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First-in-Industry Field Test: Sungrow 1+X 2.0 Modular Inverter Leads DC-Side Safety Innovation
The joint field test evaluated performance under four typical DC risks: short circuits, arc faults, loose-connection overheating, and low-magnitude overcurrent.
Traditional combiner boxes using copper fuses as the protection device often fail to disconnect rapidly under short-circuit fault conditions due to copper's high melting point. This can lead to sustained arcing, which may instantly burn through the fuse box and damage nearby components. Combined with a multi-breakpoint topology design, it significantly improves arc suppression and response speed.
During the test, the team replaced one silver fuse in the test combiner box with a copper fuse to compare their behavior under the same short-circuit fault. When the short circuit fault was triggered, the copper fuse produced a strong arc flash and was burned through, while the silver fuse completed disconnection within milliseconds.
Arc faults are among the most destructive risks on the DC side. At high voltage, the arc temperature can instantly exceed 3000°C, creating a serious fire hazard. During the field test, At the same time, , quickly isolating the risk and preventing fault propagation. fault propagation with no equipment damage or ignition occurred.
" ," explained a Sungrow expert. The expert added that Sungrow's pioneering DC parallel arc protection technology, equipped with an intelligent arc diagnosis algorithm, can adaptively adjust protection thresholds for different scenarios and operating conditions, accurately identify arc faults, and disconnect to ensure plant safety.
Loose connections at DC terminals often go undetected in utility plants. Their initial temperature rise is slow, making it difficult for traditional overcurrent protection to detect anomalies in time, which can lead to inverter overtemperature shutdowns. The 1+X 2.0 modular inverter uses high-precision NTC temperature sensors and intelligent algorithms to continuously monitor temperatures, issue early warnings, and isolate potential faults.
During the test, a loose connection was deliberately triggered. The temperature at the tested PV terminal contact rose slowly at about 0.5–2°C per minute and gradually stabilized. The 1+X 2.0 monitored these changes in real time,
Traditional fuse solutions rely on fault current magnitude for disconnection. Under hidden faults such as low-magnitude overcurrent, fuses often cannot react in time, and prolonged current stress may damage key components like IGBTs. Sungrow pioneered the pyro-fuse protection scheme, which integrates three core mechanisms on top of traditional fuses: active arc control, high-efficiency cutting, and strong arc suppression.
During the field test, a short-circuit fault was deliberately induced. The results showed that the 1+X 2.0 disconnected the faulted circuit precisely in just . After disconnection, . By comparison, a traditional fuse solution took 526 milliseconds to complete disconnection, demonstrating the pyro fuse scheme's significant advantage in speed and protection accuracy.
Besides, the pyro fuse can detect up to , enabling proactive forced disconnection to secure inverter integrity.
TÜV Rheinland expert Tian Xingxin, who witnessed the full field tests, affirmed that the 1+X 2.0 modular inverter and its Intelligent DC-Side Full-Scope Safety Solution successfully passed all challenges. He highlighted the system's leading capabilities in proactive detection, precise disconnection, and system-level protection. This not only provides a verifiable technical pathway for ensuring DC-side safety in utility-scale plants, but also offers a reference for the industry to explore higher-level safety measures.
As global solar projects move toward larger scales and higher system voltages, DC-side safety requirements continue to intensify. The Sungrow 1+X 2.0 introduces a new, verifiable safety standard for the industry, offering plant operators and investors enhanced assurance for long-term reliability.
Sungrow, a global leader in renewable energy technology, has pioneered sustainable power solutions for over 28 years. As of June 2025, Sungrow has installed 870 GW of power electronic converters worldwide. The Company is recognized as the world's most bankable PV inverter and energy storage company (BloombergNEF). Its innovations power clean energy projects across the globe, supported by a network of 520 service outlets guaranteeing excellent customer experience. At Sungrow, we're committed to bridging to a sustainable future through cutting-edge technology and unparalleled service. For more information, please visit: www.sungrowpower.com.
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