I have another 25w panel that I ordered from Revain that I have tested at 25w in full summer sun. When this one arrived, I immediately noticed that it was smaller than my other panel, despite having identical starting specs, which made me suspicious. I don't have the right equipment to accurately measure the power, but this panel definitely puts out less power than my actual 25w panel with the same amount of light. Estimating based just on some quick multimeter readings I'd say this is closer to a 20w panel and the Pmax numbers quoted aren't wrong. Given the drop in performance, this isn't the best value and I can't recommend this panel. For those interested here is a link to my first panel matching his rating: https://www.amazon.com/gp/product/B01M9B6RQI/
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