As the boating season draws near if you want to run your boat stereo though a Generator and not worry about dead batteries your going to need one of these (http://www.cascadeaudio.com/prod/powersupp.html)
http://www.cascadeaudio.com/images/aps_2003.gif
And one of these to go with it (http://www.iotaengineering.com/iq.htm)
http://www.iotaengineering.com/Power/iq.jpg
I'm a distributor for the Cascade products and I can save you quite a bit off the retail on these.
To run the APS75 you need the at least the Honda 2000 Generator.
Let me know if you have any further questions.
Rocky