The photovoltaic connector is a transit hub that successfully links the key components of the solar power generation system. It can be called the main artery of the solar power generation system. The photovoltaic connector and solar cable connector are required to connect with the junction box, module and inverter.
In the report "review and analysis of factors affecting photovoltaic power generation" published by the Solar Bankability project of the European Union Horizon2020 program, connector damage and burning ranked second among the TOP20 risks of power plant technical failure in terms of loss of power generation revenue. How to install the photovoltaic connector properly is a problem that can not be overlooked in the construction process.
The ROOT CAUSE OF connector failure: IN the case of through current, the increase of resistance causes the temperature rise to increase and exceed the temperature range that the plastic shell and metal parts can withstand. In addition to the quality of the product itself, poor installation is one of the primary factors inducing the rise of resistance.
* Non-standard installation increases the risk of connector failure, causing a chain reaction such as system downtime, increased O&M costs, fire risk, etc.
How do I install a PV connector?
Step 1: Strip the wire
The stripping length is 6 to 7.5mm. The number of copper wires cut during the stripping process is not more than five. Specialist wire strippers are prescribed to guarantee the quality of the stripping.
Approved tools:
PV - Mr. AZM stripping pliers
Suitable for 1.5mm2, 2.5mm2, 4mm2, 6mm2, and 10mm2 wires with block (marked with cross-sectional area) and length locator.
Step 2: crimp
Open the well and hold the clamp, place the metal core on the appropriate section area, with the opening facing up, press until the opening contacts the crimping die, then insert the stripping end of the cable until the insulation layer of the cable touches the crimping core, and finally press entirely.
Expert crimping, in the appearance should be no broken wire, wire leakage and rough edge, symmetrical around, copper wire before and after the correct position. Using a 4mm2 cable as an example, the IEC 60352-2 standard requires a pull-off force of at least 310N and crimping resistance of less than 135 μω for the open crimping end of a metal needle.
Approved tools:
PV - CZ crimping pliers
Easy to operate, can automatically return the metal core, high crimping efficiency. The block (marked with cross-sectional area) and positioning block can be replaced as required. Crimp quality is predictable, crimp resistance is tiny and stable.
Step 3: Insert
Insert the cable end into the insulation. When it is installed in place, a "ticking sound" will be heard. Pull it out lightly in reverse to verify that the connection is stable, and then tighten it with a wrench. Finally, the positive and negative connectors are inserted simultaneously. The sound of "ding" indicates that the connector is inserted in place.
Although the photovoltaic connector accounts for a low proportion of the cost in the photovoltaic power station, it is a key component and still requires to be paid enough attention. Reliable quality of photovoltaic connectors and correct installation methods are one of the conditions to assure the regular and stable operation of photovoltaic power stations. Only stable operation of photovoltaic power stations can assure the power generation of the power station and assure the constant income of investors.