Maxeon Maxeon 6 425W Specifications & Review
The Maxeon 6 delivers 425W with 22.2% efficiency and the same industry-leading 40-year warranty as the Maxeon 7 series.
What Makes the Maxeon Maxeon 6 425W Different
The Maxeon Maxeon 6 425W comes from Maxeon Solar Technologies, the company behind SunPower's legendary IBC (Interdigitated Back Contact) cell technology. Maxeon panels have the longest track record of any premium solar brand, with over 40 years of research behind their cell architecture. The Maxeon 6 425W delivers 425W at 22.2% efficiency, and Maxeon's IBC cells place all electrical contacts on the rear of the cell, eliminating front-side shading losses that affect conventional panels. This creates the distinctive all-black appearance that homeowners find aesthetically superior. Maxeon backs their panels with one of the longest warranty packages in the industry — 40-year product and 40-year performance guarantees — reflecting their confidence in unmatched durability.
Key Specifications
| Brand | Maxeon |
| Model | Maxeon Maxeon 6 425W |
| Power Output | 425W |
| Efficiency | 22.2% |
| Power Density | 20.4 W/sq ft |
| Cell Type | IBC (Interdigitated Back Contact) |
| Cell Count | 66 cells |
| Dimensions | 1872 x 1032 x 30 mm |
| Weight | 20.5 kg |
| Open Circuit Voltage (Voc) | 68.5V |
| Max Power Voltage (Vmp) | 57.5V |
| Short Circuit Current (Isc) | 7.95A |
| Max Power Current (Imp) | 7.39A |
| Temp Coefficient (Pmax) | -0.27%/°C |
| Product Warranty | 40 years |
| Performance Warranty | 40 years |
| First Year Degradation | 0.25% |
| Annual Degradation | 0.25% |
| Country of Manufacture | Malaysia |
| Certifications | IEC 61215, IEC 61730, UL 1703 |
| Panel Type | Bifacial |
| Snow Load | 5400 Pa (112.8 psf) — Heavy Snow Rated |
| Wind Load | 3600 Pa (75.2 psf) |
Pros & Cons
Pros
- ✓ 40-year complete warranty
- ✓ 22.2% IBC efficiency
- ✓ Excellent aesthetics
- ✓ Ultra-low degradation
Cons
- ✗ Very high cost per watt
- ✗ Limited installer network
- ✗ Fewer wattage options
Best For
Homeowners seeking a premium panel with the longest warranty available.
Is the Maxeon Maxeon 6 425W Worth It?
The Maxeon Maxeon 6 425W delivers 425W of power at 22.2% 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 Maxeon 6 425W comes with a industry-leading 40-year product warranty and a 40-year performance guarantee. The industry standard for product warranties ranges from 12 to 25 years, so this panel sits at the top of that range, giving you long-term peace of mind. At the end of 40 years, the panel is guaranteed to still produce approximately 90.0% of its rated output, with first-year degradation of 0.25% and just 0.25% per year after that.
Pricing varies by region and installer, but the Maxeon 6 425W's combination of 22.2% efficiency and 40-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 -0.27%/°C is excellent. This is better than the typical range of -0.30% to -0.40%/°C, meaning the Maxeon 6 425W retains more output on scorching summer days, a significant advantage in states like Arizona, Texas, and Florida. Overall, the Maxeon Maxeon 6 425W represents a strong value proposition for most residential installations.
Real-World Performance
In real-world conditions, the Maxeon Maxeon 6 425W delivers consistent energy production shaped by its -0.27%/°C temperature coefficient. On a hot summer day when panel surface temperatures reach 65°C (40°C above STC), the Maxeon 6 425W loses approximately 10.8% 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 1,400-1,700 kWh per kW installed, depending on location, tilt, and shading. The 0.25% first-year degradation settles into 0.25% annual degradation thereafter; after 25 years the Maxeon 6 425W should still produce approximately 93.8% 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 66 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 Maxeon Maxeon 6 425W?
System Design Tips
For string inverter systems, the Maxeon Maxeon 6 425W's Voc of 68.5V allows up to 8 panels per string on a 600V inverter, or 7 panels per string on 480V systems. The Isc of 7.95A 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 425W output well with a DC/AC ratio of 1.2-1.1. 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 24-panel array (10.2 kW DC), a 8 W AC inverter is a good match. The panel handles 5400 Pa snow load and 3600 Pa wind load.
Price Estimate
The Maxeon Maxeon 6 425W is sold through residential solar distributors and installers. Maxeon pricing varies by distributor and order volume. For a 24-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 $30,600-$35,700 before the 30% federal ITC. After ITC: approximately $21,420-$24,990.
How the Maxeon Maxeon 6 425W Compares
| Model | Wattage | Efficiency | W/sq ft | Warranty | Snow Load | Cell Type |
|---|---|---|---|---|---|---|
| Maxeon Maxeon 6 425W (this panel) | 425W | 22.2% | 20.4 | 40 yrs | 5400 Pa | IBC (Interdigitated Back Contact) |
| Q CELLS Q.TRON 425W | 425W | 21.8% | 20.2 | 25 yrs | 5400 Pa | TOPCon N-type |
| LONGi Hi-MO 6 Explorer 430W | 430W | 21.6% | 20.5 | 12 yrs | 5400 Pa | PERC Mono |
| Trina Solar Vertex S 420W | 420W | 21.3% | 19.5 | 15 yrs | 5400 Pa | PERC Mono |
Compare This Panel
Installation & Compatibility
System Voltage & String Sizing
- Open Circuit Voltage (Voc)
- 68.5V
- Max Power Voltage (Vmp)
- 57.5V
- Short Circuit Current (Isc)
- 7.95A
- Max Power Current (Imp)
- 7.39A
- Max Panels per String (600V)
- 8 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
- 1872 x 1032 x 30 mm
- Weight
- 20.5 kg (45.2 lbs)
- Area per Panel
- 20.8 sq ft
- Weight per sq ft
- 2.2 lbs/sq ft
Recommended Inverter Types
- - Microinverters: Ideal for shaded roofs or complex layouts. Match to panels rated 425W+.
- - String Inverters: Cost-effective for unshaded arrays. Ensure MPPT range covers 57.5V.
- - Hybrid Inverters: Best if adding battery storage. Check DC input specs match panel Voc of 68.5V.
Frequently Asked Questions
How efficient is the Maxeon Maxeon 6 425W compared to other panels?
The Maxeon 6 425W achieves 22.2% module efficiency, which is above average for PERC residential panels. PERC panels typically range from 20.0% to 21.8%, and the Maxeon 6 425W is near the top within that range. Higher efficiency means more watts per square foot of roof space.
What is the warranty on the Maxeon Maxeon 6 425W?
Maxeon provides a 40-year product warranty covering manufacturing defects and a 40-year performance warranty guaranteeing output levels. The performance warranty typically starts at 99.75% after year 1 and degrades by 0.25% per year, guaranteeing approximately 93.8% output at year 25. The extended product warranty coverage exceeds the industry standard of 10-12 years.
How many Maxeon Maxeon 6 425W panels do I need for my home?
For a typical US home using 10,000 kWh per year, you need approximately 24 panels (10.2 kW system) assuming 4-5 peak sun hours per day. This varies significantly by location — homes in Arizona may need 21-23 panels while homes in the Pacific Northwest may need 26-28 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 Maxeon Maxeon 6 425W?
The Maxeon Maxeon 6 425W achieves 22.2% module efficiency using IBC (Interdigitated Back Contact) cell technology. This is above the industry average for residential solar panels in 2026.
What warranty does the Maxeon Maxeon 6 425W include?
It comes with a 40-year product warranty and a 40-year performance warranty guaranteeing output at approximately 90.0% of rated power at the end of the warranty period.
How does the Maxeon Maxeon 6 425W perform in hot weather?
With a temperature coefficient of -0.27%/°C, the Maxeon 6 425W handles heat well with minimal power loss. Every degree above 25°C reduces output by 0.27%.
What size system can I build with the Maxeon Maxeon 6 425W?
At 425W per panel, you would need approximately 19 panels for an 8 kW system or 24 panels for a 10 kW system. Each panel measures 1872 x 1032 mm (20.8 sq ft).
What inverter is best with the Maxeon Maxeon 6 425W?
The Maxeon Maxeon 6 425W works well with both string inverters and microinverters. For string inverters, choose one with a maximum input voltage above 68.5V and an MPPT voltage range that covers 57.5V. Microinverters rated for 425W+ 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 Maxeon Maxeon 6 425W last?
The Maxeon Maxeon 6 425W is built to last well beyond its 40-year performance warranty. With first-year degradation of 0.25% and annual degradation of 0.25% thereafter, the panel will still produce approximately 90.0% of its rated power after 40 years. Most modern solar panels continue generating useful power for 30-40 years, though output gradually decreases over time.
Is the Maxeon Maxeon 6 425W good for Arizona and other sunny states?
Yes, the Maxeon Maxeon 6 425W is an excellent choice for hot, sunny states like Arizona, Nevada, and Texas. Its temperature coefficient of -0.27%/°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 Maxeon Maxeon 6 425W worth the money?
The Maxeon Maxeon 6 425W delivers 22.2% efficiency, which is above the industry average of ~21%. Combined with a industry-leading 40-year product warranty and 40-year performance guarantee, it offers strong value for homeowners seeking reliable solar generation.
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Last updated: February 2026