The following are the parameters you should evaluate on:

• Grade – Solar panels come in Grades A, B & C (Grade A being the highest quality)
• Tier of the manufacturer – Organizations such as BNEF have come up with ranking of the solar panel manufacturer, classifying them into one of three Tiers (Tier 1 being the highest)
• Efficiency – Solar panels have efficiencies ranging from 13%-24%
• Performance under low light conditions – Some solar panels can generate higher amounts of electricity than other panels with the same Wp

• Temperature coefficient – Solar panels with lower temperature coefficient (and higher temperature tolerance) lose less of their efficiency at higher temperatures
• Warranties available – Solar panels come with performance warranties, which range from Standard to Linear
• Presence of anti-PID features – Solar panels also come with features to tackle PID or Potential Induced Degradation, a characteristic that can cause significant harm to the panel within the first few years of installation.

You Might Want to Check Out these Questions Too on Evaluation Parameters

• Are There Ratings Available for Solar Panels?-Here
• What Questions about Solar Panels Should I Ask My Installer or EPC?-Here
• How Do I Know I Am Getting the Solar Panels with the Same Specifications as Promised?-Here
• What is the Typical Wattage of a Solar Panel in Watts?-Here
• How Can We Find Out the Grade of a Solar Panel?-Here
• Is it a Good Idea to Use Monocrystalline Solar Panels as They Have High Efficiency?-Here
• How Can I Use Datasheets Provided with Solar Panels?-Here
• Can My Roof Can Take the Weight of Solar Panels?-Here
• What are the Advantages of Having Anti-reflective Coating on the Glass of Solar Panels?-Here
• How Are Solar Panels Tested Before They are Sold?-Here
• What is the Highest Temperature Solar Panels Can Tolerate?-Here
• What is the Temperature Coefficient of Solar Panels? And Why Is It Important for Solar Power Plants?-Here
• What is Peak Capacity of Solar Cells?-Here