: Measures how much sunlight is converted to power; higher efficiency is critical if you have limited roof space.
: In hot climates, look for a lower coefficient (e.g., -0.24% to -0.3% per °C) to minimize power loss on high-temperature days.
Expert reviews from EcoWatch and FMB highlight several standout options: How to Choose the RIGHT Solar Panels for Your Home
: Most panels lose 0.3% to 0.8% efficiency annually. A lower rate (e.g., ≤0.3%) ensures your system still produces significant power after 25 years.