Compare leading solar panel brands side-by-side
Start by filtering panels to narrow your options — use “UK Popular” to see the most commonly installed brands, or filter by tier if you have a budget in mind. Select 2-3 panels using either the dropdowns or by clicking the panel cards below. Hit “Compare Panels” to see a detailed side-by-side comparison including specifications, 25-year projections, and buying recommendations.
Panel efficiency measures how much sunlight is converted to electricity. Higher efficiency means more power from the same roof space. Premium panels achieve 22-23% efficiency, while budget panels are typically 20-21%. For small roofs, higher efficiency panels are worth the premium as they maximise limited space.
Solar panels have two warranties: product warranty (covers manufacturing defects) and performance warranty (guarantees output over time). Premium brands like SunPower offer 25-40 year full warranties, while budget brands typically offer 10-12 year product warranties with 25-year performance guarantees. Longer warranties indicate manufacturer confidence.
All solar panels lose a small amount of output each year. Premium panels degrade at 0.25-0.30% annually, while budget panels may degrade at 0.45-0.55%. This compounds over 25 years: a 0.25% degradation panel retains 94% output after 25 years, while a 0.50% panel retains only 88%. Over a system’s lifetime, this difference can mean thousands of kWh.
Panels lose efficiency as they heat up. The temperature coefficient (measured in %/°C) shows how much output drops per degree above 25°C. Lower (closer to zero) is better. Values around -0.26%/°C are excellent; -0.35%/°C is average. This matters most in summer when panels can reach 60-70°C on hot days.
This standardises panel costs regardless of wattage. Premium panels cost £0.90-1.20 per watt, mid-range £0.48-0.60, and budget £0.32-0.42. For a 4kW system, this translates to roughly £1,300-4,800 in panel costs alone (installation costs are additional). Note that the cheapest panels may cost more over 25 years due to higher degradation.
Brands like SunPower, REC, and Panasonic represent the best available. They offer the highest efficiency (21.5-23%), lowest degradation (0.25-0.30%), longest warranties (25-40 years), and use advanced cell technologies like IBC or heterojunction. Best for: small roofs where space is limited, long-term homeowners, and those prioritising maximum lifetime output.
Jinko, Trina, JA Solar, LONGi, and Q CELLS dominate the UK market. These offer excellent performance (21-22% efficiency) at reasonable prices (£0.48-0.60/W). They come with solid 25-year warranties and are manufactured at massive scale, ensuring consistency and availability. Best for: most residential installations, offering the best balance of cost and performance.
Brands like Risen, Astronergy, and Phono offer lower upfront costs (£0.32-0.42/W) but typically have higher degradation rates and shorter product warranties. They’re still reputable manufacturers meeting international standards. Best for: budget-constrained projects, commercial installations prioritising upfront cost, or situations where panels may be replaced before 25 years.
The most commonly installed panels in the UK are Jinko Solar Tiger Neo, JA Solar DeepBlue, Trina Vertex, LONGi Hi-MO, and Canadian Solar HiKu. These mid-range brands offer excellent value and are trusted by most installers. Q CELLS is also popular for those wanting European-designed panels.
It depends on your situation. Premium panels generate more electricity over 25 years due to higher efficiency and lower degradation. For a typical system, this might mean 10-15% more lifetime output. If you have limited roof space or plan to stay in your home long-term, premium panels often make financial sense. For large roofs where you can simply add more mid-range panels, the value proposition is less clear.
Yes, though some installers have preferred suppliers. Most installers will offer options at different price points. If you have a specific panel preference, mention it when getting quotes. Some installers specialise in premium brands, while others focus on value-oriented options. Get quotes from multiple installers to compare offerings.
LG exited the solar panel market in 2022, though existing warranties remain valid. Their NeON series was highly regarded. For similar premium quality, consider SunPower Maxeon, REC Alpha, or Panasonic EverVolt as alternatives with comparable specifications and warranties.
Chinese manufacturers (Jinko, Trina, JA Solar, LONGi, Canadian Solar) produce approximately 80% of the world’s solar panels and meet rigorous international quality standards. They’re used in commercial and utility-scale projects worldwide. Quality concerns are largely outdated — modern Chinese panels from major manufacturers are reliable and well-tested. The key is choosing established brands with proper UK distribution and warranty support.
The panel comparison tool helps you understand the real differences between the best solar panels and tiers. While premium panels offer better specifications, mid-range panels from established manufacturers like Jinko, Trina, and JA Solar provide excellent value for most UK homeowners. Focus on efficiency if space is limited, warranty length if you’re planning long-term ownership, and degradation rates for maximum lifetime output. Most importantly, ensure your chosen panels are from a reputable manufacturer with strong UK distribution and warranty support.