You could convert to a gas (propane or kerosene) refrigerator, It may be
less expensive than generator power, and will run while under way. If you
use gas for cooking, it would not be too inconvenient.

Combination gas/electrics are also available.
http://www.gasrefrigerator.net/
(for examples)

Have you considered running your power on a timer, so the beer is only
chilled for say, 12 hours before you come aboard?


Pepperoni



wrote in message
...
Hi,

I have a large refrigerator on a houseboat, and don't want to
replace it with a less convenient one since the vast majority
of the time it's connected to AC shore power at the dock. I
like to go out for a couple days a week, and could *greatly*
reduce the amount of time the generator runs if I can find a
good way of getting the refrigerator to stay cold longer. Are
there any good cold packs for keeping refrigerators cold,
that can be re-frozen over and over again?

Thanks for any help!
David