LONGi Hi-MO X6 445W vs Meyer Burger White 400W
The Meyer Burger White 400W wins this comparison by a decisive margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Meyer Burger White 400W is the stronger choice.
Key Differences
- • LONGi Hi-MO X6 445W is rated at 445W while Meyer Burger White 400W is rated at 400W, a 45W difference.
- • LONGi Hi-MO X6 445W achieves 22% efficiency vs 21.7% for the other, a 0.3 percentage point gap.
- • Meyer Burger White 400W comes with a 25-year product warranty vs 12 years for the other.
- • Meyer Burger White 400W has a superior temperature coefficient of -0.26%/°C vs -0.29%/°C, retaining more power in hot climates.
- • LONGi Hi-MO X6 445W uses TOPCon N-type cells while Meyer Burger White 400W uses HJT (Heterojunction) N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO X6 445W achieves 22% module efficiency compared to Meyer Burger White 400W's 21.7%, meaning LONGi Hi-MO X6 445W converts 0.3 percentage points more sunlight into electricity per square meter. In practical terms, the LONGi Hi-MO X6 445W produces 227.9 watts per square meter of panel area while the Meyer Burger White 400W produces 204.8 W/m². For rooftop installations where space is limited, this efficiency gap determines how many kilowatts you can fit on your available roof area. Over a 25-year system life, even a small efficiency advantage compounds into meaningful additional energy production.
Power Output
The LONGi Hi-MO X6 445W delivers 445W per panel versus 400W for the Meyer Burger White 400W, a 45W difference per module. To build an 8 kW residential system, you would need 18 LONGi Hi-MO X6 445W panels or 20 Meyer Burger White 400W panels. Choosing the higher-wattage option saves 2 panels, reducing total racking hardware, wiring, and installation labor costs. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
The Meyer Burger White 400W has a temperature coefficient of -0.26%/°C versus -0.29%/°C for the LONGi Hi-MO X6 445W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Meyer Burger White 400W retains 94.8% of its rated power while the other retains 94.2%. While the numerical gap is modest, it still accumulates over decades of summer production, especially in southern latitudes with prolonged peak heat hours.
Warranty Coverage
The LONGi Hi-MO X6 445W is backed by a 12-year product warranty and 25-year performance guarantee, while the Meyer Burger White 400W offers 25-year product and 30-year performance coverage. The Meyer Burger White 400W provides 13 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1% first year then 0.4%/year for LONGi Hi-MO X6 445W; 1% first year then 0.25%/year for Meyer Burger White 400W), after 25 years the LONGi Hi-MO X6 445W should retain approximately 89.4% of original output versus 93.0% for the Meyer Burger White 400W. This 3.6 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The LONGi Hi-MO X6 445W measures 1722×1134×30mm and weighs 21.5 kg, while the Meyer Burger White 400W measures 1722×1134×35mm at 21 kg. 1.95 m² of panel area for the LONGi Hi-MO X6 445W versus 1.95 m² for the Meyer Burger White 400W. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | LONGi Hi-MO X6 445W | Meyer Burger White 400W |
|---|---|---|
| Power | 445W | 400W |
| Efficiency | 22% | 21.7% |
| Power Density | 21.2 W/sq ft | 19.0 W/sq ft |
| Cell Type | TOPCon N-type | HJT (Heterojunction) N-type |
| Bifacial | Yes | No |
| Weight | 21.5 kg | 21 kg |
| Temp Coefficient | -0.29%/°C | -0.26%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.25% |
| Country | China | Germany |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: LONGi Hi-MO X6 445WThe LONGi Hi-MO X6 445W achieves 22% efficiency versus 21.7% — a 0.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.4 kW more total system capacity, or 7 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Meyer Burger White 400WThe Meyer Burger White 400W has a better temperature coefficient of -0.26%/°C versus -0.29%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 94.2%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: Meyer Burger White 400WMeyer Burger White 400W leads with a 25-year product warranty versus 12 years. Meyer Burger White 400W degrades more slowly at 0.25% per year versus 0.4%. After 25 years, expect 89.4% vs 93.0% of original output for LONGi Hi-MO X6 445W and Meyer Burger White 400W respectively.
4. Power Output
Winner: LONGi Hi-MO X6 445WThe LONGi Hi-MO X6 445W delivers 445W versus 400W per panel — 45W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 20 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Meyer Burger White 400WThe LONGi Hi-MO X6 445W uses TOPCon N-type: TOPCon (Tunnel Oxide Passivated Contact) adds a thin tunnel oxide layer to reduce recombination losses, achieving higher efficiency than PERC while being manufacturable on existing production lines. The Meyer Burger White 400W uses HJT (Heterojunction) N-type: HJT (Heterojunction) combines crystalline silicon with amorphous silicon layers, delivering the best temperature coefficient and bifacial gains, but at higher manufacturing cost. HJT (Heterojunction) N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
LONGi Hi-MO X6 445W
The Hi-MO X6 is LONGi's TOPCon N-type line offering 445W in a compact format, well-suited for space-constrained residential rooftops.
Pros
- + Compact size for residential roofs
- + Good N-type TOPCon efficiency
- + Advanced technology
- + Budget-friendly
Cons
- - Lower wattage than larger models
- - Mid-range efficiency for N-type
- - Less suited for very large roofs
Meyer Burger White 400W
The Meyer Burger White 400W is a premium heterojunction (HJT) panel manufactured in Germany, featuring an industry-leading -0.26%/°C temperature coefficient that delivers superior energy yield in hot climates. The HJT cell architecture provides excellent low-light performance and bifacial-ready construction. Meyer Burger's 25-year product warranty and 30-year performance guarantee (92% at year 30) reflect confidence in their proprietary SmartWire Connection Technology (SWCT). A premium European-manufactured alternative to Asian-produced panels.
Pros
- + Industry-leading -0.26%/°C temperature coefficient — best-in-class hot climate performance
- + Made in Germany with European quality standards
- + 25-year product warranty — among the longest in the industry
- + 30-year performance warranty with only 0.25% annual degradation
- + HJT technology delivers excellent low-light and cloudy day performance
- + Bifacial-ready construction for additional energy gain
Cons
- - Premium pricing — $0.50-$0.60/W vs $0.25-$0.35/W for mainstream panels
- - 400W output is modest by current standards
- - Limited US distribution and installer familiarity
- - Meyer Burger has faced financial challenges affecting supply stability
Choose LONGi Hi-MO X6 445W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Homeowners wanting N-type TOPCon technology in a compact residential format.
Choose Meyer Burger White 400W If...
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 25+ years
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You want maximum output retention over the system's 25-30 year lifespan
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Quality-focused homeowners in hot climates who want European-manufactured HJT panels with the best temperature performance and longest warranties available.
Our Recommendation
The Meyer Burger White 400W is the decisive winner in this solar panel comparison, outperforming the LONGi Hi-MO X6 445W in 3 of 5 dimensions. Unless you have a specific requirement that the LONGi Hi-MO X6 445W uniquely addresses, the Meyer Burger White 400W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, LONGi Hi-MO X6 445W or Meyer Burger White 400W?
The Meyer Burger White 400W wins this comparison by a decisive margin. It offers better long-term durability with 25-year warranty. For most residential installations, the Meyer Burger White 400W is the stronger choice.
Which panel is more efficient, LONGi Hi-MO X6 445W or Meyer Burger White 400W?
The LONGi Hi-MO X6 445W at 22% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.3 percentage points translates to approximately 45W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO X6 445W or Meyer Burger White 400W?
The LONGi Hi-MO X6 445W comes with a 12-year product warranty and 25-year performance guarantee. The Meyer Burger White 400W offers 25-year product and 30-year performance warranties. Meyer Burger White 400W provides 13 additional years of product coverage.
Which panel performs better in hot weather?
The LONGi Hi-MO X6 445W has a temperature coefficient of -0.29%/°C and the Meyer Burger White 400W is -0.26%/°C. Meyer Burger White 400W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many LONGi Hi-MO X6 445W vs Meyer Burger White 400W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 LONGi Hi-MO X6 445W panels (445W each) or 20 Meyer Burger White 400W panels (400W each). The LONGi Hi-MO X6 445W requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026