Tier 1 and Tier 2 solar panels are classifications used to distinguish solar panel manufacturers based on their financial stability, production scale and reputation. These tiers are not about panel performance specs, but rather the credibility and track record of the companies behind them. The solar panel manufacturer tier system was developed by Bloomberg New Energy Finance (BNEF) to identify major, bankable solar panel brands in the solar industry.
Tier 1 panels are produced by well-established manufacturers like LONGi, Trina, and Canadian Solar. These companies use fully automated, vertically integrated processes and invest heavily in R&D (research and development), and back their products with strong 25-year warranties.
Tier 2 panels, while more affordable, are made by smaller or less experienced firms that rely on partial automation. Their products often carry shorter warranties, greater variability in quality, and a higher risk of performance issues over time.
Tier 1 panels are more expensive but offer consistent quality and better long-term performance, while Tier 2 panels are great for budget-conscious buyers or residential installs where upfront cost is the key concern.
Solar panels also have a Tier 3 category, which includes the least established manufacturers with minimal automation, lower reliability and the highest risk of defects.
Tier 1 solar panels are solar modules produced by manufacturers that have been classified as Tier 1 by independent industry analysts such as Bloomberg New Energy Finance (BNEF). This classification is considered the highest (best) tier and is based on a manufacturer’s proven track record, financial stability and ability to consistently produce high-quality panels.
Some popular Tier 1 solar panel manufacturers include Canadian Solar, Trina Solar, Jinko Solar, LONGi Solar and Maxeon (formerly SunPower). They offer high efficiency, robust warranties (up to 25 years) and are preferred by banks and investors for large-scale projects due to their proven track record and bankability.
The Tier 1 solar panels list is shown in the image below.
Tier 2 solar panels are solar modules manufactured by companies that do not meet the strict criteria required to be classified as Tier 1 manufacturers. BloombergNEF, the organization most recognized for defining Tier 1, does not provide official criteria for Tier 2.
Some commonly cited examples of Tier 2 solar panel manufacturers include RenewSys Solar, Luxor Solar and Axitec Solar. These panels use partial automation with more manual labor which leads to a slightly higher risk of defects and less consistent long-term performance.
The differences between Tier 1 and Tier 2 solar panels center on manufacturer reputation, financial stability, production scale, quality control, warranty strength and long-term reliability.
Tier 1 panels offer superior reliability, better warranties and consistent performance at a higher price, while Tier 2 panels are more affordable but carry greater risk regarding quality, long-term performance and warranty support.
The table below highlights the differences between Tier 1 and Tier 2 solar panels.
Features | Tier 1 solar panels | Tier 2 solar panels |
Manufacturer criteria | Manufacturers are strictly bankable, large-scale and highly reputable. | Manufacturers are less established, smaller or do not meet Tier 1 criteria. |
Manufacturing process | Production is fully automated and vertically integrated. | Production is partially automated and not always vertically integrated. |
Financial stability | Manufacturers are financially robust and often publicly listed. | Financial stability is lower; manufacturers may not be publicly listed. |
Warranty reliability | Warranties are highly reliable and backed by strong financials. | Warranty reliability is variable and less certain. |
Quality | Quality is consistently high and rigorously controlled. | Quality varies, with a higher risk of defects or performance issues. |
Price | Panels are more expensive, reflecting higher quality and reliability. | Panels are less expensive, 10 to 30% lower than Tier 1. |
Tier 1 panels offer superior quality, reliability and warranty support which makes them ideal for those prioritizing long-term performance and peace of mind. They are best suited for large-scale or high-budget projects and harsh environments.
Tier 2 panels, on the other hand, provide a more affordable energy option and can be a good fit for budget-conscious buyers or those with modest energy needs, but they come with greater risks regarding quality, warranty support and long-term performance.
Choosing between Tier 1 and Tier 2 depends on your budget, energy requirements and willingness to accept trade-offs in reliability and long-term support.
The advantages of Tier 1 solar panels compared to Tier 2 are outlined below.
The advantages of Tier 2 solar panels compared to Tier 1 are outlined below.
Solar panels are classified into three main tiers including Tier 1, Tier 2 and Tier 3 solar panels based on the manufacturer’s reputation, financial stability, production capacity and the degree of automation and vertical integration in their manufacturing processes. Tier 1 offers highest reliability and warranty support; Tier 2 balances cost and quality; and Tier 3 is most affordable but riskiest for long-term performance.
The different tiers of solar panels are given below.
Tier 1 vs 2 vs 3 solar panels comparison is visualized in the image below.
Yes, tier 1 solar panels are worth it because they come from financially stable, reputable manufacturers with proven quality, reliability and strong warranties often lasting 25 years or more. They offer higher efficiency, durability and lower degradation rates for better long-term performance and peace of mind despite a higher upfront cost which is 10 to 30% more that Tier 1 solar panels.
Tier 1 solar panels last 25 years or more, with a low degradation rate of about 0.30% per year. They usually retain around 93% of their original efficiency after 25 years, meaning they still perform at high capacity well beyond two decades. Their durability and warranty support make them a reliable long-term investment.
To know if your solar panels are Tier 1, check if the manufacturer is financially stable, publicly listed and oversees the entire production process. They must also have supplied panels for at least six 1.5 MW (1,500 kilowatts) or more projects funded by six different banks through non-recourse loans within the past two years. Tier 1 reflects manufacturer bankability, not just panel quality.
Yes, Tier 1 solar panels are 10 to 30% more expensive than Tier 2 panels due to their superior brand reputation, advanced technology and better warranty support. This price premium reflects higher quality materials, rigorous manufacturing standards and greater reliability over time, making them worth the extra cost for many buyers.
Companies that are recognized for financial stability and large-scale production manufacture Tier 1 solar panels. Leading Tier 1 manufacturers in 2024 and 2025 include LONGi Solar, Jinko Solar, JA Solar, Canadian Solar, Trina Solar, First Solar, Maxeon (SunPower), Risen Energy, Vikram Solar and BYD. These brands are noted for reliability and industry reputation
Yes, Tier 2 solar panels are reliable but come with more variability in quality and shorter, less dependable warranties compared to Tier 1 panels. They are produced by smaller or newer manufacturers with less rigorous testing and lower financial backing, which can affect long-term performance and warranty support. They can be a cost-effective option for budget-conscious buyers or less demanding applications.
The warranty terms for Tier 2 solar panels are between 10 and 20 years, shorter than the standard 25-year warranties of Tier 1 panels. Their efficiency warranties often guarantee performance with a maximum degradation of about 2 to 3% in the first year and around 0.5% annually thereafter, but warranty support may be less comprehensive or reliable than Tier 1.
Tier 3 solar panels are the lowest quality category of solar panels produced by young, less-established companies with limited resources. They have lower efficiency, shorter lifespans, higher defect rates and less reliable warranties.
Manufacturing of Tier 3 solar panels is manual with minimal automation and no significant research and development investment which makes them the cheapest but riskiest option.
The best type of solar panel in 2025 is monocrystalline, known for its highest efficiency of 20 to 25%, long lifespan of 30 to 40 years, and strong performance in limited space. Leading solar brands like Maxeon offer panels with efficiencies up to 24% which makes them ideal for maximizing energy output and durability despite higher cost.
