LONGi Hi-MO X6 445W Specifications & Review
The Hi-MO X6 is LONGi's TOPCon N-type line offering 445W in a compact format, well-suited for space-constrained residential rooftops.
What Makes the LONGi Hi-MO X6 445W Different
The LONGi Hi-MO X6 445W leverages LONGi's position as the world's largest solar panel manufacturer to deliver cutting-edge TOPCon N-type technology at 445W in a compact residential form factor. LONGi pioneered monocrystalline silicon production at scale — they produce more solar-grade silicon wafers than any other company on Earth — and this vertical integration translates to tight quality control on every cell in the 108-cell Hi-MO X6 445W. The 22% module efficiency places it competitively within the N-type residential segment, while the -0.29%/°C temperature coefficient means less power loss in hot weather compared to PERC alternatives (-0.34%/°C). The panel's 1722×1134mm footprint (1.95 m²) fits standard residential racking, and at 21.5 kg it stays within the weight limits of most residential mounting systems. LONGi's bankability as a Bloomberg Tier 1 manufacturer and their 12-year product / 25-year performance warranty provide long-term confidence.
Key Specifications
| Brand | LONGi |
| Model | LONGi Hi-MO X6 445W |
| Power Output | 445W |
| Efficiency | 22% |
| Power Density | 21.2 W/sq ft |
| Cell Type | TOPCon N-type |
| Cell Count | 108 cells |
| Dimensions | 1722 x 1134 x 30 mm |
| Weight | 21.5 kg |
| Open Circuit Voltage (Voc) | 41.5V |
| Max Power Voltage (Vmp) | 34.5V |
| Short Circuit Current (Isc) | 13.93A |
| Max Power Current (Imp) | 12.9A |
| Temp Coefficient (Pmax) | -0.29%/°C |
| Product Warranty | 12 years |
| Performance Warranty | 25 years |
| First Year Degradation | 1% |
| Annual Degradation | 0.4% |
| Country of Manufacture | China |
| Certifications | IEC 61215, IEC 61730, UL 1703 |
| Panel Type | Bifacial |
| Snow Load | 5400 Pa (112.8 psf) — Heavy Snow Rated |
| Wind Load | 2400 Pa (50.1 psf) |
Pros & Cons
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
Best For
Homeowners wanting N-type TOPCon technology in a compact residential format.
Is the LONGi Hi-MO X6 445W Worth It?
The LONGi Hi-MO X6 445W delivers 445W of power at 22% module efficiency, which is above the current industry average of approximately 21%. This higher efficiency means you need fewer panels to reach your target system size, saving roof space and potentially reducing mounting hardware costs.
From a warranty perspective, the Hi-MO X6 445W comes with a standard 12-year product warranty and a 25-year performance guarantee. The industry standard for product warranties ranges from 12 to 25 years, so you may want to weigh this shorter warranty against the overall system cost. At the end of 25 years, the panel is guaranteed to still produce approximately 89.4% of its rated output, with first-year degradation of 1% and just 0.4% per year after that.
Pricing varies by region and installer, but the Hi-MO X6 445W's combination of 22% efficiency and 12-year warranty should be weighed against per-watt quotes from your installer. Request at least three quotes to ensure you are getting competitive pricing for this tier of panel.
For hot climates, the temperature coefficient of -0.29%/°C is excellent. This is better than the typical range of -0.30% to -0.40%/°C, meaning the Hi-MO X6 445W retains more output on scorching summer days, a significant advantage in states like Arizona, Texas, and Florida. Overall, the LONGi Hi-MO X6 445W can be a reasonable choice depending on your budget and performance requirements.
Real-World Performance
In real-world conditions, the LONGi Hi-MO X6 445W delivers consistent energy production shaped by its -0.29%/°C temperature coefficient. On a hot summer day when panel surface temperatures reach 65°C (40°C above STC), the Hi-MO X6 445W loses approximately 11.6% of rated output — better than PERC panels that lose 13-14% under the same conditions. Over a full year in a typical US location, expect annual specific yield of 1,500-1,800 kWh per kW installed, depending on location, tilt, and shading. The 1% first-year degradation settles into 0.4% annual degradation thereafter; after 25 years the Hi-MO X6 445W should still produce approximately 89.4% of its original rating. In bifacial installations on light-colored ground surfaces or trackers, expect 5-15% additional energy beyond the rated front-side output. The 108 half-cut cells provide improved shade tolerance compared to full-cell designs — when one cell is shaded, only one sub-string is affected rather than an entire string, limiting production losses to approximately one-third of the panel rather than one-half.
Who Should Buy the LONGi Hi-MO X6 445W?
System Design Tips
For string inverter systems, the LONGi Hi-MO X6 445W's Voc of 41.5V allows up to 14 panels per string on a 600V inverter, or 11 panels per string on 480V systems. The Isc of 13.93A is within the input range of all major residential string inverters and microinverters. For microinverter pairing, the Enphase IQ8A (366VA) or IQ8H (384VA) handles the 445W output well with a DC/AC ratio of 1.2-1.2. SolarEdge P505 optimizers pair well for optimizer-based systems. Size your inverter at 75-90% of total DC wattage for optimal clipping management — for a 23-panel array (10.2 kW DC), a 8 W AC inverter is a good match. The panel handles 5400 Pa snow load and 2400 Pa wind load.
Price Estimate
The LONGi Hi-MO X6 445W is sold through residential solar distributors and installers. LONGi pricing varies by distributor and order volume. For a 23-panel system (10.2 kW DC), total installed cost including panels, inverter, racking, wiring, permitting, and labor typically runs $2.50-3.50/W, or approximately $30,705-$35,823 before the 30% federal ITC. After ITC: approximately $21,494-$25,076.
How the LONGi Hi-MO X6 445W Compares
| Model | Wattage | Efficiency | W/sq ft | Warranty | Snow Load | Cell Type |
|---|---|---|---|---|---|---|
| LONGi Hi-MO X6 445W (this panel) | 445W | 22% | 21.2 | 12 yrs | 5400 Pa | TOPCon N-type |
| Trina Solar Vertex S+ 445W | 445W | 22.3% | 21.2 | 15 yrs | 5400 Pa | TOPCon N-type |
| Seraphim SRP-445-BMA-HV | 445W | 22% | 21.2 | 15 yrs | 5400 Pa | TOPCon N-type |
| JinkoSolar Tiger Neo 440W | 440W | 22.2% | 20.9 | 15 yrs | 5400 Pa | TOPCon N-type |
Compare This Panel
Installation & Compatibility
System Voltage & String Sizing
- Open Circuit Voltage (Voc)
- 41.5V
- Max Power Voltage (Vmp)
- 34.5V
- Short Circuit Current (Isc)
- 13.93A
- Max Power Current (Imp)
- 12.9A
- Max Panels per String (600V)
- 14 panels
Based on NEC 600V residential limit. Actual string sizing should account for cold-temperature Voc rise. Consult your installer or use a string sizing tool for your specific location.
Mounting Requirements
- Dimensions
- 1722 x 1134 x 30 mm
- Weight
- 21.5 kg (47.4 lbs)
- Area per Panel
- 21.0 sq ft
- Weight per sq ft
- 2.3 lbs/sq ft
Recommended Inverter Types
- - Microinverters: Ideal for shaded roofs or complex layouts. Match to panels rated 445W+.
- - String Inverters: Cost-effective for unshaded arrays. Ensure MPPT range covers 34.5V.
- - Hybrid Inverters: Best if adding battery storage. Check DC input specs match panel Voc of 41.5V.
Frequently Asked Questions
How efficient is the LONGi Hi-MO X6 445W compared to other panels?
The Hi-MO X6 445W achieves 22% module efficiency, which is above average for N-type residential panels. N-type TOPCon panels in our database range from 21.5% to 23.0%, placing the Hi-MO X6 445W in the upper half of that range. Higher efficiency means more watts per square foot of roof space.
What is the warranty on the LONGi Hi-MO X6 445W?
LONGi provides a 12-year product warranty covering manufacturing defects and a 25-year performance warranty guaranteeing output levels. The performance warranty typically starts at 99% after year 1 and degrades by 0.4% per year, guaranteeing approximately 89.4% output at year 25. The product warranty is in line with industry standards.
How many LONGi Hi-MO X6 445W panels do I need for my home?
For a typical US home using 10,000 kWh per year, you need approximately 23 panels (10.2 kW system) assuming 4-5 peak sun hours per day. This varies significantly by location — homes in Arizona may need 20-22 panels while homes in the Pacific Northwest may need 25-27 panels. Your installer will calculate the exact number based on your utility bills, roof orientation, shading, and local solar resource.
What is the efficiency of the LONGi Hi-MO X6 445W?
The LONGi Hi-MO X6 445W achieves 22% module efficiency using TOPCon N-type cell technology. This is around the industry average for residential solar panels in 2026.
What warranty does the LONGi Hi-MO X6 445W include?
It comes with a 12-year product warranty and a 25-year performance warranty guaranteeing output at approximately 89.4% of rated power at the end of the warranty period.
How does the LONGi Hi-MO X6 445W perform in hot weather?
With a temperature coefficient of -0.29%/°C, the Hi-MO X6 445W handles heat well with minimal power loss. Every degree above 25°C reduces output by 0.29%.
What size system can I build with the LONGi Hi-MO X6 445W?
At 445W per panel, you would need approximately 18 panels for an 8 kW system or 23 panels for a 10 kW system. Each panel measures 1722 x 1134 mm (21.0 sq ft).
What inverter is best with the LONGi Hi-MO X6 445W?
The LONGi Hi-MO X6 445W works well with both string inverters and microinverters. For string inverters, choose one with a maximum input voltage above 41.5V and an MPPT voltage range that covers 34.5V. Microinverters rated for 445W+ panels are also an excellent choice, offering panel-level monitoring and shade tolerance. Popular options include Enphase IQ8 series microinverters and SolarEdge string inverters with power optimizers.
How long will the LONGi Hi-MO X6 445W last?
The LONGi Hi-MO X6 445W is built to last well beyond its 25-year performance warranty. With first-year degradation of 1% and annual degradation of 0.4% thereafter, the panel will still produce approximately 89.4% of its rated power after 25 years. Most modern solar panels continue generating useful power for 30-40 years, though output gradually decreases over time.
Is the LONGi Hi-MO X6 445W good for Arizona and other sunny states?
Yes, the LONGi Hi-MO X6 445W is an excellent choice for hot, sunny states like Arizona, Nevada, and Texas. Its temperature coefficient of -0.29%/°C is better than the industry average of -0.35%/°C, meaning it retains more power output on hot days. Higher sun exposure in these states means more total energy production throughout the year, often offsetting any heat-related losses.
Is the LONGi Hi-MO X6 445W worth the money?
The LONGi Hi-MO X6 445W delivers 22% efficiency, which is above the industry average of ~21%. Combined with a standard 12-year product warranty and 25-year performance guarantee, it offers strong value for homeowners seeking reliable solar generation.
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Last updated: February 2026