23
6.3 Connector
Please keep connectors clean and dry. Make sure connector caps are fastened before connection. Do not connect
connectors under improper conditions of damp, dirty or other exceptional situations
）
. Avoid connectors from direct sun
light and water immersion or falling onto ground or roof.
Incorrect connection may lead to electric arc and electric shock. Please make sure that all electric connection is reliable.
Make sure all connectors are fully locked.
Only compatible connectors can be mated, i.e. from the same vendor and model, shall be used;(If you need to use
different types of connectors, please consult customer service of LONGi solar );.
6.4 Bypass diode
LONGi solar module junction box contains bypass diode which is in parallel connection with the cell string. If hot spot
occurred, the diode will come into operation to stop the main current from flowing through the hot spot cells in order to
prevent module over-heated and performance loss. Notice, bypass diode is not the overcurrent protection device.
If the diode is definite or suspected to be defective, the installer or system maintenance supplier shall contact LONGi.
Please do not try to open the module junction box on your own.
6.5 PID Protection and Inverter Compatibility
①
PV modules may appear Potential Induced Degradation (PID) under high humidity, high temperature and high
voltage condition. Modules may appear Potential Induced Degradation (PID) under the conditions below:
◇
PV modules install under hot and humid weather condition.
◇
PV modules installation site is under long term humid condition such as floating PV system.
②
To reduce the risk of PID, on the modules DC connection site, it is recommended to connect the negative to ground.
The PID protection measures on system level are recommended as follow
◇
For isolated PV inverter, the negative of the PV modules DC connection side can be directly grounded.
◇
For non-isolated PV inverter, isolated transformer is needed to be installed before applying virtual grounding
(grounding method guidance from the inverter manufactures are usually needed)
