Should I Replace My Roof Before Adding Solar Panels?

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I have asphalt shingles on my home that are 30 years old.  I have no leaks - just some moss/mildew on the current shingles as I live in a moist environment (Hawaii).  I am considering putting solar panels on the roof and have been advised to re-roof beforehand due to the roof's age. 

The roofer I consulted advised me that I could save money by simply covering the existing shingles with a layer of new asphalt shingles.  Is this advisable? What do you suggest?

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