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Premium TierNuWatt RecommendedSilfab
Made in North America — HJT technology with a 30-year warranty
The Silfab SIL-440-BG is a premium panel manufactured in the United States and Canada using HJT (Heterojunction) cell technology. HJT cells combine crystalline silicon with amorphous silicon thin-film layers for exceptional efficiency, outstanding temperature performance, and ultra-low degradation. With a 30-year warranty and the best temperature coefficient in our lineup (-0.26%/°C), the Silfab is the top North American-made choice for homeowners who want maximum long-term production.
Wattage
440W
Efficiency
22.2%
Temp Coeff
-0.26%
Warranty
30 yr
Price Tier
$$$
The Silfab SIL-440-BG 440W delivers 22.2% efficiency with HJT cell technology, backed by a 30-year product warranty and 90.8% guaranteed output at year 25. As a premium-tier panel, it uses advanced HJT cell technology for superior long-term performance, justified by a moderate price premium. NuWatt recommends this panel for most residential installations.
Complete electrical, mechanical, warranty, and certification data for the Silfab SIL-440-BG 440W. All specifications are sourced from the manufacturer's official datasheet.
Source: Silfab official datasheet
The Silfab SIL-440-BG 440W carries a temperature coefficient of -0.26%/°C. In practical terms, this means that for every degree Celsius above 25°C (77°F) — the standard test condition temperature — the panel loses 0.26% of its rated output. On a 95°F summer day in Massachusetts, with roof surface temperatures reaching 60°C, a panel's output drops by approximately 9.1%. A lower (less negative) temperature coefficient is better. At -0.26%/°C, the Silfab SIL-440-BG has one of the best temperature coefficients available, meaning it retains more power on hot days than most competitors.
The Silfab SIL-440-BG 440W uses 108 half-cut cells, which improves shade tolerance compared to traditional full-cell designs. When a shadow falls across part of the panel, half-cut cell architecture limits the impact to only the affected string of cells, allowing the unshaded portions to continue producing near full power. This matters for rooftops with intermittent shading from trees, chimneys, vents, or neighboring structures.
A 20-panel system (8.8 kW) using Silfab SIL-440-BG 440W panels in Massachusetts produces approximately 11,000 kWh/year. That is roughly 917 kWh per month — enough to offset the electricity usage of many New England homes. Actual production varies based on roof orientation, tilt angle, shading, and local weather patterns.
Over the 30-year performance warranty period, the Silfab SIL-440-BG 440W guarantees at least 98.5% output in year one, degrading linearly to 90.8% by year 25. The annual degradation rate works out to approximately 0.32% per year — a figure that directly affects your lifetime energy production and savings. This is an exceptionally low degradation rate, among the best in the residential solar market.
Comparing the Silfab SIL-440-BG degradation curve against similar panels in our lineup.
Guaranteed minimum output over 25 years
The Silfab SIL-440-BG 440W includes a 30-year product warranty covering manufacturing defects, material failures, and workmanship issues, plus a 30-year performance warranty guaranteeing minimum output levels over time. The product warranty protects you if the panel physically fails; the performance warranty ensures it keeps producing electricity at guaranteed levels.
The degradation curve above shows the guaranteed minimum output over 25 years. Starting at 98.5% in year one and declining to 90.8% by year 25, the Silfab SIL-440-BG is competitive with the comparison panels shown. In real-world conditions, panels often exceed their warranty guarantees — the numbers shown represent the manufacturer's guaranteed minimum, not expected average performance.
When evaluating warranty strength, consider the manufacturer's financial stability. A 25 or 30-year warranty is only as good as the company backing it. Silfab maintains manufacturing operations with a track record in the solar industry, though buyers should consider company size relative to larger manufacturers.
Estimate your system cost and production based on the Silfab SIL-440-BG 440W.
System Size
8.8 kW
Annual Production
11,000 kWh
Est. System Cost
$28,168
Price/Watt
$3.20
Estimates based on 4.2 peak sun hours/day in Massachusetts, 20 × 440W Silfab SIL-440-BG 440W panels. System cost is an estimate before any state rebates. The federal residential solar tax credit (25D) expired Dec 31, 2025. Actual production depends on roof orientation, shading, and system design.Get a precise quote →
The Silfab SIL-440-BG 440W has a price adder of +$0.12/W compared to our base panel option. For a standard 20-panel system, this translates to approximately $1,056 more than the base panel option.
System pricing varies by state due to permitting costs, labor markets, and local regulations. Use the calculator above to estimate costs for your specific location. All prices shown are pre-rebate — state incentives and utility programs may further reduce your out-of-pocket cost. Note that the federal residential solar tax credit (Section 25D) expired on December 31, 2025, and is no longer available to homeowners purchasing solar systems.
The premium pricing of the Silfab SIL-440-BG is justified by its advancedHJT cell technology, superior temperature coefficient, and stronger degradation guarantee. Over 25 years, the higher per-panel production and slower degradation often offset the upfront premium — especially for homeowners with limited roof space who need maximum output from each panel position.
“Silfab panels are some of the lightest in our lineup at 20.5 kg, which our crews appreciate on steep roofs. The frame dimensions match standard racking. The bifacial glass-glass construction makes them extremely durable — we've seen zero breakage in transit or installation. The 30-year warranty gives homeowners exceptional long-term confidence. We recommend Silfab for customers who care about where their panels are made.”
— NuWatt Energy Install Team
NABCEP-certified installers, 2,500+ residential installations
Side-by-side specifications against similar panels in our lineup. Green values indicate an advantage; muted values show where other panels lead.
| Specification | Silfab SIL-440-BG | QCells Q.TRON BLK M-G11S+ | REC Alpha Pure-RX |
|---|---|---|---|
| Wattage | 440W | 435W | 460W |
| Efficiency | 22.2% | 22% | 22.5% |
| Cell Type | HJT | N-type TOPCon | HJT |
| Temp Coefficient | -0.26%/°C | -0.3%/°C | -0.24%/°C |
| Product Warranty | 30 yr | 25 yr | 25 yr |
| Performance Warranty | 30 yr | 25 yr | 25 yr |
| Year 25 Output | 90.8% | 88% | 92% |
| Weight | 20.5 kg | 21 kg | 21.5 kg |
| Dimensions | 1722×1134mm | 1722×1134mm | 1821×1016mm |
| Made In | Washington, USA / Ontario, Canada | Georgia, USA | Singapore |
| Price Tier | Premium | Moderate | Premium |
The Silfab SIL-440-BG 440W is specifically suited for these scenarios:
Not sure which panel fits your roof and budget? Get a free custom design from NuWatt and we will recommend the right panel for your specific situation.
Common questions about the Silfab SIL-440-BG 440W, answered by NuWatt's NABCEP-certified team.
Silfab manufactures solar panels at facilities in Burlington, Washington (USA) and Mississauga, Ontario (Canada). The company is one of the few solar manufacturers with dedicated North American production, and their panels qualify for Buy American Act compliance.
HJT (Heterojunction Technology) combines crystalline silicon with thin layers of amorphous silicon to create a solar cell with exceptional efficiency and minimal degradation. HJT cells have the best temperature coefficient of any mainstream technology, meaning they lose less power on hot days. They also experience lower light-induced degradation (LID) than PERC or even standard N-type cells.
Yes. Silfab has been manufacturing solar panels in North America since 2010. They are one of the few vertically integrated solar manufacturers on the continent, controlling quality from cell to finished module. Their 30-year warranty is backed by their North American operations and financial stability.
Both use HJT technology. The REC Alpha (460W) has higher wattage and slightly better efficiency (22.5% vs 22.2%). The Silfab (440W) costs less per watt, has a 30-year warranty (vs REC's 25-year), and is made in North America (vs REC's Singapore factory). Choose REC for maximum power, Silfab for the longest warranty and domestic manufacturing.
Silfab provides a 30-year product warranty and a 30-year linear performance warranty guaranteeing at least 90.8% output at year 25 and 87.4% at year 30. This is the strongest warranty available in our panel lineup.
Every project is different. Explore these alternatives to find the best fit for your roof, budget, and goals.
Premium TierRecommendedQCells
Next-gen N-type TOPCon — more power from the same footprint
View Details
Premium TierREC
Highest wattage, highest efficiency — the premium benchmark
View Details
Premium TierCanadian Solar
Global #1 volume — N-type TOPCon from the world's largest manufacturer
View DetailsNuWatt installs Silfab SIL-440-BG 440W panels across New England and beyond. Get a free, no-obligation solar quote with accurate pricing, production estimates, and financing options for your specific roof.