LONGi Hi-MO 6 580W vs JA Solar DeepBlue 3.0 400W
The LONGi Hi-MO 6 580W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 20.9%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the LONGi Hi-MO 6 580W is the stronger choice.
Key Differences
- • LONGi Hi-MO 6 580W is rated at 580W while JA Solar DeepBlue 3.0 400W is rated at 400W, a 180W difference.
- • LONGi Hi-MO 6 580W achieves 22.3% efficiency vs 20.9% for the other, a 1.4 percentage point gap.
- • Both carry matching 12-year product warranties.
- • LONGi Hi-MO 6 580W has a superior temperature coefficient of -0.34%/°C vs -0.35%/°C, retaining more power in hot climates.
- • LONGi Hi-MO 6 580W uses PERC Mono Half-cut cells while JA Solar DeepBlue 3.0 400W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO 6 580W achieves 22.3% module efficiency compared to JA Solar DeepBlue 3.0 400W's 20.9%, meaning LONGi Hi-MO 6 580W converts 1.4 percentage points more sunlight into electricity per square meter. In practical terms, the LONGi Hi-MO 6 580W produces 224.5 watts per square meter of panel area while the JA Solar DeepBlue 3.0 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 6 580W delivers 580W per panel versus 400W for the JA Solar DeepBlue 3.0 400W, a 180W difference per module. To build an 8 kW residential system, you would need 14 LONGi Hi-MO 6 580W panels or 20 JA Solar DeepBlue 3.0 400W panels. Choosing the higher-wattage option saves 6 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 LONGi Hi-MO 6 580W has a temperature coefficient of -0.34%/°C versus -0.35%/°C for the JA Solar DeepBlue 3.0 400W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the LONGi Hi-MO 6 580W retains 93.2% of its rated power while the other retains 93.0%. 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 580W is backed by a 12-year product warranty and 25-year performance guarantee, while the JA Solar DeepBlue 3.0 400W 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 580W; 2% first year then 0.5%/year for JA Solar DeepBlue 3.0 400W), after 25 years the LONGi Hi-MO 6 580W should retain approximately 86.5% of original output versus 86.0% for the JA Solar DeepBlue 3.0 400W. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The LONGi Hi-MO 6 580W measures 2278×1134×35mm and weighs 28.4 kg, while the JA Solar DeepBlue 3.0 400W measures 1722×1134×30mm at 20.5 kg. 2.58 m² of panel area for the LONGi Hi-MO 6 580W versus 1.95 m² for the JA Solar DeepBlue 3.0 400W. The JA Solar DeepBlue 3.0 400W is 7.9 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 158 kg. The more compact JA Solar DeepBlue 3.0 400W may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | LONGi Hi-MO 6 580W | JA Solar DeepBlue 3.0 400W |
|---|---|---|
| Power | 580W | 400W |
| Efficiency | 22.3% | 20.9% |
| Power Density | 20.9 W/sq ft | 19.0 W/sq ft |
| Cell Type | PERC Mono Half-cut | PERC Mono |
| Bifacial | No | No |
| Weight | 28.4 kg | 20.5 kg |
| Temp Coefficient | -0.34%/°C | -0.35%/°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% | 2% |
| Annual Degradation | 0.5% | 0.5% |
| Country | China | China |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: LONGi Hi-MO 6 580WThe LONGi Hi-MO 6 580W achieves 22.3% efficiency versus 20.9% — a 1.4 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 5.4 kW more total system capacity, or 25 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: LONGi Hi-MO 6 580WThe LONGi Hi-MO 6 580W has a better temperature coefficient of -0.34%/°C versus -0.35%/°C. On a 45°C summer day (20°C above STC), the winner retains 93.2% of rated power versus 93.0%. The difference is modest but accumulates over 25 years of summer production.
3. Durability & Warranty
Winner: TieBoth panels offer identical 12-year product warranties and 0.5% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: LONGi Hi-MO 6 580WThe LONGi Hi-MO 6 580W delivers 580W versus 400W per panel — 180W more. For an 8 kW system, you need 14 panels with the higher-wattage option versus 20 panels, saving 6 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe LONGi Hi-MO 6 580W uses PERC Mono Half-cut: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. The JA Solar DeepBlue 3.0 400W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. Both are equivalent-generation technologies.
LONGi Hi-MO 6 580W
LONGi Hi-MO 6 is a high-performance PERC mono half-cut panel delivering 580W with 22.3% efficiency, ideal for residential and commercial rooftops.
Pros
- + High 22.3% efficiency
- + Proven PERC technology
- + Strong bifacial gain potential
- + Competitive pricing
Cons
- - Large physical size
- - Requires compatible racking
- - Limited US availability
JA Solar DeepBlue 3.0 400W
The DeepBlue 3.0 is an affordable 400W PERC panel ideal for budget-conscious residential solar installations.
Pros
- + Very affordable
- + Lightweight design
- + Easy installation
- + Proven technology
Cons
- - Lower efficiency
- - Higher degradation rate
- - Shorter warranty
Choose LONGi Hi-MO 6 580W 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 live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ Homeowners wanting high-output PERC performance at a competitive price.
Choose JA Solar DeepBlue 3.0 400W If...
- ✓ Budget installations where cost per watt is the primary concern.
Our Recommendation
The LONGi Hi-MO 6 580W is the decisive winner in this solar panel comparison, outperforming the JA Solar DeepBlue 3.0 400W in 3 of 5 dimensions. Unless you have a specific requirement that the JA Solar DeepBlue 3.0 400W uniquely addresses, the LONGi Hi-MO 6 580W is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, LONGi Hi-MO 6 580W or JA Solar DeepBlue 3.0 400W?
The LONGi Hi-MO 6 580W wins this comparison by a decisive margin. It leads in efficiency (22.3% vs 20.9%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the LONGi Hi-MO 6 580W is the stronger choice.
Which panel is more efficient, LONGi Hi-MO 6 580W or JA Solar DeepBlue 3.0 400W?
The LONGi Hi-MO 6 580W at 22.3% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.4 percentage points translates to approximately 180W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO 6 580W or JA Solar DeepBlue 3.0 400W?
The LONGi Hi-MO 6 580W comes with a 12-year product warranty and 25-year performance guarantee. The JA Solar DeepBlue 3.0 400W 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 580W has a temperature coefficient of -0.34%/°C and the JA Solar DeepBlue 3.0 400W is -0.35%/°C. LONGi Hi-MO 6 580W 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 580W vs JA Solar DeepBlue 3.0 400W panels do I need for an 8 kW system?
For an 8 kW system: you need 14 LONGi Hi-MO 6 580W panels (580W each) or 20 JA Solar DeepBlue 3.0 400W panels (400W each). The LONGi Hi-MO 6 580W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026