First Solar Series 6 Plus 465W vs LONGi Hi-MO 6 Artist 440W
The LONGi Hi-MO 6 Artist 440W wins this comparison by a clear margin. It leads in efficiency (22% vs 19.2%) and matches or exceeds on warranty (12 vs 10 years). For most residential installations, the LONGi Hi-MO 6 Artist 440W is the stronger choice.
Key Differences
- • First Solar Series 6 Plus 465W is rated at 465W while LONGi Hi-MO 6 Artist 440W is rated at 440W, a 25W difference.
- • LONGi Hi-MO 6 Artist 440W achieves 22% efficiency vs 19.2% for the other, a 2.8 percentage point gap.
- • LONGi Hi-MO 6 Artist 440W comes with a 12-year product warranty vs 10 years for the other.
- • First Solar Series 6 Plus 465W has a superior temperature coefficient of -0.28%/°C vs -0.34%/°C, retaining more power in hot climates.
- • First Solar Series 6 Plus 465W uses CdTe (Cadmium Telluride) cells while LONGi Hi-MO 6 Artist 440W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO 6 Artist 440W achieves 22% module efficiency compared to First Solar Series 6 Plus 465W's 19.2%, meaning LONGi Hi-MO 6 Artist 440W converts 2.8 percentage points more sunlight into electricity per square meter. In practical terms, the First Solar Series 6 Plus 465W produces 187.9 watts per square meter of panel area while the LONGi Hi-MO 6 Artist 440W produces 225.3 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 First Solar Series 6 Plus 465W delivers 465W per panel versus 440W for the LONGi Hi-MO 6 Artist 440W, a 25W difference per module. To build an 8 kW residential system, you would need 18 First Solar Series 6 Plus 465W panels or 19 LONGi Hi-MO 6 Artist 440W panels. Choosing the higher-wattage option saves 1 panel, 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 First Solar Series 6 Plus 465W has a temperature coefficient of -0.28%/°C versus -0.34%/°C for the LONGi Hi-MO 6 Artist 440W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the First Solar Series 6 Plus 465W retains 94.4% of its rated power while the other retains 93.2%. This difference is particularly significant in hot climates such as the American Southwest, the Middle East, and Southeast Asia, where panels routinely operate 30-40°C above STC for several hours each day. Over the system lifetime, the cumulative energy advantage from a better temperature coefficient can amount to 2-4% of total production.
Warranty Coverage
The First Solar Series 6 Plus 465W is backed by a 10-year product warranty and 30-year performance guarantee, while the LONGi Hi-MO 6 Artist 440W offers 12-year product and 25-year performance coverage. The LONGi Hi-MO 6 Artist 440W provides 2 additional years of defect protection, covering manufacturing issues, material failures, and premature performance loss. Based on their published degradation rates (1.5% first year then 0.5%/year for First Solar Series 6 Plus 465W; 1.5% first year then 0.5%/year for LONGi Hi-MO 6 Artist 440W), after 25 years the First Solar Series 6 Plus 465W should retain approximately 86.5% of original output versus 86.5% for the LONGi Hi-MO 6 Artist 440W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The First Solar Series 6 Plus 465W measures 2009×1232×49mm and weighs 34.5 kg, while the LONGi Hi-MO 6 Artist 440W measures 1722×1134×30mm at 21 kg. 2.48 m² of panel area for the First Solar Series 6 Plus 465W versus 1.95 m² for the LONGi Hi-MO 6 Artist 440W. The LONGi Hi-MO 6 Artist 440W is 13.5 kg lighter per panel, which reduces structural load requirements on the roof and makes handling easier during installation. For a 20-panel system, that is a total weight difference of 270 kg. The more compact LONGi Hi-MO 6 Artist 440W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | First Solar Series 6 Plus 465W | LONGi Hi-MO 6 Artist 440W |
|---|---|---|
| Power | 465W | 440W |
| Efficiency | 19.2% | 22% |
| Power Density | 17.5 W/sq ft | 20.9 W/sq ft |
| Cell Type | CdTe (Cadmium Telluride) | PERC Mono |
| Bifacial | No | No |
| Weight | 34.5 kg | 21 kg |
| Temp Coefficient | -0.28%/°C | -0.34%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 4000 Pa | 2400 Pa |
| Product Warranty | 10 years | 12 years |
| Performance Warranty | 30 years | 25 years |
| Degradation (Year 1) | 1.5% | 1.5% |
| Annual Degradation | 0.5% | 0.5% |
| Country | United States | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: LONGi Hi-MO 6 Artist 440WThe LONGi Hi-MO 6 Artist 440W achieves 22% efficiency versus 19.2% — a 2.8 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.8 kW more total system capacity, or 4 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: First Solar Series 6 Plus 465WThe First Solar Series 6 Plus 465W has a better temperature coefficient of -0.28%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.4% of rated power versus 93.2%. This is a meaningful difference in hot states like Arizona, Texas, and Florida.
3. Durability & Warranty
Winner: LONGi Hi-MO 6 Artist 440WLONGi Hi-MO 6 Artist 440W leads with a 12-year product warranty versus 10 years. After 25 years, expect 86.5% vs 86.5% of original output for First Solar Series 6 Plus 465W and LONGi Hi-MO 6 Artist 440W respectively.
4. Power Output
Winner: First Solar Series 6 Plus 465WThe First Solar Series 6 Plus 465W delivers 465W versus 440W per panel — 25W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 19 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: First Solar Series 6 Plus 465WThe First Solar Series 6 Plus 465W uses CdTe (Cadmium Telluride): CdTe (Cadmium Telluride). The LONGi Hi-MO 6 Artist 440W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. CdTe (Cadmium Telluride) represents a newer generation technology with a longer performance runway as manufacturing matures.
First Solar Series 6 Plus 465W
The Series 6 Plus delivers 465W using First Solar's proven CdTe thin-film technology, manufactured in the United States.
Pros
- + Proven US thin-film technology
- + Excellent temperature coefficient
- + Environmentally responsible
- + Strong bankability
Cons
- - Lower efficiency
- - Very heavy panel
- - Not suitable for residential
LONGi Hi-MO 6 Artist 440W
LONGi Hi-MO 6 Artist is an all-black PERC panel delivering 440W with clean all-black aesthetic design for appearance-conscious homeowners.
Pros
- + All-black aesthetics
- + Good PERC efficiency
- + Lightweight
- + LONGi brand quality
Cons
- - All-black reduces cooling
- - Standard PERC technology
- - Higher cost than silver-frame
Choose First Solar Series 6 Plus 465W If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ Large commercial and utility projects wanting proven US thin-film technology.
Choose LONGi Hi-MO 6 Artist 440W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ Long-term warranty protection is a top priority and you plan to stay in your home for 12+ years
- ✓ Homeowners prioritizing curb appeal with all-black panel aesthetics.
Our Recommendation
We recommend the LONGi Hi-MO 6 Artist 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 First Solar Series 6 Plus 465W remains a good product, but the LONGi Hi-MO 6 Artist 440W delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, First Solar Series 6 Plus 465W or LONGi Hi-MO 6 Artist 440W?
The LONGi Hi-MO 6 Artist 440W wins this comparison by a clear margin. It leads in efficiency (22% vs 19.2%) and matches or exceeds on warranty (12 vs 10 years). For most residential installations, the LONGi Hi-MO 6 Artist 440W is the stronger choice.
Which panel is more efficient, First Solar Series 6 Plus 465W or LONGi Hi-MO 6 Artist 440W?
The LONGi Hi-MO 6 Artist 440W 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 2.8 percentage points translates to approximately 25W per panel under standard test conditions.
Which has a better warranty, First Solar Series 6 Plus 465W or LONGi Hi-MO 6 Artist 440W?
The First Solar Series 6 Plus 465W comes with a 10-year product warranty and 30-year performance guarantee. The LONGi Hi-MO 6 Artist 440W offers 12-year product and 25-year performance warranties. LONGi Hi-MO 6 Artist 440W provides 2 additional years of product coverage.
Which panel performs better in hot weather?
The First Solar Series 6 Plus 465W has a temperature coefficient of -0.28%/°C and the LONGi Hi-MO 6 Artist 440W is -0.34%/°C. First Solar Series 6 Plus 465W retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many First Solar Series 6 Plus 465W vs LONGi Hi-MO 6 Artist 440W panels do I need for an 8 kW system?
For an 8 kW system: you need 18 First Solar Series 6 Plus 465W panels (465W each) or 19 LONGi Hi-MO 6 Artist 440W panels (440W each). The First Solar Series 6 Plus 465W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026