I am designing a remote off grid radio repeater site. I am looking for a 300w panel or equivalent to mount on my antenna tower. I see these small panels on ebay (tatoodaa, eco-baerrs) advertised as 300w, but they are the size of a typical 200w panel. Does anyone have any experience with these panels? I'm tempted by the price ($210 with free shipping). I do not see how this could be a true 300w panel.