On 05/04/12 08:55, Eric wrote:
>
> There should be no problem connecting the 12V house side to earth/sea-water ground to follow the ABYC recommendation. As Tom pointed out, ABYC says that doing that is "allowed, but not required".
>
> Here's my summary answer again, "So 2) do not connect your 48V battery bank to boat ground, leave it floating. And 3) yes, only house DC bonding and AC safety ground are connected to boat ground."
>
> Last of all, my opinions are just that. I am not a marine professional, I am what most would call an interested amateur. Thoughts expressed by me do not necessarily represent the positions of Yahoo groups, the Electric Boats group as a whole, or the ABYC. :)
>
What to ground in a boat is a nasty problem even with out an electric
drive - the electric drive is usually a higher DC voltage so can
'multiply' the problems. But it is a can-of-worms even electrical
engineers argue about.
It can become quite nasty in marina's where many boats spend a lot of
time plugged into the marina shore supply. Cathodic damage is generally
caused by DC currents leaking, not AC currents. Electric boats with high
current chargers are an obvious point to be 'scared about', as if you
get a leakage to earth from that charger, quite high DC currents could
be flowing through the water around the marina and doing all sorts of
nasty stuff. Same bad things an improperly grounded/isolated house
charger could do as well, just much faster...
(On the other hand some of the boats in the local marina probably have
house loads that are several times my boat's traction load!)
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