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Understand the four main types of solar panels, compare their efficiency and cost per watt, and learn which technology is the right fit for your home, budget, and climate.
Quick Answer
As of 2026, monocrystalline panels dominate the residential market with 90%+ share and 20-23% efficiency. Polycrystalline panels are largely obsolete for home use. Bifacial panels excel in ground-mount and commercial applications. For most homeowners, the choice comes down to which monocrystalline sub-type (PERC vs HJT) best fits their budget and climate.
Solar panels are categorized by the semiconductor material used to convert sunlight into electricity. Each type has distinct advantages in efficiency, cost, appearance, and application. Here is what you need to know about each in the current market.
Monocrystalline panels are made from a single continuous crystal of silicon, cut from a cylindrical ingot using the Czochralski process. This produces a uniform cell structure that converts sunlight at 20-23% efficiency, the highest of any mainstream panel type.
There are two major sub-types dominating the market in 2026:
PERC (Passivated Emitter Rear Contact)
HJT (Heterojunction Technology)
Appearance: All-black or black with silver frame. The uniform dark color comes from the single-crystal structure and is generally considered the most aesthetically appealing panel type for residential roofs.
Polycrystalline panels are made from multiple silicon crystals melted together. The multi-crystal structure creates the distinctive blue, speckled appearance. While they were once the budget-friendly option, the price gap with monocrystalline has narrowed significantly. In 2026, polycrystalline accounts for less than 5% of new residential installations.
At 15-18% efficiency, you need roughly 25-35% more roof space to produce the same amount of electricity as monocrystalline panels. Most major manufacturers have stopped producing residential polycrystalline panels entirely, shifting all production capacity to monocrystalline lines.
Bottom line: Unless you find an exceptionally cheap closeout deal and have unlimited roof space, polycrystalline panels are not a competitive choice in 2026.
Thin-film panels deposit one or more layers of photovoltaic material onto a substrate (glass, plastic, or metal). The three main chemistries are cadmium telluride (CdTe), copper indium gallium selenide (CIGS), and amorphous silicon (a-Si).
First Solar (CdTe) is the dominant thin-film manufacturer, supplying primarily utility-scale projects. Thin-film excels in partial shade conditions and has the lowest temperature coefficient (-0.20%/C), but 10-13% efficiency makes it impractical for space-constrained residential roofs.
Cost advantage at scale: At $1.00-$1.50/W for materials, thin-film is the cheapest panel type. But for residential, the additional racking, labor, and BOS (balance of system) costs to cover more roof area erase this advantage.
Bifacial panels use a glass-glass construction with monocrystalline cells visible from both sides. The rear side captures albedo, reflected light from the surface below. On a white TPO commercial roof or light-colored gravel, bifacial panels can produce 10-25% more electricity than monofacial panels of the same wattage.
For residential rooftops, the benefit is minimal (2-5% gain) because flush-mounted panels leave little space for rear illumination. Bifacial truly shines on:
Side-by-side specs for all four panel types as of March 2026.
| Specification | Monocrystalline (Mono PERC) | Monocrystalline (HJT) | Polycrystalline | Thin-Film (CdTe) | Bifacial (Mono) |
|---|---|---|---|---|---|
| Efficiency | 20-21% | 21-23% | 15-18% | 10-13% | 20-23% (+5-25% rear) |
| Cost/Watt (Installed) | $2.50-$3.20 | $2.70-$3.50 | $2.20-$2.80 | $1.00-$1.50 | $2.80-$3.60 |
| Temp Coefficient | -0.35%/C | -0.26%/C | -0.40%/C | -0.20%/C | -0.30%/C |
| Lifespan | 25-30 years | 30+ years | 25 years | 20-25 years | 30+ years |
| Degradation Rate | 0.4-0.5%/yr | 0.25-0.3%/yr | 0.5-0.7%/yr | 0.5-1.0%/yr | 0.3-0.4%/yr |
| Appearance | All-black, uniform | All-black, uniform | Blue, speckled pattern | Dark, uniform, flexible | Glass-glass, semi-transparent |
| Best For | Residential rooftops | Hot climates, premium installs | Budget commercial, legacy | Utility-scale, commercial | Ground-mount, carports |
| Market Share | ~75% | ~15% | ~5% | ~4% | ~1% resi, ~20% utility |
Every solar panel loses efficiency as it heats up. The temperature coefficient measures how much power output drops per degree Celsius above 25C (77F). On a hot summer day in Texas, rooftop panel temperatures can reach 65-70C. That is 40-45C above the test standard.
Panel temp: ~65C (40C above STC)
HJT saves ~3.6% more output than PERC on hot days, translating to 5-8% more annual production in Texas.
Panel temp: ~35-45C (10-20C above STC)
In cooler climates, the PERC vs HJT gap narrows to 1-2%. The premium for HJT is harder to justify on cost alone in New England.
Practical takeaway: If you live in Texas or the Southeast, HJT panels (like the Silfab 440W or REC 460W) pay back their premium through higher year-round production. In New England, PERC panels (like the Hyundai 440W) offer better ROI unless you plan to keep the system 30+ years.
Cost per watt is the most important metric for comparing solar panels. It includes the panel hardware, inverter, racking, labor, permits, and all balance-of-system costs. These are fully installed prices, not just module costs.
Example: Hyundai 440W. Most affordable residential option. 8 kW system: ~$20,000-$25,600
Example: Silfab 440W. FEOC-compliant, lower degradation. 8 kW system: ~$21,600-$28,000
Example: REC 460W. Highest efficiency, best for constrained roofs. 8 kW system: ~$23,200-$29,600
Example: Legacy brands. Cheapest per watt but needs 25-35% more panels for same output
Example: First Solar. Module cost only. Not available for residential installation
With the federal 25D residential solar tax credit expired as of January 1, 2026, the full installed cost is what you pay. There is no 30% discount coming off the top. This makes cost-per-watt comparisons and production-per-dollar calculations more important than ever. State incentives (SMART in MA, REF in RI, ADI in NJ) still offset costs, but they vary widely.
For many homeowners, how the panels look on their roof matters as much as the specs. HOAs, historic districts, and personal preference all play a role.
We install only monocrystalline panels because they offer the best efficiency and value. Choose the tier that fits your priorities.
Mono PERC
Budget-conscious homeowners who want trusted brand reliability and maximum ROI.
Mono HJT
Homeowners who want domestic manufacturing, lower degradation, and Propel financing eligibility.
Mono HJT
Homeowners with limited roof space who need maximum production per panel.
The right panel type depends on your roof, climate, budget, and timeline. Here is a decision framework.
Mono PERC (Hyundai 440W)
Lowest cost per watt with excellent 20.3% efficiency. The workhorse choice that maximizes payback speed, especially in New England where temperature losses are modest.
Mono HJT (Silfab 440W or REC 460W)
The lower temperature coefficient (-0.26%/C vs -0.35%/C) saves 5-8% annual production in climates where rooftop temps routinely exceed 60C. Over 25 years, this more than offsets the price premium.
Silfab 440W (FEOC-compliant)
Manufactured in the USA. Required for Propel $0-down solar financing (available in ME and TX). Also qualifies for Section 48E domestic content bonus for third-party owned systems.
REC 460W (premium HJT)
At 22.3% efficiency and 460W per panel, you get roughly 5% more power per square foot than standard PERC panels. Worth the +$0.19/W premium when every panel position counts.
Bifacial monocrystalline
If you are installing on the ground with reflective surface underneath (white gravel, concrete), bifacial panels can capture 15-25% additional energy from the rear side. The premium pays for itself in extra production.
Thin-film (CdTe) or bifacial mono
At scale, thin-film module costs ($1.00-$1.50/W) drive down LCOE. Bifacial ground-mount arrays are standard for utility projects. Residential-scale thin-film is not practical.
Bifacial technology is the fastest-growing segment of the solar panel market, but it is primarily a commercial and utility-scale play. Here is a realistic look at when bifacial panels add value.
Approximate rear-side energy gain based on surface albedo:
White concrete
18-22%
Albedo: 0.55-0.65
Light gravel
12-17%
Albedo: 0.40-0.50
Green grass
5-8%
Albedo: 0.20-0.25
Dark asphalt
2-5%
Albedo: 0.10-0.15
Degradation rate determines how much power your panels produce after decades of service. A 0.25% vs 0.50% annual degradation rate does not sound like much, but it compounds significantly over 25 years.
The financial impact: On a 10 kW system producing ~12,000 kWh/year at $0.28/kWh (MA average), the difference between HJT (93.9%) and PERC (89.3%) at year 25 is about 550 kWh/year, worth approximately $154/year. Over 30 years, HJT panels produce roughly $2,500-$3,500 more electricity than PERC panels.
Monocrystalline panels are the most efficient residential type at 20-23% efficiency. HJT (heterojunction) variants like the REC 460W reach 22.3%. Bifacial monocrystalline panels can achieve effective efficiencies above 25% when rear-side gain is included.
Polycrystalline panels are largely obsolete for residential use in 2026. The price gap has nearly closed while efficiency remains 5-7 percentage points lower than mono. Most major manufacturers have discontinued residential poly lines.
A bifacial solar panel generates electricity from both the front and back sides. The rear side captures reflected light (albedo) from the ground or roof surface, adding 5-25% extra production depending on the mounting setup and surface reflectivity.
Yes, but temperature coefficient matters. Standard mono PERC panels lose about 0.35% output per degree C above 25C. HJT panels like the Silfab 440W have a lower coefficient of -0.26%/C, making them better for hot climates where rooftop temps routinely reach 65-70C.
PERC (Passivated Emitter Rear Contact) is the standard monocrystalline cell type at 20-21% efficiency. HJT (Heterojunction Technology) adds amorphous silicon layers for 21-23% efficiency, lower temperature loss, and better low-light performance. HJT costs about $0.10-0.20/W more.
As of March 2026, installed monocrystalline panels cost $2.50-$3.50/W depending on the brand and state. NuWatt offers Hyundai 440W mono PERC at our entry tier and REC 460W mono HJT at our premium tier.
Technically yes, but bifacial panels offer minimal rear-side gain on flush roof mounts because there is no space for reflected light to reach the back. They perform best on ground mounts or elevated tilted racking with a light-colored surface underneath.
Thin-film panels (CdTe, CIGS, amorphous silicon) are primarily used in commercial and utility-scale projects. They offer lower cost per watt at scale, better shade tolerance, and a sleeker profile, but their 10-13% efficiency makes them impractical for space-limited residential roofs.
Monocrystalline HJT panels have the lowest degradation rate at 0.25-0.3% per year, meaning they retain about 92% output after 25 years. Standard mono PERC degrades at 0.4-0.5%/year. Thin-film degrades fastest at 0.5-1.0%/year.
No. NuWatt exclusively installs monocrystalline panels because they deliver the best efficiency and value for residential customers. We offer three tiers: Hyundai 440W (mono PERC, best value), Silfab 440W (mono HJT, American-made FEOC), and REC 460W (mono HJT, premium efficiency).
FEOC stands for Foreign Entity of Concern. Panels manufactured in or using components from FEOC-designated countries (primarily China) are ineligible for the Section 48E commercial investment tax credit. The Silfab 440W is manufactured in the USA and is fully FEOC-compliant.
No. All-black monocrystalline panels are actually more efficient (20-23%) than the blue polycrystalline panels (15-18%). The black color comes from the uniform single-crystal silicon structure, which is inherently more efficient than the multi-crystal structure that produces the blue pattern.
Our Instant Quote tool lets you select your preferred panel tier (Hyundai, Silfab, or REC) and see real pricing for your home in under 60 seconds.
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This article reflects pricing and technology data as of March 2026. Solar panel specifications, pricing, and availability are subject to change. NuWatt Energy exclusively installs monocrystalline panels across all service areas.