On my launch I keep my 12V system isolated from my 48V bank. I use an isolated DC-DC converter and separate negative buses.
From ABYC TE-30 2009-2010:
GROUNDING
The boat's propulsion electrical system (e.g. batteries, generators, inverters) should remain isolated from the boat's grounding system.
Non-current-carrying conductive parts of the propulsion system (e.g. motor case) should be tied into the boat's grounding system per ABYC E-11, AC & DC Electrical Systems on Boats.
I realize that TE-30 applies to systems operating at more than 50VDC, but wouldn't the same logic apply?
Besides, there is so little voltage sag on my lithium bank that in six years of operation I have never run below 50V. :)
-Tom
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Posted by: boat_works@yahoo.com
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