What does China PV Junction Box look like

China PV Junction Box currently on the market circulation of constant temperature at 75 ℃ ambient temperature, through the nominal rated current for 1 hour, the diode junction temperature above 179 ℃, which is a very scary data. Components friends do know that the temperature should be laminated components about 150 ℃, 179 ℃ the temperature can think about how dangerous, because we are measuring the surface temperature of the diode box, diode chip temperature will be higher , the diode pins are copper, thermal conductivity of copper is much higher than the thermal conductivity of plastic packaging materials, so the terminals will be very high temperatures, present, many manufacturers in order to reduce the diode junction box in the body's internal thermostat box, the terminal design is very large, in order to transfer heat to the diode terminals, do meet the diode junction temperature when the TUV test requirement, but the heat because it is the plastic shell, the heat is distributed is very slow, so meet the TUV test no problem, because the test condition is rated current through 1h.

The other is 1.25 times the rated current through 1h, then do not calculate the temperature of the diode section, many currently on the market at this time of the thermostat junction box has been above 200 ℃, heat junction box itself may be deformed, but at this time to determine the required standards in accordance with the standard diode just look at the functionality, do not look at the other. However, the practical application of process components, the occurrence of masking effects is uncertain, so if a long time to work, heat dissipation is not out for a long time accumulation, docking junction box itself is a huge potential threat to the safety and lead back the possibility of adhesive layer is completely soft there. This article from the Global Photovoltaic Network