Shenzhen, July 2026 — Longlight Energy (Shenzhen) Co., Ltd today announced the release of the LL-IV1500, a next-generation high-voltage I-V curve tracer designed for string-level performance testing in utility-scale PV plants. Supporting systems up to 1500 V and string currents up to 30 A, the instrument delivers an integrated solution for plant commissioning, performance evaluation and troubleshooting.

As utility-scale projects worldwide move to 1500 V architectures, legacy 1000 V testers can no longer keep pace with field requirements. The LL-IV1500 is Longlight Energy's direct answer to this industry pain point.

Key Features

• Wide measurement range: string-level testing up to 1500 V / 30 A, backward compatible with 1000 V and lower-voltage systems;
• High-precision acquisition: 0.1% accuracy for voltage and current, 0.5% for power, with a full I-V curve captured in under one second per string;
• Synchronized irradiance sensing: a wireless irradiance and temperature sensor streams environmental data in real time and automatically converts results to STC;
• Intelligent comparison: a built-in module database compares measured curves against nameplate data and flags out-of-tolerance deviations instantly;
• Wireless operation: remote control via tablet app at distances up to 100 meters keeps technicians safely away from the high-voltage DC side;
• Data management: one-click PDF / CSV report export with cloud storage for complete plant asset documentation.

Built for Harsh Field Conditions

Weighing only 1.2 kg and rated IP65, the LL-IV1500 operates reliably from -20°C to 55°C. Its high-capacity battery supports more than 3,000 string tests per charge — enough for a full day of megawatt-scale commissioning work.

"Investors are demanding ever higher assurance of plant performance, and string-level I-V curve testing is shifting from sampling to full inspection," said Longlight Energy's Product Director. "The LL-IV1500 nearly doubles testing efficiency while moving data management to the cloud, helping O&M teams build a complete health record for every plant."

Availability

The LL-IV1500 is now available for order worldwide. Every unit ships with a factory calibration certificate, a rugged carrying case and a three-year warranty. On-site training and remote technical support are available — please contact our sales team or visit the product page for details.

About Longlight Energy: Longlight Energy (Shenzhen) Co., Ltd specializes in the R&D and manufacturing of PV testing instruments, including I-V curve tracers, EL defect detectors, insulation and hipot testers, and plant O&M diagnostic equipment, serving investors, EPCs and O&M teams in more than 60 countries.