batteries. Conversely, when demand exceeds photovoltaic output, it instantaneously draws power from the battery. This dynamic management model maximizes photovoltaic utilization, significantly increasing self-consumption rates and reducing user dependence on the grid, leading to substantial savings on electricity costs.

Sigen has innovatively introduced a direct current coupling architecture with a capacity ratio of up to 2. During peak sunlight hours, any excess DC power that exceeds load or inverter output capabilities can be stored directly in the storage batteries without requiring AC conversion, significantly enhancing overall system efficiency and energy utilization rates, thereby greatly increasing the proportion of green electricity for enterprises. Additionally, the direct current coupling architecture improves the energy conversion efficiency of the photovoltaic storage system, as energy conversion only occurs in the direct current state during charging, avoiding additional losses from AC inversion and subsequent DC conversion, which can enhance round-trip efficiency (RTE) by up to 2%.

In large grid-connected projects, compared to AC coupling systems, DC coupling systems are simpler, saving on storage inverter and medium-voltage cabinet costs. Fewer components not only translate to lower initial investment costs but also reduce maintenance workloads, providing higher returns for customers.

Accelerating Green Power Trading with Intelligent Dispatching

In the fluctuating environment of the electricity spot market, where market prices and load demands change rapidly, storage systems must possess high flexibility and responsiveness to fully realize their value. The Sigen Zero Carbon Park photovoltaic storage system deeply integrates artificial intelligence with big data analytics and machine learning algorithms. This integration allows the system to flexibly manage photovoltaic generation, storage, and grid interaction based on price fluctuations, weather changes, and load variations. It automatically optimizes the timing of battery charging and discharging, generating real-time optimal energy solutions, thereby minimizing electricity costs and enhancing storage system operational efficiency. This adaptability enables seamless integration into dynamic pricing, virtual power plants, and various complex scenarios, delivering the most intelligent energy experience for users.

Comprehensive Battery Safety Protections

In terms of battery safety, the Sigen storage system employs battery pack-level safety protections that include sensors, active fire-fighting modules, high-temperature insulation pads, insulating layers, pressure relief valves, and smoke detection devices. This six-tier safety protocol enables zero-distance detection of thermal runaway in battery cells, responding to thermal events in seconds—over 60 seconds faster than traditional solutions. Additionally, there is an independent fire-fighting device for every 12kWh, ensuring comprehensive system safety. In contrast, traditional storage systems often allow thermal runaway incidents to propagate throughout the entire system, leading to extensive fire risks and slower response times for fire-fighting devices, which are unable to contain incidents promptly.

Maintenance-Free Design with 24/7 Monitoring

The innovative Sigen photovoltaic storage solution features an IP66-rated fully sealed design, ensuring system stability and safety with a maintenance-free design. In comparison, traditional systems only achieve an IP55 rating, with more easily damaged components requiring monthly inspections and replacement every six months, along with annual comprehensive maintenance. Moreover, the modular design of the Sigen storage solution allows for fault module replacements within just two hours, vastly improving system reliability, while traditional containerized storage systems may require over two days for repairs. The Sigen solution also provides comprehensive monitoring, including automatic device diagnostics and remote inspections, further optimizing intelligent operations management.

Efficient Installation and Deployment of Photovoltaic Storage Systems

The Sigen photovoltaic storage solution not only excels in performance but also significantly outperforms traditional systems in installation efficiency. Thanks to its modular design and stackable installation, the installation process is greatly simplified, requiring no cranes or foundation pouring. A complete system installation can be achieved in under an hour. Additionally, the solution introduces an all-network communication system that enhances communication speed by several orders of magnitude compared to traditional RS485 systems, supporting device self-recognition and automatic networking, allowing for system debugging to be completed in just 15 minutes. In contrast, traditional solutions necessitate specialized installation equipment, with individual system installations taking up to 8 hours, substantially increasing user wait times and installation costs.

Sigen Zero Carbon Home: Setting New Standards in Household Energy Management

For residential and small commercial applications, the Sigen Zero Carbon Home solution integrates photovoltaic inverters, storage converters, energy storage batteries, DC charging modules, and energy management systems, launching the SigenStor photovoltaic storage all-in-one machine. This system 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 received high praise from exhibition attendees.

Looking ahead, Sigen will continue to focus on technological innovation and product optimization, continually expanding the boundaries of photovoltaic storage integration applications. The company is dedicated to providing more efficient and reliable green energy solutions across various industries, contributing to the construction of a new type of power system and jointly advancing the energy sector towards a low-carbon, efficient, and intelligent future.