We also have 32000 btu's on a 51 ft boat. Most of the time ,even at a dock
we only use about 21000 by only cooling
the master, and saloon/galley, and pilot house if needed. no sence cooling
places we don't sleep in or use much! we have so little other 110 on board besides AC, that a 30 amp service
covers our useage at dockside !So we are lucky! At sea our 7.5 genny handles all the power needed for all our 110 equipment
. Personaly we look for AC before we even look at anything else on a boat add ! But we live on the gulf coast
and need ac 7 months of the year!! And of course we are OLD and like to sleep cool !!