I am trying to find a couple cheap but still decent solar panels to play around with charging my river pro 2 battery. I see fixed panels that are decently large 200 watt panels for like $200 to $300 or more. Then there are 2 x 400 watt flexible panels (likely china stuff) for like $259. being flexible would be nice of course, but I am wondering do they really ALSO put out 200 watts each on par with fixed panels? If they do put out similar output to the more expensive fixed panels.. are they durable or are these likely to burn out and have issues or something in a year? The EcoFlow panels are like 3x the cost.. so just trying to understand what I can get.. what sort of bang for buck and durability they are.