What is a solar junction box?

What is a solar junction box?

Essential Guide to Solar Junction Boxes: Composition, Features, and Development

The solar junction box connects the solar cell array composed of solar cell modules and the solar charge control device. It is a cross-disciplinary comprehensive design that combines electrical design, mechanical design, and material science.
The solar cell module junction box is essential in the composition of the solar module. Its primary function is to connect the electricity generated by the solar cell with the external lines. Solar photovoltaic junction boxes are mainly divided into crystalline silicon junction boxes, amorphous, curtain wall junction boxes, explosion-proof junction boxes, etc.

The composition of the photovoltaic junction box

The photovoltaic junction box comprises three parts: box body, cable, and connector.

The box body includes: box bottom (including copper terminal or plastic terminal), box cover, diode;

Cables are divided into: 1.5MM2, 2.5MM2, 4MM2 and 6MM2 and other commonly used cables;

There are two types of connectors: MC3 and MC4;

Diode model: 10A10, 10SQ050, 12SQ045, PV1545, PV1645, SR20200, etc.;

There are two diode packages: R-6 SR 263

Photovoltaic Junction Box: Technical Specifications and Features

Technical Specifications:

• Maximum Operating Current: 16A
• Maximum Withstand Voltage: 1000V
• Operating Temperature Range: -40～90℃
• Maximum Working Humidity: 5%～95% (non-condensing)
• Waterproof Grade: IP65
• Cable Specification: 4mm

Key Features:

The photovoltaic junction box is a pivotal component, tested under standard conditions (temperature 25 degrees, AM1.5, 1000W/M2), usually denoted in WP or W, representing its nominal power.

1. High-Quality Shell: Manufactured with imported premium raw materials, it offers exceptional anti-aging and UV resistance.
2. Durability: Suitable for harsh environmental conditions, ensuring optimal performance for over 25 years.
3. Customizable Terminals: Can incorporate 2 to 6 terminals as required.
4. Quick-Connect Plug-In: Facilitates various connection methods.

Development Direction:

Junction boxes are integral to solar cell modules. Leader Solar is dedicated to delivering high-quality junction boxes with high rated current, superior waterproofing, excellent heat dissipation, and low resistance, catering to the evolving needs of the photovoltaic market.

The advent of intelligent photovoltaic monitoring heralds the emergence of smart junction boxes, a future development trend. These intelligent boxes enable real-time monitoring of each component’s operational status and feature maximum output point tracking, optimizing power generation and fulfilling component-level monitoring requirements.

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