The installation of the junction box for solar panels is one of the important steps in the installation process of solar photovoltaic systems. The following are the detailed installation steps:
1. Prepare tools and materials
Tools: Screwdrivers (including M4 flat-head screwdrivers and M4 cross-head screwdrivers), wire strippers, insulating tape, multimeter, etc.
Materials: Junction box, wires (ensure specifications meet system requirements), sealed joints (such as G7 cable sealed joints), grounding screws (if necessary), etc.
2. Check the junction box and solar panels
Junction box inspection: Confirm that the junction box is undamaged and that all internal components (such as bypass diodes, terminal blocks, etc.) are complete and in good condition.
Inspection of solar panels: Confirm that the surface of the panels is undamaged, the terminal blocks are clear and free from oxidation, and prepare the positive and negative wires of the panels.
3. Open the junction box cover
Use a screwdriver: According to the markings on the junction box, insert the M4 flat-head screwdriver into the installation hole on the box cover, gently lift one corner of the box cover, and then lift the other corners in sequence until the box cover is fully opened.
4. Connect the wires
Stripping: Use a wire stripper to remove the insulation layer at one end of the wire, exposing a certain length of metal wire.
Insert the sealing joint: Pass the stripped wire through the G7 cable sealing joint (or other suitable sealing joint), ensuring that the sealing joint fits the wire tightly.
Connect the terminal block: Insert the wire into the terminal block inside the junction box and ensure that the wire is in close contact with the terminal block.
Tightening screws: Use an M4 cross-head screwdriver to tighten the pressing screws of the terminal posts and secure the wires.
5. Check the wiring quality
Use a multimeter: Check if the wiring inside the junction box is secure. Use a multimeter to measure the resistance between the positive and negative poles of the solar panel and the terminal blocks inside the junction box, ensuring that the resistance value is within a reasonable range.
6. Cover the junction box cover
Fix the junction box cover: After confirming that the wiring is correct, put the junction box cover back in its original position. Use an M4 cross-head screwdriver to screw the self-tapping screw into the screw hole and secure the junction box cover.
7. Grounding treatment (if necessary)
Install the grounding screw: On the back of the solar panel (if there is a grounding screw hole designed), install the grounding screw properly.
Connect the grounding wire: Fix one end of the grounding wire to the grounding screw and connect the other end to the grounding device of the system to ensure the system is safely grounded.
8. Clean up the site and conduct an inspection
Clean up the site: Remove the garbage and debris generated during the installation process to keep the installation site clean and tidy.
System inspection: Inspect the entire photovoltaic system to ensure that all components are securely installed and the wiring is correct.
Precautions
Safe operation: During the installation process, safety operation procedures should be followed to prevent the occurrence of safety accidents such as electric shock and short circuit.
Waterproof and moisture-proof: Ensure that the junction box has good sealing to prevent moisture and dust from entering the box and affecting the safety and reliability of the electrical connection.
Regular inspection: After installation is completed, the working condition of the junction box and the electrical connection situation should be inspected regularly. If any problems are found, they should be dealt with promptly.
