Hi Chris,
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. :)
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Chris Hudson <clh5_98@...> wrote:
>
> Eric,
> I just re-read your first reply on this topic. So, the 48 Volt side should be isolated from boat ground. The 12 Volt house side is isolated from the 48 Volt side via the isolated DC/DC converter(s). What would be the problem of then connecting the 12 Volt house side to earth/sea-water ground to follow the ABYC recommendation? Seems like per your answer to my question 3 was to not connect the house side to earth ground.
>
> Chris
> --- On Wed, 4/4/12, Eric <ewdysar@...> wrote:
>
> From: Eric <ewdysar@...>
> Subject: [Electric Boats] Re: DC/DC Converters
> To: electricboats@yahoogroups.com
> Date: Wednesday, April 4, 2012, 2:24 PM
>
>
> Hi Chris,
>
> For now, ABYC's TE-30 says "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."
>
> So I would say that as long as the propulsion electrical system and the house electrical system are isolated (don't share the same ground) then you should be OK. Of course ABYC recommends connecting the house electrical system to an external ground, usually the prop shaft, but I have not done that on my boat. My prop shaft is electrically isolated from the motor and gear reduction case via my flex coupling.
>
> 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.
>
> Fair winds,
>
> Eric
>
> Marina del Rey, CA
>
No comments:
Post a Comment