Yes the power necessary start to be slightly higher than anticipated. I thought the 20hp Listeroid two cylinder will fit the bill. The power beside the motor, is quite intermitant, the lights obviously part of the night, and that its not much consumption , the nav station run in 12DC volt, and the fridge, which is a isolated box with cool plates doesn't ask for much energy. The hot water and the heating system will come from a diesel stove with a gravity system. No power necessary there.
But it still a work in progress, and having everything from the same main power source will be really nice.