Photovoltaic panel junction box cold soldering

What causes a solder joint deterioration at junction box and inverter?

The degradation of solder joint at electrical connection of by-pass diode in the junction box and IGBT in the inverter might be induced by repeated heat cycles. The PV fire and heat damage occurred at junction box and inverter might be caused by DC arcing at the crack caused by solder joint fatigue. H.

Can a PV junction box be used with multiple rated currents?

If the PV junction box is intended to be used with several types and/or combinations of bypass diode and/ or with several rated currents of the PV junction box, the tests must be performed in all possible combinations with the relevant number of specimens. Another consideration is whether or not the PV junction box is potted.

Which solder joint is used for electrical connection in crystalline Si solar cell?

In the conventional PV module system based on crystalline Si solar cell, solder joint has been used for electrical connection in the four positions such as (1) Cu ribbon interconnection on Ag electrode of Si solar cell, (2) electrical connection of Cu ribbon, (3) by-pass diode connection in the junction box, (4) inverter connection.

How to test a PV junction box?

To check if the PV junction box is suitable to be mounted or operated at lower temperatures, a cold impact test has to be performed. After storing the PV junction box for a minimum of 5 hours in a test chamber having a temperature of –40°C, four impacts, each having an energy of 1J, will be administered to the box in different positions.

Did a production error lead to cold solder joints?

In the run-up to pv magazine ’s quality roundtable at Intersolar Europe, we look at a case where a production error resulted in cold solder joints in 5% of the solar modules across a 50 MW project portfolio.

What if a PV junction box is attached without screws?

If they are attached without screws, there must be one or several detectable facilities, for example recesses, which enable tools to be deployed in order to remove the lids or other parts. Precautions must be taken for preventing the lid being lost from a PV junction box that is intended to be re-opened.