What are the disadvantages of solar PERC batteries?

Temperature Coefficient of Power (Pmax)

PERC solar cells often have a lower temperature coefficient of power compared to traditional solar cells. This means that the drop in efficiency with increasing temperature is less pronounced, leading to better performance in hot climates.

Thermal Stability 

PERC cells are known for their thermal stability. This stability allows them to maintain their efficiency levels even when exposed to high temperatures over an extended period.

Temperature-Dependent Voltage 

The voltage of PERC cells may also have a more favorable temperature dependency, contributing to better overall performance in varying temperature conditions.

It's important to note that while PERC technology provides advantages in terms of efficiency and temperature characteristics, other factors such as the overall system design, the quality of the materials used, and proper installation also play crucial roles in determining the overall performance of a solar energy system.

PERC (Passivated Emitter Rear Contact) technology is commonly associated with solar cells, not batteries. Solar cells, including those with PERC technology, are used to convert sunlight into electricity. If you are referring to solar cells, I can provide information on the disadvantages of PERC solar cells. However, if you are indeed asking about PERC batteries, I would appreciate clarification, as PERC is not a term typically associated with battery technology.

Here are some potential disadvantages：

3.2V 20A Low Temp LiFePO4 Battery Cell -40℃ 3C discharge capacity≥70% Charging temperature：-20~45℃ Discharging temperature: -40~+55℃ pass acupuncture test -40℃ maximum discharge rate：3C

READ MORE

Cost

PERC solar cells often involve more complex manufacturing processes, which can increase production costs compared to traditional solar cells. However, as technology advances and economies of scale come into play, these costs may decrease over time.

Fragility

Some PERC solar cells may be more fragile than traditional solar cells due to the additional layers and processes involved in their production. Care must be taken during handling and installation to avoid damage.

Sensitivity to Shading

While PERC cells generally offer improved efficiency, they can be more sensitive to shading. Partial shading of a PERC solar panel can lead to a more significant loss of power compared to traditional cells.

Manufacturing Complexity

The manufacturing process for PERC cells is more intricate than that of traditional solar cells. This complexity could potentially lead to production challenges and variations in performance if not carefully controlled.

Degradation over Time

Like all solar cells, PERC cells can experience some level of degradation over time. However, advancements in materials and manufacturing processes aim to minimize this effect.

Low Temperature High Energy Density Rugged Laptop Polymer Battery Battery specification: 11.1V 7800mAh -40℃ 0.2C discharge capacity ≥80% Dustproof, resistance to dropping, anti - corrosion, anti - electromagnetic interference

READ MORE

It's essential to note that the disadvantages mentioned above are relative, and the technology continues to evolve. Many of these challenges are actively being addressed by researchers and manufacturers in the solar industry to improve the overall performance and cost-effectiveness of PERC solar cells.

Higher Manufacturing Cost of (Passivated Emitter Rear Contact)

Yes, the manufacturing cost of Passivated Emitter Rear Contact (PERC) solar cells can be higher compared to traditional solar cells. Several factors contribute to the increased manufacturing cost of PERC technology:

Complex Manufacturing Process

The production of PERC solar cells involves a more complex manufacturing process compared to traditional solar cells. Additional steps are required to create the passivation layer at the rear of the cell, which can contribute to increased production costs.

Advanced Materials

PERC cells often use advanced materials and coatings to enhance their efficiency. These materials can be more expensive than those used in traditional solar cells, adding to the overall manufacturing cost.

Quality Control

Ensuring the quality and reliability of PERC cells may require more stringent quality control measures during the manufacturing process. This can involve additional testing and inspection steps, contributing to higher costs.

Research and Development Expenses

The development and optimization of PERC technology involve research and development (R&D) expenses. These costs are often factored into the overall manufacturing cost of PERC solar cells.

Low Initial Production Volumes

When a new technology like PERC is introduced, initial production volumes may be lower compared to established technologies. Lower production volumes can result in less efficient use of manufacturing facilities and equipment, leading to higher costs per unit.

It's important to note that as technology advances and PERC becomes more widely adopted, economies of scale and process optimizations can help reduce manufacturing costs over time. Additionally, increased competition in the solar industry can drive innovation and efficiency, leading to cost reductions.

While PERC cells may have a higher initial manufacturing cost, their improved efficiency and performance characteristics can contribute to a better overall cost of electricity generation over the lifetime of a solar panel system, especially in applications where space is limited or where higher efficiency is crucial.

Technical Difficulty 

In line with the International Technology Roadmap for Photovoltaics (ITRPV), the trend toward thinner wafers in solar cells has led to an increased adoption of rear-contact cell designs. This shift is driven by the challenges associated with front-to-rear interconnections and soldering, which can exert excessive stress on thin wafers. The three primary approaches to rear-contact cells, as outlined by the roadmap, are metal wrap-through (MWT), emitter wrap-through (EWT), and back-junction (BJ).

In MWT and EWT approaches, the emitter remains positioned at the front of the device. Laser-drilled holes through the wafer facilitate the transport of carriers to the rear, either through the metal contacts (MWT) or the emitter itself (EWT). The key distinction between MWT and EWT lies in the presence of grid lines on the front surface of MWT, whereas EWT lacks busbars but retains grid lines.

In contrast, a BJ cell situates the emitter at the rear surface, typically arranged in an interdigitated manner with the back surface field (BSF). BJ cells offer the advantage of allowing contacts to cover nearly the entire rear side, significantly reducing series resistance. All three approaches contribute to minimizing contact shading, with EWT and BJ types particularly effective in this regard.

Remarkable efficiencies have been achieved with these rear-contact cell designs, reaching 24.2% for BJ solar cells and exceeding 20% for both MWT and EWT cells. Additionally, interdigitated back contact silicon heterojunction cells (IBC-HIT) report efficiencies of 20.2%, with simulations suggesting the potential for efficiencies up to 26%. These advancements underscore the evolving landscape of solar cell technologies and their pursuit of higher efficiencies.