I've only had my Renogy Flexible 160W panels for a year now. I have a pole building for my coach so it will not be abused by the weather 365 days a year so I am not too worried about them lasting.
That being said..... technology is changing rapidly and they will only get better and less expensive. The 160W panels were the biggest they made. Now Renogy has 175W panels.
That's why I made mine easy to remove. If I need to replace them, it should not be too hard to swap them out if / when the time comes.
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