Solving PV module shading problems with the help of MOS(MOS bypass switch) - a new idea from Maysun Solar

· Maysun Solar News,PV Technology News

Why need MOS(MOS bypass switch):Hot spot effect

The hot spot effect is a phenomenon that frequently happens when PV plants are finished and put to service. This phenomenon must be understood before we can understand MOS tubes and bypass diodes. The term "hot spot effect" means:

Solar cells that are shaded during real operation of a PV system cannot produce electricity for a variety of reasons, and in the overall series circuit, the shaded cells are handled as loads (resistors) that draw power from the circuit to produce heat. The hot spot effect refers to this situation, in which a significant amount of heat is produced because the cells are shadowed.

The hot spot effect will cause photovoltaic cells to burn up under extreme heat if it is not addressed.

Solar cells may sustain severe damage from this effect. The shaded solar cells may use some of the energy generated by the sunlit solar cells. A popular approach is to connect a bypass diode in parallel between the positive and negative terminals of the solar cell module in order to stop the energy generated by the lighted module from being used by the shaded module. This prevents solar cells from being destroyed by the hot spot effect.

Hot spot effect

The Old solution: Bypass diode

Bypass diode: To reduce the negative impacts of partial shading and to boost overall power production, a bypass diode is a typical solution integrated into a PV module.

Although bypass diodes have been shown to be successful, there are a few problems with them:

Bypass diodes activate by causing a voltage drop, which can reduce the PV system's overall efficiency. Particularly in instances where the shade is partial, this voltage drop may result in lower power output, lowering module performance.

Limited efficiency in complex shading conditions: When the solar modules are partially shaded, the bypass diode works well. Bypass diodes might not be the ideal choice in more complicated shading scenarios with several shaded zones. In certain circumstances, energy loss may also happen, which could impair the module's functionality.

Bypass diodes hence have limited energy efficiency and versatility, although being effective in standard applications.

Bypass diode

The new solution: MOS(MOS bypass switch)

Mason Solar uses MOS to offer a fresh viewpoint on how to best prepare PV modules for shaded conditions. In comparison to bypass diodes, MOS provides the following special benefits:

Energy efficiency: Two-phase diodes and triodes are current-controlled devices, whereas MOS tubes are voltage-controlled, making MOS more energy efficient.

High efficiency: Compared to bypass diodes, MOS offers a better energy conversion efficiency. Even in complex shaded settings, performance loss is minimized by their structure and characteristics. Higher power generation and better system performance are the outcomes of this.

Rapid adaptation: MOS can swiftly adjust to shifting lighting conditions thanks to their quick response time to changes in light and dark. This adaptability guarantees continuous power production and lessens the effect of shadows on module performance.

Flexibility: MOS can be independently integrated into each unit or set of units, in contrast to bypass diodes, which operate in specific areas of the module. This flexibility maximizes the potential for power generation and enables more accurate manipulation of the shadowing effects.

Reliability: MOS tubes are more thermally stable and less prone to overheat since they only have a majority of the current carriers involved in the conductivity, as opposed to two diodes and triodes, which have both a majority and a minority of current carriers involved. The PV module's longer service life and improved dependability are both influenced by this attribute.

MOS tube

Maysun's application of MOS tubes

Mason Solar introduces MOS to provide a new perspective on optimizing PV modules for shading situations. Compared to bypass diodes, MOS has some unique advantages of their own:

Increase power production: MOS increases the power generated by the PV module when it is shaded, making it more energy-efficient and secure to use the PV module while shaded.

Only one junction box is required: With MOS installed, there is no longer a requirement for a junction box in the module; all that is left is the junction box with lead wires on both ends.

Greater durability: MOS are more durable since they may be bundled with the assembly for better protection and are smaller than other diodes and triodes.

More flexible: MOS can conduct electricity in both the forward and backward directions, making them more flexible as electrical switches that help to maximize power production.

pv module with MOS tube

The use of MOS by Maysun Solar in place of bypass diodes marks a substantial improvement in increasing the effectiveness of PV modules in shade. While bypass diodes are a tried-and-true method with benefits of their own, MOS is more effective, more versatile, and better suited for complex shading conditions.

Maysun Solar has concentrated on making different solar modules since 2008, and in the near future, VenuSun products with MOS will be offered. Maysun Solar will continually strive for better advancement in the solar sector through unconventional thinking that defies convention.

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