Q: Do you know which testing institution can calibrate 12BB battery now?
Answer: 12B8 battery can be calibrated in Japan, Japan has a world-recognized battery calibration institution, domestic similar to Shanxi Lu'an began to do 12B in July 2017, until now are their own calibration to themselves, with components backpropagation, currently close to the level of 5BB, but there is no institution to calibrate the standard film. In addition, Shanghai East China University of Science and Technology has the same high-precision IV test equipment for R&D batteries as LG, which can test 12BB batteries, and South Korea LG are using Denken's 12BB IV test equipment. LG's HBC, HIT and IBC composite G-cell mass production average EFF 24.5%, the laboratory has EFF 26%.
Q: When doing IV testing of high efficiency heterojunction cells, will the voltage over-voltage be a problem due to long exposure time of light source?
A: The voltage will not be over-voltage, the longer the test time, the more accurate the test, long exposure may make the cell temperature rise, so ensure that the temperature of the test site to maintain at 25 +- 1 ℃. It will be fine.
HIT cells and HBC and other high-efficiency batteries are N-type cells, because N-type silicon wafer less sub-life are more than 1000, so the battery is like a capacitor, n-type charging time than P-type long exposure to accurately test, but N-type HIT and other batteries need more than 100 milliseconds, P-type Perc batteries need more than 50 milliseconds, ordinary batteries can be as long as 15 milliseconds.
HIT and HBC batteries are recommended to use more than 100 ms exposure for testing.
Question: Which document specifies the internal charged gap of the module?
Answer: IEC 60664
