Electrical
On the electrics side I added a two way battery switch and voltmeter to the standard 4 switch panel. This allows me to use/isolate each battery and monitor their condition.
I have also replaced, were possible, the incandescent globes with LED's.
A 20W Solar is the primary source for charging. The outboard has an alternator and I have connected this also for secondary charging, mainly when cruising on overcast days or during night cruises - OK but not as dependable as the solar panel.