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A panel that size doesn't necessarily *NEED* a regulator (though it's not a bad idea), but 2.5 volts is not a charge. Check it again when the sun is out, but if it's got "weird discoloration" and has moisture inside, it's likely shot.
There should be a tag/stamp on the panel telling you it's output.
Any pics?
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S/V Gracie
P303
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