One of the NoCo reviews mentioned a problem with the charger shutting down because of the refrigerator load when on shore power when away from the boat. Do you have any experience with that situation?
A standard galvanic isolator circuit needs no power, it would only install inline with the ac ground from shore power. I use this one: https://yandina.com/products/50-amp-galvanic-isolator
I monitor it manually with a voltmeter.
These cables are useful because the only difference between Raymarine SeaTalk NG and NMEA 2000 is the connector. My hub is SeaTalk NG because I started with Autohelm. I send heading from Autohelm to the Garmin chart plotter, and depth from chart plotter to Autohelm. AIS from Standard Horizon...