Tongwei TWMNH-54HD505 505W Bifacial Solar Panel
Premium N-Type TOPCon Technology with Dual-Glass Construction
Maximum Solar Energy from Both Sides
The Tongwei TWMNH-54HD505 represents the future of solar energy technology. This premium bifacial panel doesn't just capture sunlight from the front - it generates additional power from reflected light hitting the back side, delivering 5-25% more energy than traditional monofacial panels. With industry-leading 22.7% efficiency and advanced N-Type TOPCon cell technology, you're investing in one of the most efficient and reliable solar solutions available today.
Whether you're a homeowner looking to maximize roof space, a business owner reducing energy costs, or a solar professional seeking the best performance for your clients, the Tongwei 505W bifacial panel delivers exceptional value. Manufactured by Tongwei Solar - a Tier 1 BloombergNEF-certified manufacturer - this panel combines cutting-edge technology with proven reliability, backed by a comprehensive 15-year product warranty and industry-leading 30-year linear performance warranty.
What makes this panel special? Advanced N-Type TOPCon cells perform better in real-world conditions than conventional PERC panels. With a superior temperature coefficient of just -0.28%/°C, this panel maintains higher output even on hot summer days. The dual-glass construction protects both active surfaces while providing enhanced durability for decades of reliable service. Plus, with 108 half-cut cells and 3 bypass diodes, you get better shade tolerance and reduced hot spot risk.
What is Bifacial Technology?
Traditional solar panels only generate power from the front surface. Bifacial panels have solar cells on both sides, capturing direct sunlight from the front AND reflected light from the ground, roofs, or nearby surfaces on the back. This means more energy from the same installation area.
Real-World Energy Gains:
- White gravel or sand surfaces: 25-40% additional energy
- Concrete installations: 15-25% energy boost
- Grass or green roofs: 10-15% extra power
- Standard asphalt: 5-10% performance improvement
Translation: A 505W front-side panel can produce 530-630W total power depending on installation conditions. That's like getting an extra panel for free!
For optimal bifacial performance, install panels with 1.0-1.5 meters ground clearance using elevated mounting structures. This allows reflected light to reach the rear surface effectively. Ground-mounted systems, commercial flat roofs, and carport installations are ideal applications.
Why N-Type TOPCon is Better
TOPCon stands for "Tunnel Oxide Passivated Contact" - a technology breakthrough that's replacing older PERC cells in premium solar panels. Think of it as the difference between a smartphone from 2015 and today's model: fundamentally better design that performs more efficiently.
Higher Efficiency
TOPCon cells achieve 22.7% efficiency compared to 19-21% for conventional PERC panels. That means more power per square meter - crucial when roof space is limited.
Better in Heat
Temperature coefficient of -0.28%/°C vs -0.34%/°C for PERC. In Spain's summer heat, TOPCon panels produce 2-3% more energy than PERC panels - that's thousands of euros over 30 years.
Less Degradation
N-Type cells have minimal light-induced degradation (LID) and superior PID resistance. Your panels maintain 98% power after year 1, then degrade only 0.45% annually - industry-leading performance.
Low-Light Performance
TOPCon technology excels in cloudy conditions and early morning/late evening. You generate power during more hours of the day compared to standard panels.
Complete Technical Specifications
Electrical Performance (STC Conditions)
STC = Standard Test Conditions: 1000W/m² irradiance, 25°C cell temperature, AM1.5 spectrum
Temperature Performance
Physical Specifications
Durability & Mechanical Load
How Much Energy Will This Panel Produce?
Energy production depends on your location, installation angle, and ground reflectivity. Here are realistic estimates for common scenarios:
Madrid, Spain
935 kWh/year
With 15% bifacial gain from white roof installation
Berlin, Germany
680 kWh/year
With 15% bifacial gain from ground-mount on gravel
Southern Spain
1060 kWh/year
Optimal ground-mount with 20% bifacial gain from sand
Example: 10kW System in Madrid
- 20 panels × 505W = 10,100W (10.1kW) system
- Annual production: ~18,700 kWh (with bifacial gain)
- Typical home consumption: 3,500-4,500 kWh/year
- Result: Powers 4+ homes or saves ~€2,500-3,000/year on electricity
Perfect For These Applications
Commercial Rooftops
Ideal for warehouses, factories, and commercial buildings with flat white roofs. The bifacial design maximizes reflected light from roof surfaces, delivering exceptional ROI.
Ground-Mounted Solar Farms
Achieve maximum bifacial gain with elevated mounting (1.0-1.5m clearance). Perfect for utility-scale projects on gravel, sand, or grass fields.
Carport Installations
Dual benefit: shaded parking plus solar generation. The elevated structure and concrete surfaces provide excellent bifacial performance while protecting vehicles.
Agrivoltaic Systems
Combine farming with solar generation. Elevated panels provide crop shade while capturing reflected light from soil and vegetation below.
Large Residential Installations
Homeowners with substantial roof space or ground area seeking maximum efficiency and long-term reliability with premium warranties.
Hot Climate Regions
Superior temperature coefficient means better summer performance. Spain, Portugal, southern France, Middle East, and Mediterranean regions especially benefit.
Installation Considerations
What's Included
- 1× Tongwei TWMNH-54HD505 505W bifacial solar panel
- Pre-installed MC4-EVO2 connectors (1200mm cables)
- IP68 waterproof junction box with 3 bypass diodes
- Product warranty certificate
- Installation and safety manual
What You'll Need Separately
- Mounting structure: Compatible with standard 54-cell panel rails (see our mounting systems)
- Solar inverter: Ensure input voltage range accommodates string configuration
- DC cables and connectors: MC4-compatible extension cables if needed
- Grounding equipment: As required by local electrical codes
- Installation: Certified solar installer recommended (2-person lift minimum)
Important: Mounting structures sold separately
This listing is for solar panels only. Browse our selection of compatible mounting structures designed for bifacial installations, or contact our team for personalized recommendations based on your installation type.
Electrical Configuration Tips
- String sizing: Typical 1500V system supports 10-13 panels per string
- Inverter sizing: Size inverter at 110-120% of array DC power to accommodate bifacial gain
- Orientation: South-facing (Northern Hemisphere) at 10-30° tilt optimal for bifacial gain
- Ground clearance: Maintain 1.0-1.5m for maximum rear-side light capture
Industry-Leading Warranty Protection
Product Warranty
Comprehensive coverage against manufacturing defects, material failures, and workmanship issues for 15 years.
Performance Warranty
Linear power output guarantee: 98% after year 1, then 0.45% annual degradation to 87.4% at year 30.
What This Means for You
After 30 years, your Tongwei panel is guaranteed to produce at least 87.4% of its original power - that's still 441W from a 505W panel. Compare this to typical 25-year warranties with 80% output, and you're getting significantly more energy over the system lifetime. This translates to thousands of euros in additional value.
Certifications & Standards
Design Qualification
Safety Qualification
European Conformity
German Quality Mark
PID Resistance
Quality Management
Frequently Asked Questions
What makes this panel better than standard PERC panels?
The Tongwei TWMNH-54HD505 uses advanced TOPCon N-Type cell technology, delivering 2-3% higher efficiency (22.7% vs 19-21%), superior temperature performance (-0.28%/°C vs -0.34%/°C), and minimal light-induced degradation. Combined with bifacial capability for 5-25% additional energy, you get significantly more power per panel - and more energy over 30 years.
Will the bifacial design work on my roof?
Bifacial panels work best with elevated mounting and light-colored or reflective surfaces below. White roofs, concrete, gravel, or metal roofing provide 10-25% energy gains. Standard dark shingle roofs will see 5-10% gains. Ground-mounted systems with proper clearance (1-1.5m) deliver maximum bifacial performance. Even without optimal conditions, you still get the excellent front-side efficiency of 505W.
How many panels do I need for my home or business?
This depends on your energy consumption and goals. A typical Spanish home consumes 3,500-4,500 kWh/year, requiring approximately 4-6 panels (2-3 kW system). For complete energy independence, plan for 8-12 panels (4-6 kW). Commercial buildings vary widely - contact our team with your annual kWh consumption for a personalized calculation.
Is this panel compatible with my existing solar inverter?
The Tongwei 505W panel is compatible with any inverter designed for 1500V systems. Check your inverter's specifications: MPP voltage range should include 30-36V, and input current should handle 16A minimum. String sizing typically allows 10-13 panels per string. When planning your system, consider inverter oversizing (110-120%) to accommodate the bifacial power gain.
How does the 30-year warranty work?
Tongwei provides two warranties: (1) 15-year product warranty covering manufacturing defects and materials, and (2) 30-year linear performance warranty guaranteeing 98% power output after year 1, then degrading by just 0.45% annually to 87.4% at year 30. This is backed by Tongwei Solar, a Tier 1 manufacturer with global presence and financial stability.
Can I install these panels myself?
While mechanically straightforward, solar installation requires electrical expertise and knowledge of local codes. We strongly recommend hiring a certified solar installer for safety and warranty compliance. Improper installation can void warranties and create electrical hazards. Many regions require licensed electricians for grid-connected solar systems. That said, these panels are DIY-friendly for off-grid systems if you have electrical experience.
How do these perform in hot climates like Spain or southern Europe?
Excellent question - this is where TOPCon technology shines! With a temperature coefficient of -0.28%/°C (vs -0.34% for PERC), these panels lose less power in heat. On a 50°C summer day in Spain, these panels produce 2-3% more energy than equivalent PERC panels. Over 30 years in hot climates, this adds up to thousands of euros in additional energy production. This is one of the key reasons to choose N-Type TOPCon over older PERC technology.
What maintenance do bifacial panels require?
Minimal maintenance - solar panels are largely self-sufficient. Clean the front surface 1-2 times yearly (more often in dusty areas) with water and soft brush. For bifacial installations, check rear surface annually and remove debris. Inspect cables, connectors, and mounting hardware yearly. The dual-glass construction and IP68 junction box make these panels highly durable with proper installation. Rain typically handles most cleaning naturally.
Are these panels safe in extreme weather (hail, snow, strong winds)?
Yes - these panels are certified for extreme conditions. They withstand 25mm hailstones at 23 m/s (82 km/h), snow loads up to 5400 Pa (equivalent to ~540kg/m²), and wind loads of 2400 Pa. The dual-glass construction and aluminum frame provide exceptional structural integrity. They're tested to IEC standards for salt mist corrosion, ammonia exposure, and temperature cycling from -40°C to +85°C. These panels are built to last decades in harsh environments.
Do you offer volume discounts for large projects?
Absolutely! We offer competitive volume pricing for projects requiring 100+ panels. Whether you're a solar installer, developer, or managing a large commercial/agricultural installation, contact our sales team for project-specific quotes. We can also provide technical support for system design, logistics coordination, and installation guidance for bulk orders.
Tongwei 505W vs. Alternatives
| Feature | Tongwei 505W TOPCon | Standard 450W PERC | Monofacial 500W |
|---|---|---|---|
| Power Output | 505W + 5-25% bifacial | 450W | 500W |
| Efficiency | 22.7% | 19-20% | 22% |
| Temperature Coefficient | -0.28%/°C | -0.34%/°C | -0.30%/°C |
| Performance Warranty | 30 years linear | 25 years | 25 years |
| Year 30 Output | 87.4% (441W) | 80% (360W) | 83% (415W) |
| LID (Light Degradation) | Minimal (<1%) | 2-3% | 1-2% |
| 30-Year Energy Production | Highest (up to 30% more) | Baseline | 15% more than PERC |
Bottom Line
The Tongwei 505W bifacial TOPCon panel delivers 20-30% more total energy over 30 years compared to conventional 450W PERC panels, despite being only slightly more expensive upfront. Better efficiency, superior temperature performance, bifacial gain, and longer warranty mean significantly lower LCOE (Levelized Cost of Energy) - making this the smart long-term investment.
Why Choose Tongwei Solar?
Tongwei Solar is a globally recognized Tier 1 manufacturer with over 20GW annual production capacity. As one of the world's top 5 solar panel manufacturers, Tongwei combines cutting-edge R&D with rigorous quality control and financial stability - essential factors when investing in a 30-year solar system.
Tier 1 Bankability
BloombergNEF Tier 1 certified - recognized by banks and financial institutions worldwide for reliability and warranty backing. Your 30-year investment is protected.
Advanced R&D
Industry leader in TOPCon N-Type technology development. Tongwei continuously invests in next-generation solar cell research, ensuring you get proven, cutting-edge technology.
Global Presence
Manufacturing facilities in China, Thailand, and Vietnam with ISO 9001, ISO 14001, and ISO 45001 certifications. Global distribution network ensures support availability.
Quality Assurance
Rigorous testing including PID resistance, salt mist corrosion, ammonia exposure, hail impact, and thermal cycling. Every panel meets international IEC standards.
Ready to Maximize Your Solar Investment?
Join thousands of homeowners and businesses across Europe who've chosen Tongwei's premium bifacial technology for maximum energy production and long-term reliability. With 30-year warranties and industry-leading efficiency, this is solar done right.
Need help choosing the right system size?
Our solar experts are available for free consultation
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Technical Documentation
SKU: SOL0672 | Brand: Tongwei Solar | Model: TWMNH-54HD505 | Power: 505W | Technology: N-Type TOPCon Bifacial
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