Maxeon Maxeon 6 AC 440W vs Meyer Burger Glass 390W
The Maxeon Maxeon 6 AC 440W wins this comparison by a clear margin. It leads in efficiency (22.5% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Maxeon Maxeon 6 AC 440W is the stronger choice.
Key Differences
- • Maxeon Maxeon 6 AC 440W is rated at 440W while Meyer Burger Glass 390W is rated at 390W, a 50W difference.
- • Maxeon Maxeon 6 AC 440W achieves 22.5% efficiency vs 21.2% for the other, a 1.3 percentage point gap.
- • Both carry matching 25-year product warranties.
- • Meyer Burger Glass 390W has a superior temperature coefficient of -0.26%/°C vs -0.27%/°C, retaining more power in hot climates.
- • Maxeon Maxeon 6 AC 440W uses IBC (Interdigitated Back Contact) cells while Meyer Burger Glass 390W uses HJT (Heterojunction) N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Maxeon Maxeon 6 AC 440W achieves 22.5% module efficiency compared to Meyer Burger Glass 390W's 21.2%, meaning Maxeon Maxeon 6 AC 440W converts 1.3 percentage points more sunlight into electricity per square meter. In practical terms, the Maxeon Maxeon 6 AC 440W produces 203.5 watts per square meter of panel area while the Meyer Burger Glass 390W produces 199.7 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 Maxeon Maxeon 6 AC 440W delivers 440W per panel versus 390W for the Meyer Burger Glass 390W, a 50W difference per module. To build an 8 kW residential system, you would need 19 Maxeon Maxeon 6 AC 440W panels or 21 Meyer Burger Glass 390W 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 Glass 390W has a temperature coefficient of -0.26%/°C versus -0.27%/°C for the Maxeon Maxeon 6 AC 440W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Meyer Burger Glass 390W retains 94.8% of its rated power while the other retains 94.6%. 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 Maxeon Maxeon 6 AC 440W is backed by a 25-year product warranty and 25-year performance guarantee, while the Meyer Burger Glass 390W offers 25-year product and 30-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (0.25% first year then 0.25%/year for Maxeon Maxeon 6 AC 440W; 1% first year then 0.25%/year for Meyer Burger Glass 390W), after 25 years the Maxeon Maxeon 6 AC 440W should retain approximately 93.8% of original output versus 93.0% for the Meyer Burger Glass 390W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Maxeon Maxeon 6 AC 440W measures 2067×1046×30mm and weighs 22 kg, while the Meyer Burger Glass 390W measures 1722×1134×35mm at 22.5 kg. 2.16 m² of panel area for the Maxeon Maxeon 6 AC 440W versus 1.95 m² for the Meyer Burger Glass 390W. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. The more compact Meyer Burger Glass 390W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Maxeon Maxeon 6 AC 440W | Meyer Burger Glass 390W |
|---|---|---|
| Power | 440W | 390W |
| Efficiency | 22.5% | 21.2% |
| Power Density | 18.9 W/sq ft | 18.6 W/sq ft |
| Cell Type | IBC (Interdigitated Back Contact) | HJT (Heterojunction) N-type |
| Bifacial | Yes | No |
| Weight | 22 kg | 22.5 kg |
| Temp Coefficient | -0.27%/°C | -0.26%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 3600 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 30 years |
| Degradation (Year 1) | 0.25% | 1% |
| Annual Degradation | 0.25% | 0.25% |
| Country | Malaysia | Germany |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Maxeon Maxeon 6 AC 440WThe Maxeon Maxeon 6 AC 440W achieves 22.5% efficiency versus 21.2% — a 1.3 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 1.5 kW more total system capacity, or 7 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Meyer Burger Glass 390WThe Meyer Burger Glass 390W has a better temperature coefficient of -0.26%/°C versus -0.27%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.8% of rated power versus 94.6%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: TieBoth panels offer identical 25-year product warranties and 0.25% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Maxeon Maxeon 6 AC 440WThe Maxeon Maxeon 6 AC 440W delivers 440W versus 390W per panel — 50W more. For an 8 kW system, you need 19 panels with the higher-wattage option versus 21 panels, saving 2 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe Maxeon Maxeon 6 AC 440W uses IBC (Interdigitated Back Contact): IBC (Interdigitated Back Contact) moves all electrical contacts to the rear of the cell, maximizing front-side light capture for the highest possible efficiency. The Meyer Burger Glass 390W 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. Both are equivalent-generation technologies.
Maxeon Maxeon 6 AC 440W
The Maxeon 6 AC 440W is designed for commercial applications, delivering 440W with IBC technology in a commercial form factor with integrated microinverter option.
Pros
- + IBC technology for commercial use
- + Strong 22.5% efficiency
- + Low degradation
- + Excellent shade tolerance
Cons
- - Commercial pricing
- - Larger form factor
- - Limited residential application
Meyer Burger Glass 390W
The Meyer Burger Glass 390W is the all-black aesthetic variant of Meyer Burger's premium HJT panel line, featuring a glass-glass construction for enhanced durability and fire resistance. The all-black appearance (black frame, black backsheet) makes it ideal for residential installations where aesthetics matter. It shares the same industry-leading -0.26%/°C temperature coefficient and SmartWire Connection Technology as the White series, with the glass-glass build adding mechanical strength and improved PID resistance.
Pros
- + Sleek all-black aesthetics for residential curb appeal
- + Glass-glass construction for enhanced durability and fire resistance
- + -0.26%/°C temperature coefficient — same industry-leading thermal performance
- + Made in Germany with 25+30 year warranty coverage
- + Improved PID resistance from glass-glass construction
- + HJT cells deliver excellent low-light performance
Cons
- - 390W slightly lower output than White variant due to all-black design
- - Glass-glass construction adds 1.5 kg weight per panel
- - Higher price premium for aesthetic all-black finish
- - Limited US availability and installer network
Choose Maxeon Maxeon 6 AC 440W 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
- ✓ Commercial rooftop installations seeking premium IBC performance.
Choose Meyer Burger Glass 390W If...
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Aesthetic-conscious homeowners who want premium European-made HJT panels with an all-black look and glass-glass durability for visible roof installations.
Our Recommendation
We recommend the Maxeon Maxeon 6 AC 440W for most buyers in this comparison. It wins 2 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Meyer Burger Glass 390W remains a good product, but the Maxeon Maxeon 6 AC 440W delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Maxeon Maxeon 6 AC 440W or Meyer Burger Glass 390W?
The Maxeon Maxeon 6 AC 440W wins this comparison by a clear margin. It leads in efficiency (22.5% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Maxeon Maxeon 6 AC 440W is the stronger choice.
Which panel is more efficient, Maxeon Maxeon 6 AC 440W or Meyer Burger Glass 390W?
The Maxeon Maxeon 6 AC 440W at 22.5% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.3 percentage points translates to approximately 50W per panel under standard test conditions.
Which has a better warranty, Maxeon Maxeon 6 AC 440W or Meyer Burger Glass 390W?
The Maxeon Maxeon 6 AC 440W comes with a 25-year product warranty and 25-year performance guarantee. The Meyer Burger Glass 390W offers 25-year product and 30-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Maxeon Maxeon 6 AC 440W has a temperature coefficient of -0.27%/°C and the Meyer Burger Glass 390W is -0.26%/°C. Meyer Burger Glass 390W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Maxeon Maxeon 6 AC 440W vs Meyer Burger Glass 390W panels do I need for an 8 kW system?
For an 8 kW system: you need 19 Maxeon Maxeon 6 AC 440W panels (440W each) or 21 Meyer Burger Glass 390W panels (390W each). The Maxeon Maxeon 6 AC 440W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026