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The d3-k1 runs on 5V DC supplied by a USB-C power adapter connected to your boat’s 12V system. Here is how to wire it correctly so the Pi receives clean, stable power.
Use a marine-grade DC-DC converter. Do not power the Pi from a standard USB phone charger plugged into a 12V socket. Boat electrical systems have significant voltage fluctuations — spikes during engine start, sags under load. A marine-grade DC-to-DC USB converter (such as the Blue Sea 1016 or equivalent) is regulated, filtered, and rated for the voltage range of a 12V boat system (10V to 16V). It keeps the Pi’s supply voltage within the 4.75V–5.25V range the Pi requires.
Dedicated circuit. Run the d3-k1 power on its own circuit from the distribution panel — do not share it with other equipment. Other devices cycling on and off on the same circuit cause voltage fluctuations that cause SD card corruption on the Pi over time.
Fusing. Fuse the d3-k1 circuit at 3 amps. The Pi 5 draws a maximum of approximately 5W at full load through the DC converter. A 3-amp fuse protects the wire; a smaller fuse will nuisance-trip during boot when all services start simultaneously.
Where to mount the power converter. Mount it inside the d3-k1 enclosure or in a nearby dry, ventilated location. Keep all connections to the converter inside the enclosure — do not run unprotected wire to an external USB socket.
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