When I first bought my boat, she was very, very basic-
Atomic-4 with an alternator, the basic navigation and cabin lights, and two DC outlets that resemble AC outlets, for portable DC lights and accessories.
First thing I've done is find a great, 6 watt solar panel from Bacon Sails, to keep the batteries topped up when away from the dock.
Next, I installed a Marinco 30 amp shore power inlet, and ran 9' of 10/3 AWG wire to the proposed breaker location.
Yesterday, I finally installed an 8 position (plus main) Blue Sea Systems AC breaker panel.
The install is pretty clean so far. The wiring is properly supported, proper gauge, proper length, and chafe-protected. The final steps are to install three branch circuits, and an onboard battery charger.
Best of all, I was intelligent enough to measure everything out to upgrade from the original Pearson DC panel, to a better, Blue Sea Systems DC panel in the future.