I have the Honda 2000eu portable genny and love it. We use it on the 97' 2800 scr and it is capable of running everything but the a/c at the same time. Or the a/c and charger only! I have a 9000 btu a/c and the start up amps are not high enough to trip the genny. You should be fine with the drop in.
Check with multiple Honda dealers and also check online at honda power equipment
http://www.hondapowerequipment.com/p...elid=EU2000IAN
They normally run the 12 months no payments / no intrest deal a couple of times per year, and most of the dealers will give you this deal away. Great Genny, you would really like it, very quiet too.
I normally place the genny in my zodiac at night and tie it down so it cannot tip over or turn. Otherwise, just throw it on the swim platform. Plus I recommend a GOOD CO detector for anyone using a gen set of any type! Be safe!
As far as using in salt water, if you are going to keep it in the water all the time then you are going to need the bottom painted with a good Ablative bottom paint (Micron CSC is what I use, expensive but lasts a couple of years at a time.) If you dry sail it or trailer it, just fresh water rinse and wash it every time you use it. I would also make sure that you have good zincs on the drive unit, saltwater will accelerate the normal corrosion you get (Especially if you have a SS prop.) If your motor is raw water cooled you will also want to purchase a flush kit and flush the drive and cooling system if the boat is going to sit for any length of time out of the water. Saltwater is very harsh on the boat, motor, and drive if you dont take preventative actions. Very costly too!