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I purchased 2 panels 20 years ago.
They both still work.
However in that time have had 3 sets of batteries and 4 cheap two stroke gennys and 2 good 4 stroke gennys and 2 inverters one of which still works.
Off grid is expensive and very high maintenance.
You need to keep panels.clean and battery maintenance required topping up water and keeping terminals clean.
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