During SNEC 2023 in Shanghai, DAS Solar and TÜV NORDsigned an agreement for outdoor testing to verify the electrical performance and reliability of N-type modules under 1500V DC voltage. The project, at the Hainan base of the China Testing & Certification International Group (CTC), has now been connected to the grid.
The plant is located in Haikou City, Hainan Province, a location characterized by the high temperatures and humidity of a tropical monsoon climate.
It deploys an N-type TOPCon and a P-type PERC bifacial module string, with a total installed capacity of approximately 33kW, with grid connection via string inverters. There is a fixed mounting system with a 15°tilt angle, and the lowest point of the modules is 1.5 meters above the ground. The project aims to test the PID effects on modules under high-temperature, humid conditions, comparing the difference in kWh/kW power generation rates of the two types of module. In addition to a site-level environmental monitoring station, the plant is equipped with high-precision DC meters, module-level temperature sensors and high-precision irradiance meters. A data collector is connected to the monitoring devices via S485 communication lines, the collector equipped with a 4G wireless module for remote data transfer and download.
DAS Solar will use high-precision on-site sensors and intelligent data analysis modelling for continuous data collection and analysis in outdoor testing, including power generation gains for both module types under varying irradiance levels, temperatures, time intervals and typical sunny conditions. The impact of PIDs will be assessed at different module locations and changes in EL, with subsequent infrared imaging analysis on the outdoor performance of the N-type modules.
“It is of great significance to formally initiate outdoor testing under high temperature and high humidity conditions as part of our partnership with TÜV Nord and CTC,” commented Dr. Song Dengyuan, DAS Solar CTO. “This testing will drill down into factors influencing the reliability of modules under extreme conditions, leading to an overall enhancement in product quality.”