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Personally I would scrap it and install a new panel. Those things have a limited life span, most new panel manufacturers today only warrant them for 12 years, and will likely adversely affect the new panel if you add one to the system, in the same way an old battery can hold down a new one when connected to a bank. Even a great crystaline panel will lose 1% of its effeicency each year, film panels only last 2-5 years.. Btw all panels usually have a sticker on the rear that describe the rated output.
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