I stand corrected then, but unrepentant. Thanks for the reference.
---In electricboats@yahoogroups.com, <james@...> wrote :
For 48 volts and less, I follow the ABYC E-11 recommendations and have a common ground between all systems. At higher voltages ABYC TE-30 says keep them separate.
I personally went with a 48 volt system because I wanted to be able to have a common ground. I don't like having different potentials between different systems that I or a swimmer nearby could be a bridge path between.
More important then if you bridge the two DC grounds together, make sure your old AC system still has earth ground. Most marine systems used the engine block via the shaft to ground to earth. If your boat does not have another path, once you removed the old engine your entire ground system may be isolated from earth.
If so a cheap 35 dollar shaft brush will re-earth your system. See my earth ground bellow:
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