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Not 300 watts.
Best I could get was 150 watts under intense Arizona sun trying to bulk charge low batteries. That's with an MPPT controller as well.
Also, the D-ring grommets are very weak. 4 of them have torn off under the panel’s weight. Very flimsy. I haven't found any way to angle these panels correctly on the ground. If you lean them against anything at 45 degrees or so they sag under their own weight. Lots of luck managing these things on a windy day. I would advise anyone to get "rigid" portable suitcase panels instead (like Renogy). They are only rated at 200 watts max but will get you more than this Dokio. I have one of these now and consistently get 13-15 amps from it. I leave it set up 24/7 and just reposition it 3-4 times during the day. They're heavy yes, but can handle just about any wind.
February 2020 · Patio Lawn and Garden · verified purchase