Up to 25% conversion rate. Charge faster with an even smaller panel. With the introduction of TOPCon solar technology, a first in the mini portable solar panel industry, we've set a new standard for conversion efficiency, achieving 25%. This enables faster charging in a more compact form. Fully charge RIVER 2 in 7 hours during peak sunlight hours, and power your electronics and essential camping appliances for a longer adventure. | Ecoflow | | Foldable 45W Solar Panel | Black | Best Buy