SunPower · Panasonic · REC · Canadian Solar

A no-fluff Connecticut comparison from the licensed installer that puts all four on Connecticut rooftops. Real efficiency numbers, real warranty terms, real CT pricing.

SpecSunPower Maxeon
Premium
Panasonic EverVolt HK
Premium
REC Alpha Pure-R
Premium
Canadian Solar HiKu7
Value
Efficiency22.8% (highest available)22.2%22.3%21.3%
Cell technologyBack-contact MaxeonHIT (heterojunction)HJT (heterojunction)PERC monocrystalline
Panel wattage420-440W410-430W405-420W580-615W (larger format)
Product warranty40 years25 years25 years12 years
Power output guarantee (25 yr)92% at year 25>90% at year 25>92% at year 25>83.1% at year 25
Temperature coefficient-0.27%/C (best)-0.26%/C-0.24%/C-0.35%/C
Shade toleranceExcellent (back-contact)Very goodVery goodGood
Works with Enphase IQ inverter
Works with SolarEdge inverter
Made in USA / allied nationPhilippines (Maxeon cells)Malaysia (assembled)Norway (cells)Canada / multiple
Typical 10-panel installed cost (CT)$28,000-$38,000$25,000-$34,000$24,000-$33,000$18,000-$26,000

Installed cost ranges are Connecticut 10-panel (approximately 4-6 kW) estimates including panels, inverter, racking, labor, permit, and inspection. Excludes roof repairs or electrical upgrades. Last updated May 2026.

Which solar panel is right for your Connecticut roof?

Pick SunPower Maxeon if...

You have a small or shaded roof and need the highest watts-per-square-foot possible. SunPower's back-contact cell design and 40-year warranty make it the choice when panel count is constrained or you want the lowest long-term degradation. It is the most expensive panel in this group.

Pick Panasonic EverVolt HK if...

You want premium HIT heterojunction performance (excellent in cold Connecticut winters) with a 25-year warranty and a name-brand manufacturer. Panasonic panels degrade more slowly than standard PERC cells in cold climates - an advantage in New England.

Pick REC Alpha Pure-R if...

You want the best power output guarantee in the field (92% at 25 years) at a slightly lower price than SunPower. REC's heterojunction cells perform well in diffuse light - common during Connecticut's cloudy fall and winter months.

Pick Canadian Solar HiKu7 if...

Budget is a significant factor and you have ample roof space. Canadian Solar is a proven Tier-1 manufacturer with decades of track record. The larger-format HiKu7 covers more watts per panel, so you need fewer panels for a given system size. Solid value-tier choice for roofs with room.

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Solar Panel Comparison FAQ

Common questions about choosing solar panels for Connecticut homes

What is the most efficient solar panel available for Connecticut homes?
SunPower Maxeon panels currently have the highest efficiency commercially available at approximately 22.8%. This matters most on small or shaded roofs where every square foot of panel space counts. For average Connecticut roofs with enough space, the efficiency difference between premium and value-tier panels translates to a smaller physical footprint, not a dramatically different energy output for the same system size.
Do solar panels work well in Connecticut's cold winters?
Yes - solar panels actually produce more power in cold temperatures than in summer heat because photovoltaic cells are more efficient when cool. Connecticut's issue is shorter winter days and cloud cover, not temperature. Heterojunction panels (Panasonic EverVolt, REC Alpha) have a lower temperature coefficient than standard PERC panels, meaning they lose less output on hot summer days. Both types perform reliably in Connecticut conditions.
How important is the solar panel brand compared to the installer?
Both matter, but installer quality is often more important than brand selection within the premium tier. All four panels in this comparison are Tier-1 products that perform as advertised. The installation quality - proper roof penetrations, conduit routing, inverter sizing, permitting, and utility interconnection - determines whether your system performs and lasts. West Electric handles the full design-to-permit-to-inspection pipeline.
Does Connecticut offer solar incentives regardless of which panel I choose?
Yes. The Connecticut Green Bank Smart-E loan and Eversource/United Illuminating net metering apply to any qualifying solar installation regardless of panel brand. West Electric is an approved CT Green Bank installer and handles Smart-E loan paperwork at no extra cost.
How many solar panels does a Connecticut home typically need?
Most Connecticut homes need 10-20 panels for a 6-12 kW system that offsets 80-100% of typical annual electricity use. Exact count depends on your roof size and orientation, shading, and annual kWh usage. Higher-efficiency panels (SunPower, Panasonic, REC) need fewer panels for the same output. West Electric provides a free custom design and production estimate for every project.
What solar panel warranty should I look for in Connecticut?
Look for at minimum 25 years product warranty and 25 years power output guarantee above 80%. Premium panels (SunPower at 40 years, Panasonic and REC at 25 years with 90%+ output) offer meaningfully better long-term security. The manufacturer's financial stability matters too - West Electric installs brands from manufacturers with multi-decade track records of honoring warranties.