Understanding 156.75mm 5BB Solar Cells: Specifications and Applications
What Does 156.75mm 5BB Mean in Solar Technology?
In photovoltaic manufacturing, the designation 156.75mm 5BB refers to solar cells measuring 156.75×156.75mm with five busbars. These busbars (the thin silver lines) play a crucial role in electron collection efficiency - think of them as miniature highways for electrical current. Compared to older 3BB designs, the 5BB configuration reduces resistance losses by 18-22%, according to 2024 industry benchmarks.
Key Technical Specifications
- Dimensions: 156.75mm × 156.75mm (M6 wafer standard)
- Busbar configuration: 5BB (five parallel conductors)
- Conversion efficiency: 18.2%-19.2% for polycrystalline models
- Power output: 4.42W-4.57W per cell
- Thickness: 200μm ±20μm
Market Applications and Practical Uses
These workhorse cells power various solar solutions:
- Residential solar arrays: A typical 5kW system uses ~1,100 cells
- Commercial power stations: 1MW installation requires ~220,000 cells
- Specialty applications: Boat solar systems, RV power supplies
Fun fact: The 156.75mm dimension isn't random - it's precisely calculated to minimize silicon waste during diamond wire cutting. Imagine trying to fit maximum pizza slices from a circular wafer!
Pricing Dynamics (2024 Q2 Market Data)
| Order Quantity | Price per Cell | MOQ |
|---|---|---|
| 1-999 pcs | $0.45-$0.50 | 500 pcs |
| 1,000-5,000 pcs | $0.38-$0.42 | - |
| 10,000+ pcs | $0.32-$0.35 | - |
Performance Comparison: 5BB vs. Other Configurations
When testing under STC conditions (25°C, 1000W/m²):
- 5BB cells show 3.7% higher output than 3BB counterparts
- Power degradation after 25 years: <2.5% for premium grades
- Temperature coefficient: -0.35%/°C (better than thin-film alternatives)
Installation Considerations
When working with these cells:
- Use low-temperature soldering (<220°C) to prevent warping
- Maintain 2-3mm spacing between cells for thermal expansion
- Opt for UV-resistant EVA encapsulant (we've seen modules fail within 18 months using substandard materials)
Pro tip: Many DIY enthusiasts report success using second-life 5BB cells from decommissioned solar farms - just ensure they pass EL (electroluminescence) testing for microcracks.
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