LONGi Hi-MO X6 445W vs Seraphim S4 Series 430W
The LONGi Hi-MO X6 445W wins this comparison by a clear margin. It leads in efficiency (22% vs 21.2%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the LONGi Hi-MO X6 445W is the stronger choice.
Key Differences
- • LONGi Hi-MO X6 445W is rated at 445W while Seraphim S4 Series 430W is rated at 430W, a 15W difference.
- • LONGi Hi-MO X6 445W achieves 22% efficiency vs 21.2% for the other, a 0.8 percentage point gap.
- • Both carry matching 12-year product warranties.
- • LONGi Hi-MO X6 445W has a superior temperature coefficient of -0.29%/°C vs -0.34%/°C, retaining more power in hot climates.
- • LONGi Hi-MO X6 445W uses TOPCon N-type cells while Seraphim S4 Series 430W uses PERC Mono cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The LONGi Hi-MO X6 445W achieves 22% module efficiency compared to Seraphim S4 Series 430W's 21.2%, meaning LONGi Hi-MO X6 445W converts 0.8 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 Seraphim S4 Series 430W produces 220.2 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 430W for the Seraphim S4 Series 430W, a 15W difference per module. To build an 8 kW residential system, you would need 18 LONGi Hi-MO X6 445W panels or 19 Seraphim S4 Series 430W 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 LONGi Hi-MO X6 445W has a temperature coefficient of -0.29%/°C versus -0.34%/°C for the Seraphim S4 Series 430W. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the LONGi Hi-MO X6 445W retains 94.2% 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 LONGi Hi-MO X6 445W is backed by a 12-year product warranty and 25-year performance guarantee, while the Seraphim S4 Series 430W offers 12-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1% first year then 0.4%/year for LONGi Hi-MO X6 445W; 1.5% first year then 0.5%/year for Seraphim S4 Series 430W), after 25 years the LONGi Hi-MO X6 445W should retain approximately 89.4% of original output versus 86.5% for the Seraphim S4 Series 430W. This 2.9 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 Seraphim S4 Series 430W measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the LONGi Hi-MO X6 445W versus 1.95 m² for the Seraphim S4 Series 430W. 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 | Seraphim S4 Series 430W |
|---|---|---|
| Power | 445W | 430W |
| Efficiency | 22% | 21.2% |
| Power Density | 21.2 W/sq ft | 20.5 W/sq ft |
| Cell Type | TOPCon N-type | PERC Mono |
| Bifacial | Yes | No |
| Weight | 21.5 kg | 21 kg |
| Temp Coefficient | -0.29%/°C | -0.34%/°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% | 1.5% |
| Annual Degradation | 0.4% | 0.5% |
| Country | China | China |
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 21.2% — a 0.8 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.5 kW more total system capacity, or 3 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: LONGi Hi-MO X6 445WThe LONGi Hi-MO X6 445W has a better temperature coefficient of -0.29%/°C versus -0.34%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% 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 X6 445WLONGi Hi-MO X6 445W degrades more slowly at 0.4% per year versus 0.5%. After 25 years, expect 89.4% vs 86.5% of original output for LONGi Hi-MO X6 445W and Seraphim S4 Series 430W respectively.
4. Power Output
Winner: LONGi Hi-MO X6 445WThe LONGi Hi-MO X6 445W delivers 445W versus 430W per panel — 15W 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: LONGi Hi-MO X6 445WThe 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 Seraphim S4 Series 430W uses PERC Mono: PERC (Passivated Emitter Rear Cell) is the current mainstream technology, offering good efficiency at the lowest manufacturing cost. TOPCon 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
Seraphim S4 Series 430W
The Seraphim S4 Series delivers 430W using proven PERC technology at a competitive price point for residential installations.
Pros
- + Competitive pricing
- + Proven PERC technology
- + Compact design
- + Good value
Cons
- - Standard PERC efficiency
- - Shorter warranty period
- - Limited US presence
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 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
Choose Seraphim S4 Series 430W If...
- ✓ Budget residential installations seeking competitive PERC pricing.
Our Recommendation
We recommend the LONGi Hi-MO X6 445W for most buyers in this comparison. It wins 5 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Seraphim S4 Series 430W remains a good product, but the LONGi Hi-MO X6 445W delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, LONGi Hi-MO X6 445W or Seraphim S4 Series 430W?
The LONGi Hi-MO X6 445W wins this comparison by a clear margin. It leads in efficiency (22% vs 21.2%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the LONGi Hi-MO X6 445W is the stronger choice.
Which panel is more efficient, LONGi Hi-MO X6 445W or Seraphim S4 Series 430W?
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 0.8 percentage points translates to approximately 15W per panel under standard test conditions.
Which has a better warranty, LONGi Hi-MO X6 445W or Seraphim S4 Series 430W?
The LONGi Hi-MO X6 445W comes with a 12-year product warranty and 25-year performance guarantee. The Seraphim S4 Series 430W 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 X6 445W has a temperature coefficient of -0.29%/°C and the Seraphim S4 Series 430W is -0.34%/°C. LONGi Hi-MO X6 445W 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 Seraphim S4 Series 430W 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 19 Seraphim S4 Series 430W panels (430W each). The LONGi Hi-MO X6 445W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026