LONGi Hi-MO 6 Artist 440W vs Waaree WS-440
The Waaree WS-440 wins this comparison by a clear margin. It offers better long-term durability with 12-year warranty. For most residential installations, the Waaree WS-440 is the stronger choice.
Key Differences
- • Both panels are rated at 440W, so the comparison comes down to efficiency, warranty, and technology.
- • LONGi Hi-MO 6 Artist 440W achieves 22% efficiency vs 21.8% for the other, a 0.2 percentage point gap.
- • Both carry matching 12-year product warranties.
- • Waaree WS-440 has a superior temperature coefficient of -0.3%/°C vs -0.34%/°C, retaining more power in hot climates.
- • LONGi Hi-MO 6 Artist 440W uses PERC Mono cells while Waaree WS-440 uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO 6 Artist 440W achieves 22% module efficiency compared to Waaree WS-440's 21.8%, meaning LONGi Hi-MO 6 Artist 440W converts 0.2 percentage points more sunlight into electricity per square meter. In practical terms, the LONGi Hi-MO 6 Artist 440W produces 225.3 watts per square meter of panel area while the Waaree WS-440 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
Both panels are rated at 440W under standard test conditions (STC), requiring 19 panels each to build an 8 kW system. With identical wattage ratings, the power output dimension is a draw and does not favor either panel. The real differentiators become efficiency density, temperature behavior, and long-term degradation rates which determine actual field performance beyond the nameplate rating.
Temperature Coefficient
The Waaree WS-440 has a temperature coefficient of -0.3%/°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 Waaree WS-440 retains 94.0% of its rated power while the other retains 93.2%. 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 6 Artist 440W is backed by a 12-year product warranty and 25-year performance guarantee, while the Waaree WS-440 offers 12-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1.5% first year then 0.5%/year for LONGi Hi-MO 6 Artist 440W; 1% first year then 0.4%/year for Waaree WS-440), after 25 years the LONGi Hi-MO 6 Artist 440W should retain approximately 86.5% of original output versus 89.4% for the Waaree WS-440. This 2.9 percentage point gap in end-of-life output meaningfully impacts lifetime energy economics.
Physical Dimensions & Weight
The LONGi Hi-MO 6 Artist 440W measures 1722×1134×30mm and weighs 21 kg, while the Waaree WS-440 measures 1722×1134×30mm at 21.5 kg. 1.95 m² of panel area for the LONGi Hi-MO 6 Artist 440W versus 1.95 m² for the Waaree WS-440. 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 6 Artist 440W | Waaree WS-440 |
|---|---|---|
| Power | 440W | 440W |
| Efficiency | 22% | 21.8% |
| Power Density | 20.9 W/sq ft | 20.9 W/sq ft |
| Cell Type | PERC Mono | TOPCon N-type |
| Bifacial | No | No |
| Weight | 21 kg | 21.5 kg |
| Temp Coefficient | -0.34%/°C | -0.3%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 12 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1.5% | 1% |
| Annual Degradation | 0.5% | 0.4% |
| Country | China | India |
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 21.8% — a 0.2 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.0 kW more total system capacity, or 0 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Waaree WS-440The Waaree WS-440 has a better temperature coefficient of -0.3%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.0% of rated power versus 93.2%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: Waaree WS-440Waaree WS-440 degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 86.5% vs 89.4% of original output for LONGi Hi-MO 6 Artist 440W and Waaree WS-440 respectively.
4. Power Output
Winner: TieBoth panels deliver 440W — identical power output per panel. System cost per watt will be the deciding factor.
5. Cell Technology
Winner: Waaree WS-440The 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. The Waaree WS-440 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. TOPCon N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
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
Waaree WS-440
The Waaree WS-440 is a 440W residential-format TOPCon N-type panel in the standard 108-cell configuration, manufactured at Waaree's state-of-the-art facilities in Gujarat, India. At 21.8% efficiency, it competes directly with Chinese TOPCon panels while offering Indian supply chain diversification. The standard 1722 x 1134mm form factor ensures compatibility with all major racking systems. Waaree's rapidly expanding US distribution makes this one of the most accessible Indian-made panels in the North American market.
Pros
- + Indian-manufactured — non-Chinese supply chain alternative
- + 21.8% efficiency competitive with Chinese TOPCon leaders
- + Standard 108-cell residential format — universal racking compatibility
- + -0.30%/°C temp coefficient for hot climate performance
- + Highly competitive pricing — among the lowest-cost TOPCon panels
- + Waaree's expanding US distribution improves availability
Cons
- - 12-year product warranty shorter than 25-year leaders
- - Indian manufacturing quality perception still developing vs established brands
- - US installer familiarity and support network still growing
- - No bifacial option in this residential format
Choose LONGi Hi-MO 6 Artist 440W If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ Homeowners prioritizing curb appeal with all-black panel aesthetics.
Choose Waaree WS-440 If...
- ✓ 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
- ✓ Cost-conscious residential installers seeking high-efficiency TOPCon panels from a non-Chinese manufacturer at a competitive price point.
Our Recommendation
We recommend the Waaree WS-440 for most buyers in this comparison. It wins 3 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The LONGi Hi-MO 6 Artist 440W remains a good product, but the Waaree WS-440 delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, LONGi Hi-MO 6 Artist 440W or Waaree WS-440?
The Waaree WS-440 wins this comparison by a clear margin. It offers better long-term durability with 12-year warranty. For most residential installations, the Waaree WS-440 is the stronger choice.
Which panel is more efficient, LONGi Hi-MO 6 Artist 440W or Waaree WS-440?
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 0.2 percentage points translates to approximately 0W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO 6 Artist 440W or Waaree WS-440?
The LONGi Hi-MO 6 Artist 440W comes with a 12-year product warranty and 25-year performance guarantee. The Waaree WS-440 offers 12-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The LONGi Hi-MO 6 Artist 440W has a temperature coefficient of -0.34%/°C and the Waaree WS-440 is -0.3%/°C. Waaree WS-440 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 6 Artist 440W vs Waaree WS-440 panels do I need for an 8 kW system?
For an 8 kW system: you need 19 LONGi Hi-MO 6 Artist 440W panels (440W each) or 19 Waaree WS-440 panels (440W each). Both require the same number of panels.
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Last updated: February 2026