Their panels have an average efficiency of 21%, which is higher than many other brands on the market. Longi Solar Panels also come with a 25-year warranty, which is longer. These technological improvements have boosted the conversion rates of sunlight into electricity, enabling solar panels to generate more power from the same amount of sunlight. The higher efficiency of modern solar panels means that homeowners and businesses can produce more electricity from their. LONGi Solar, a Tier 1 solar panel brand, offers state-of-the-art solar technology features in their solar modules, including PERC technology. By offering high-quality, reliable products and systems, we provide holistic solutions for the solar and renewables industry. The Hi-MO5 series is known for its high power output.