What is the concept of a direct-drive (DC) and flexible photovoltaic-storage system? What are its characteristics and advantages?

Guided by the “dual carbon” goals, the construction of new power systems is accelerating. Photovoltaic-storage-DC-flexible technology, as a core pathway to solving the problem of new energy consumption and reshaping energy utilization patterns, is gradually moving from the laboratory to large-scale applications.

From zero-carbon buildings in cities to rural energy transition, from industrial parks to data centers, this technology, integrating photovoltaics, energy storage, DC power distribution, and intelligent control, is reshaping the underlying logic of energy production and consumption.

This article will comprehensively analyze the characteristics and prospects of photovoltaic-storage-DC-flexible technology from the perspectives of its essence, core advantages, and current applications.

“Photovoltaic, Energy Storage, DC Power Distribution, Flexibility” (PEDF) is an abbreviation for four integrated technologies that transforms buildings from mere energy consumers into energy producers, storage providers, and regulators.

✅ Photovoltaic: Solar photovoltaic power generation. Utilizing photovoltaic panels installed on building rooftops, curtain walls, and other surfaces, solar energy is converted into electricity, making it a “green generator” for buildings.

✅ Energy Storage: Energy storage systems. Equipped with energy storage batteries (such as electrochemical energy storage), excess electricity is stored when photovoltaic power generation is abundant but electricity demand is low (e.g., at midday); it is released during periods of no sunlight or peak electricity demand, acting as a “reservoir.”

✅ DC Power Distribution: Direct current power distribution. Traditional power grids use alternating current (AC), while photovoltaic power generates direct current (DC). Most modern appliances (such as computers, LED lights, and inverter air conditioners) also use DC internally. A photovoltaic-storage-DC-flexible system establishes a DC microgrid within the building, reducing AC/DC conversion links and energy losses.

✅ Flexibility: Flexible interaction. This is the “soul” of the technology. Through an intelligent control system, the building can flexibly adjust its electrical load based on grid load conditions, electricity price signals, or its own power generation status. For example, when the grid load is high, buildings automatically reduce unnecessary electricity consumption or send electricity back to the grid (V2G, such as electric vehicles discharging electricity), achieving “peak shaving and valley filling” and interacting amicably with the grid.

Compared to traditional building energy supply models, the photovoltaic-storage-DC-flexible system offers significant advantages:

✅ Significantly Improved Energy Efficiency (High Efficiency):
Reduced Conversion Losses: Traditional grid-connected photovoltaic systems require multiple conversions (DC → AC → DC), each resulting in energy loss. The photovoltaic-storage-DC-flexible system utilizes a DC distribution architecture, reducing AC/DC conversion stages and losses. This improves overall system efficiency by 8%-12%, achieving an overall energy utilization efficiency exceeding 92%.

Local Consumption: Photovoltaic power generation is primarily used directly within the building, with surplus energy stored, maximizing the utilization of clean energy.

✅ Safer and More Reliable Electricity Supply (Reliability):
Off-Grid Operation Capability: In the event of grid failures or extreme weather, the photovoltaic-storage-DC-flexible system can switch to off-grid mode, relying on the coordinated power supply of photovoltaics and energy storage to ensure continuous power supply for critical loads such as emergency lighting and security systems, achieving a power supply reliability of over 99%.

Superior Power Quality: DC power supply systems avoid the harmonic interference and frequency fluctuations of AC power, ensuring stable voltage and better compatibility with DC-powered equipment such as LED lights, computers, and inverter air conditioners, extending equipment lifespan.

✅Contributing to Grid Stability and Achieving “Flexible” Load (Intelligent): Peak Shaving and Valley Filling: Buildings transform from traditional rigid electrical loads into adjustable, flexible “energy regulators.” They can automatically adjust their power consumption strategies based on grid load peak and valley periods and electricity price fluctuations—reducing unnecessary electricity consumption or releasing stored energy during peak hours, and storing more energy during off-peak hours, alleviating grid peak-valley pressure and reducing grid expansion costs.

Virtual Power Plant Potential: A large number of photovoltaic-storage-DC-flexible buildings can be intelligently aggregated to form virtual power plants, participating in demand response and ancillary services transactions in the electricity market, creating additional revenue for building operators while improving the overall grid dispatch flexibility.

✅Significant Economic Benefits: Although the initial construction investment for a photovoltaic-storage-direct-drive-flexible system is relatively high, in the long run, it can achieve a return on investment by saving on electricity costs, obtaining demand response subsidies, participating in green electricity trading, and reducing the operation and maintenance costs of equipment such as air conditioners and charging piles, demonstrating good economic performance throughout its entire life cycle.

✅Green and Environmentally Friendly (Low Carbon): Prioritizing the utilization of building-distributed renewable energy sources such as photovoltaics reduces dependence on fossil fuel power generation and significantly reduces carbon emission intensity during building operation, which is one of the core technological pathways to achieving ultra-low energy consumption buildings and near-zero carbon buildings.

With the accelerated industrialization of these technologies, a number of companies have established technological barriers and project advantages in the PV-Shuttle-Robotic (PV-Shuttle-Robotic) field, covering the entire industry chain including system integration, core equipment, and energy management:

The company focuses on clean power generation, transportation electrification, and green ICT energy infrastructure. In the area of ​​”PV-Storage-DC-Flexible” power generation, Huawei has launched a leading solution that deeply integrates photovoltaic power generation, energy storage, DC power distribution, and flexible power consumption. Its technology has been applied to multiple industrial parks and buildings, such as the Antuo Mountain base currently under construction, which aims to create one of the world’s largest near-zero carbon industrial parks integrating PV-Storage-DC-Flexible power generation, significantly reducing energy consumption and carbon emissions through technological means.

Founded in 1997 and headquartered in Hefei, Anhui Province, Sungrow is a leading global manufacturer of new energy power equipment. The company focuses on the research and development and production of solar, wind, energy storage, and hydrogen energy technologies. Its main products include photovoltaic inverters and energy storage systems. In the field of “PV-Storage-DC-Flexible” power generation, Sungrow has actively expanded its presence, launching a PV-Storage-DC-Flexible solution for building applications. This solution integrates photovoltaic power generation, energy storage systems, DC power distribution, and flexible power utilization technologies, aiming to improve building energy efficiency and help achieve “dual carbon” goals.

Founded in 1993 and headquartered in Changji, Xinjiang, TBEA is a leading company in China’s power transmission and transformation industry and a national high-tech enterprise. Its business spans three major areas: high-end manufacturing of power transmission and transformation equipment, new energy, and energy itself. In the fields of photovoltaic, energy storage, DC, and flexible power generation, TBEA leverages its strong power electronics technology and system integration capabilities to provide system solutions including photovoltaic inverters, energy storage converters, and multi-energy complementary microgrids, contributing to the construction of new power systems.

Founded in 2021, this company is a core enterprise under Kehua Data, focusing on the new energy field. Leveraging 37 years of experience in power electronics technology, Kehua Digital Energy is a leading global provider of photovoltaic (PV) and energy storage system solutions, ranking first in China’s energy storage PCS shipments for many consecutive years. In the “PV-Storage-DC-Flexible” field, Kehua Digital Energy, with its dual advantages in data centers (flexible power distribution) and PV energy storage, has innovatively launched an integrated “PV-Storage-Charging-Computing” and flexible energy management solution. It optimizes DC power distribution efficiency through AI algorithms, achieving flexible interaction between power generation, grid, load, and storage, thus contributing to the construction of a new type of power system.

This company is a leading global manufacturer of new energy power equipment, consistently ranking among the top ten globally in photovoltaic inverter shipments. In the field of “PV-Storage-DC-Flexible” power generation, GoodWe is at the forefront of the industry. The company not only provides core photovoltaic and energy storage products but has also launched an integrated “PV-Storage-DC-Flexible” microgrid solution. Through its independently developed Smart Energy Management System (SEMS), it achieves DC power distribution, flexible regulation, and intelligent dispatch, connecting the entire “source, grid, load, and storage” chain, contributing to the construction of low-carbon buildings and new power systems.

Founded in 2007 and headquartered in Shenzhen, Shenzhen Hopewind Electric Co., Ltd. is a national high-tech enterprise specializing in the research and development and manufacturing of new energy and electric drive products. In the field of “photovoltaic-storage-DC-flexible” power generation, Hopewind relies on its strong core power electronics technology and energy efficiency management platform to provide a full range of products covering photovoltaic inverters, power storage converters (PCS), and power quality management systems (SVG). By constructing integrated photovoltaic-storage systems, the company achieves flexible regulation and intelligent dispatching on both the generation and consumption sides, contributing to the creation of a low-carbon, high-efficiency new power system.

Founded in 2002, Shenzhen TAICO Technology Co., Ltd. is one of the few innovative companies that simultaneously focuses on solid-state battery technology and photovoltaic inverter R&D. Its synergistic advantages in both fields are significant, demonstrating strong photovoltaic inverter technology capabilities.

Leading Position in the Solid-State Battery Industry
Core Technology: Focusing on the R&D of lithium iron phosphate and solid-state batteries, providing a complete chain solution from BMS design and PACK integration to energy storage systems.

Application Scenarios: Home energy storage systems (e.g., 48V) 200Ah battery pack, capacity 5-10kWh); Industrial applications (AGV robots, electric forklifts, marine power systems)

Market Positioning: Differentiation Strategy: Combining inverters with self-developed battery technology, launching integrated “photovoltaic-storage-charging” solutions (such as solar + energy storage systems) to improve energy efficiency. Global Layout: Products are exported to Europe and America; continued expansion into the industrial and commercial energy storage market in 2026; customer feedback indicates “comprehensive and highly responsive technical support.”

Advantages: Strong technical capabilities, stable product performance, and a certain degree of competitiveness in the global market, especially in large-scale photovoltaic power plants and industrial and commercial sectors, where it holds a high market share.

TAICO has become a leader in the global photovoltaic field through the synergistic innovation of solid-state battery technology and high-efficiency inverters. Facing short-term market fluctuations, leading companies consolidate their competitiveness through technology integration (such as photovoltaic-storage fusion) and scenario-based solutions (such as TAICO’s “intelligent lithium battery + inverter” system). In the long term, with the explosive growth in energy storage demand and the acceleration of energy digitalization, companies with vertical integration capabilities will dominate market recovery.