Work well,.... but
I have used the Igloo 36 quart cooler, which I still have.Dockside, using the 12V charger on the battery (the cooler draws somewhere around 4 amps) it worked fine when the stuff in it was allowed to cool all night. It actually FROZE the quart of milk we had put in it for breakfast! If left on for a good long time, it does cool things quite well. However, my cooler started making a rather loud noise... I think the bearings in the motor are starting to go. My wife can't stand the noise on the boat or in the car. We are contemplating buying another one, but, since our "new" boat does not have an alternator nor do we carry a generator, at present, the 4- 4.5 amp requirement underway is a bit sticky, in my opinion.If you have an alternator, dockside power or an aux generator, this will work for you (till your bearings make noise, that it!)Steve