QC Solar 3Qxy Axial diode Junction Box

3Q-M is a high-current junction box. Compared with traditional junction boxes, the high-current photovoltaic junction box has higher current-carrying capacity and better hot-spot protection.

Installation Instructions Specification

20A~30A current available

Multiple outlet methods

TUV/UL Certificate

Waterproof grade up to IP68

Less potting glue

Modular and axial full sealing

High reliable

easy installation

Technical Data

Item	3Qxy(Axial diode)
Terminals for Ribbons	6
Rated Current(IEC/UL)	20A,25A,30A (TUV/UL)
Rated Voltage	1000V,1500V (TUV/UL)
Glue Volume	3*8ml
Reverse Current	55A
Dimensions	67.728.517mm
Temperature Range	—40℃〜 +85℃
Size of Cables	4.0mm²/12AWG 6.0mm²/10AWG
Size of Ribbons	Max.8mm
Protection Grade	IP68
Flammability Class	5VA

Dimensions(mm)

QC Solar QC 3Q-M High-current junction box

With the continuous increase in global attention on renewable energy, the construction of photovoltaic power stations is also increasing day by day. And in the photovoltaic power station, there is a key component that plays an important role silently, and it is the high-current photovoltaic junction box. Compared with traditional junction boxes, high-current photovoltaic junction boxes have higher current carrying capacity and better hot spot protection functions.

First, what is a high-current photovoltaic junction box?

At present, the scheme of upgrading the bypass diode current in the traditional junction box is limited by the junction box structure design, diode packaging standards, and technical requirements, and it is difficult to meet the 210 cell-size panel whose current is upgraded to 30A. Another "modular" junction box is formed by welding and encapsulating the diode chip, plastic encapsulation body, and conductive pins for connecting and carrying current transmission in a modular integrated way, which can shorten the chip heat dissipation distance, increase the heat dissipation efficiency, and at the same time, it can adopt methods such as dual-chip parallel connection to increase the over-current capacity, so that the current can reach 25A and 30A. However, this process requires a large number of new investments in the "modular diode" packaging and testing equipment in the industrial chain.

At the same time, because the outer dimensions of the "modular diode" required by each panel factory are different, it causes the diode company to need to invest in multiple sets of production equipment, molds, etc. according to different customer requirements. The expansion investment is large and the production cycle is long.

The "class module middle-position diode design" 3Q-M junction box of QC SOLAR uses the commonly used and mature R6-packaged diodes in the market. Under the premise of maintaining the same shape, it obtains different rated currents by changing the internal chip size structure design, and the over-current range can be met from20A,25A,30A. More importantly, this design innovatively sets the installation position of the diode in the middle of the two panels return current belt threading holes, and the principle is similar to the "modular diode". When the junction box starts to work, the high-temperature heat of the diode can be evenly dissipated to every corner of the junction box and finally brought out of the junction box.

Second, the advantages of the 3Q-M junction box

1. It is not modular, but better than modular

The "class modular middle-position diode design" adopts single-core axial diode middle-position installation, makes the best use of the box space, and the box size is as small as the modular diode box.

2. Middle-position structure design

Skillfully use the "bending edge heat dissipation technology" and "copper-copper surface welding technology", combined with the "circular diffusion characteristics" of thermal radiation, the heat dissipation effect is more uniform.

3. 20-30A current can be switched freely.

The 3Q-M junction box realizes flexible rated current selection by optimizing the internal chip size structure. Users can choose among various over-current ranges such as 20A, 25A, and 30A according to actual needs.

Third, summary

Compared with the "modular diode" junction box, the "axial middle-position diode" 3Q-M junction box can quickly and low-costly design changes during the upgrade of the module and junction box IEC standards. In addition, the "class modular middle-position diode design" also avoids the difficult problem of upgrading the bypass diode in the traditional junction box, reduces costs, and improves efficiency. In summary, the innovative design of the 3Q-M junction box provides enterprises with a low-cost and high-efficiency solution and achieves the goal of cost reduction and efficiency increase.

Engineering Photovoltaic Projects

In large-scale engineering projects, it has strong current and voltage handling, is suitable, dust-proof and waterproof for reliable connection in harsh conditions.