To answer your questions... Yes, yes, and it depends.....
I use solar panels on my boat, to extend the amount of time that I can operate without using shorepower or running the engine to recharge the batteries. Are you looking to use solar power to keep your batteries topped off, re-charge your batteries when anchored out, or to provide you a way to be essentially independent in terms of electrical power. The three goals will have different needs in terms of panel type, size and configuration.
Again... asking a very vague question isn't all that useful. Garbage in--->garbage out...
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.