I've added a few in both staterooms. Getting decent current is an issue for sure.
In the guest stateroom, I added fans to both sides, pulling power from the wall-mount reading lamps. The wall switch for the lights, which have their own independent switches on the lamps themselves, acts as a master for both the lamps and the fans.
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These are very low power so no issue with the wiring.
It helps to have a daughter with you with small hands!
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The master stateroom is a bigger problem. There I have installed another of these same fans, a USB charging outlet, and a small inverter for a new TV. It's not a ton of amps, 5-6A max, but the gauge of wire over that distance is not great, such that the inverter complains sometimes.
I installed a new breaker panel in the closet adjacent to the TV enclosure and ran each of these items to it's own breaker there. The 12V feed was borrowed from the lighting circuit. With all the lights replaced with LEDs, the total current draw on that feed is less than it was with the original bulbs.
I don't have any pictures, unfortunately, but I should be able to get some soon! This is the panel I used:
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I am thinking of running a new, dedicated high-gauge pair of wires directly from the main DC panel to this sub-panel this year. Ideally there is a straight-shot run just under the port side deck to the area where the amplifiers are behind the sofa back. From there it is easy to get to the panel.
Anyone done this or similar already?
Appreciate the detail! I think i'll likely do something similar.