The "Pelletier" effect coolers are useless in really hot weather, as they can only cool a certain amount from the ambient temperature. They are also hugely inefficient. Using a "walmart" refrigerator and inverter is probably not a great idea, as the refrigerator is probably not insulated well enough for use on a boat—most small refrigerators make the assumption that they'll be used in a controlled climate area, and a boat is generally not one. A truck, like the one that Gregpecaut, can afford to run the A/C, which is often not the case on a sailboat, if it even has A/C at all.
Also, you have the inefficiency of converting the DC to AC using the inverter...if you don't think they're inefficient, just touch one that's been running a while and see how hot it is... that heat is electricity that has been converted.
Best small refrigerators for use on a sailboat are probably the Engel "Swing compressor" units. I've used one and they're very efficient. Most are top-loading designs, which helps keep the cold air inside the box when you have to open it.
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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.