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BC Back Solar Modules High-Efficiency Aesthetic Rooftop Solution
Sungold Solar BC (Back Contact) all-black modules combine a clean front design with higher effective light-collection potential—delivering stronger energy density per square meter and a premium all-black look that fits modern rooftops and design-driven projects.
Why Back-Contact (BC)?
BC (Back Contact) technology moves the electrical contacts and conductors from the cell’s front to the back. By reducing front-side metal shading, the module achieves:
A cleaner all-black appearance with better visual consistency
Higher effective light collection potential, helping maximize energy density on limited roof area
This makes BC especially suitable for premium residential rooftops, urban rooftops, and projects where aesthetics and performance both matter.
Safer Performance Under Partial Shading
ooftops commonly experience “fragmented shading” from trees, parapets, HVAC units, rails, and nearby structures. Shading doesn’t just reduce energy yield—it can also create localized heating and hotspot risk.
Sungold Solar uses a multi-path current-routing structure on the back side to improve current distribution under partial shading, reducing heat concentration at the source and strengthening operational safety and reliability.
Hotspot temperature reduced by ~70°C
When local shading occurs, current can be redistributed through adjacent regions, helping prevent heat buildup and localized overheating.
Zero hotspot breakdown record
Stable performance in extreme shading tests, meeting stricter safety and reliability expectations.
Anti-Microcrack Interconnection
Microcracks can form during transportation, installation stress, long-term thermal expansion/contraction, and structural vibration. These cracks often lead to hidden degradation over time.
Sungold Solar adopts a unique rear-side “straight-line” ribbon design, which reduces stress concentration compared with traditional “Z-shaped” ribbon layouts. This improves microcrack resistance and helps maintain more stable long-term power performance.
Product Specifications
| Model | PA219-BC-110W | PA219-BC-450W | PA621-BC-105W | PA621-BC-200W | SGM2-BC-115W | SGM2-BC-460W | BXF PLUS-BC-2x55W | BXF PLUS-BC-4x55W | BXF-BC-4x110W |
|---|---|---|---|---|---|---|---|---|---|
| Open Circuit Voltage | 21.7V | 43.5V | 21.5V | 20.08V | 21.7V | 43.5V | 21.53V | 43.1V | 43.1V |
| Operating Voltage | 18.9V | 37.8V | 19.0V | 17.78V | 18.9V | 37.8V | 19.05V | 38.1V | 38.1V |
| Short Circuit Current | 5.99A | 12.26A | 5.80A | 11.81A | 6.27A | 12.53A | 6.06A | 6.06A | 12.13A |
| Operating Current | 5.82A | 11.91A | 5.53A | 11.25A | 6.09A | 12.17A | 5.78A | 5.78A | 11.55A |
| Max System Voltage | 1000V DC | 1000V DC | 1000V DC | 200V DC | |||||
| Cell Type | BC Solar Cells | ||||||||
| Cell Efficiency | 25% | ||||||||
| Warranty | 6 Years | 10 Years | 10 Years | 3 Years | |||||
| Color | White/Black | White/Black | Black | Black | White/Black | White/Black | Black | Black | Black |
| Weight | 2.0KG | 7.5KG | 3.7KG | 6.4KG | 5.3KG | 20.4KG | 2.4KG | 4.55KG | 8.6KG |
| Expand Size (mm) | 1030*595*3 | 1639*610*3 | 1090*622*12 | 1460*807*12 | 1010*580*30 | 1980*1134*30 | 1150*600*3 | 2154*600*3 | 2520*970*3 |
| Folded Size (mm) | - | - | - | - | - | - | 575*600*40 | 575*600*45 | 970*670*50 |
| Output Interface | MC4 | - | MC4 | Anderson | |||||
| Remarks | SUNGOLD Offer Customize Service, Please Refer To Our Website Or Ask SUNGOLD Workers For More Sizes And The Latest Parameters. | ||||||||
Recommended Applications
Urban Rooftops / Premium Residential
Limited area, frequent shading, and high aesthetic expectations—BC’s all-black uniformity fits perfectly.
BIPV-Style Projects / Carports
A cleaner, more “building-material” look helps reduce visual disruption while maintaining strong generation potential.
Multi-Pitch or Multi-Orientation Roofs
When daily productive hours and low-light performance matter, BC supports practical yield optimization.
Premium RV / Marine / Lightweight Systems
For users who want a refined appearance and higher energy density, BC aesthetics and performance make a strong match.
Sungold Solar BC Product Lineup
BC All-Black Single-Glass Modules
Designed for residential and C&I rooftops where all-black aesthetics and energy density matter.
BC Lightweight Integration Solutions
For curved or weight-sensitive roofs and mobile applications—built for easier integration and deployment.
BC Folding Integrated Solutions
For portable power and emergency use—focused on practical generation performance across varying light conditions.
Frequently Asked Questions
Why Do BC Modules Look "More Black"?
Because the contacts and conductors are on the rear side, the front surface looks cleaner and more uniform.
Is BC Only About Aesthetics?
No. The clean front also reduces shading loss from front gridlines and is often preferred for rooftops where total yield under real conditions matters.
Why Highlight Low-Light Practicality?
Because rooftops experience morning/evening and cloudy conditions. Better low-light behavior supports longer productive hours and more stable daily yield.
Why Does Temperature Coefficient Matter?
Higher temperature reduces PV output. A better temperature coefficient means less power drop in summer—especially important on hot roofs.
How Should I Choose Between TOPCon And BC?
Choose based on your project goal: TOPCon for mainstream scale; BC for rooftop energy density + aesthetics + performance under shading constraints.
Is BC More Expensive—And Is It Worth It?
Value depends on roof area limits, shading, appearance requirements, and yield goals. For "High-Value Rooftops," BC advantages are easier to justify.
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