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Do I need a Galvanic Isolator?
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croakz



Joined: 21 Sep 2020
Posts: 104
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: Jolly Blue
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PostPosted: Thu Feb 10, 2022 11:23 pm    Post subject: Reply with quote

smckean (Tosca) wrote:
Alternatively, I guess you are interested simply using an extension cord that dead ends in the cockpit of your boat. If so, I can see the advantage of what you are looking for. Perhaps the problem is that most of our boats are set up for 30 amps which means the GI has to be pretty big and heavy....too big to fit in an enlarged extension cord connector. Maybe the UK has them since the volts is 240v there and so not so many amps.


I got this from that UK company I posted:

"I'm afraid that we don't do an isolator with NEMA connectors, as NEMAs aren't common over here, but you could easily remove the Euro connectors fitted and replace them with the NEMA types. The isolators are otherwise fine to use in the US, as they will work perfectly well with 110/120V supplies."

But maybe I don't need one according to Pacific Yacht Systems:

https://www.youtube.com/watch?v=JyMvhNmcZZU&t=35
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thataway



Joined: 02 Nov 2003
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City/Region: Pensacola
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C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
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PostPosted: Fri Feb 11, 2022 8:58 am    Post subject: Reply with quote

NEMA is a 50 amp 240 plug used on high loads--electric dryer for example.

There is the NMEA-which is standard sentencing protocol. They use NMEA all over the World.

I have set up several boats using a shore power connector as used in Bass boats, which goes directly to the battery charger, and maybe one outlet. This takes the female end of an extension cord. No galvanic isolator.

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
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croakz



Joined: 21 Sep 2020
Posts: 104
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: Jolly Blue
Photos: Jolly Blue
PostPosted: Fri Feb 11, 2022 9:24 am    Post subject: Reply with quote

thataway wrote:
NEMA is a 50 amp 240 plug used on high loads--electric dryer for example.

There is the NMEA-which is standard sentencing protocol. They use NMEA all over the World.

I have set up several boats using a shore power connector as used in Bass boats, which goes directly to the battery charger, and maybe one outlet. This takes the female end of an extension cord. No galvanic isolator.


Hi Bob,

I should have said NEMA 5-15P and NEMA 5-15R, common extension cord plugs.

For some reason I was hung up on a battery charger constantly plugged in, used like a battery tender, would I need a GI for that, for a boat that is stored on the water. But looks like the answer is no.

Thanks all!

- tom
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smckean (Tosca)



Joined: 18 Jan 2014
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PostPosted: Fri Feb 11, 2022 12:31 pm    Post subject: Reply with quote

Quote:
....battery charger constantly plugged in, used like a battery tender, would I need a GI for that, for a boat that is stored on the water. But looks like the answer is no.

Just be sure that you don't ground the battery charger case/etc to the engine or to any other metal that touches the water.

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croakz



Joined: 21 Sep 2020
Posts: 104
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: Jolly Blue
Photos: Jolly Blue
PostPosted: Fri Feb 11, 2022 12:49 pm    Post subject: Reply with quote

smckean (Tosca) wrote:
Just be sure that you don't ground the battery charger case/etc to the engine or to any other metal that touches the water.


I am fully over my skis now.

shore power -> Victron IP65 charger -> onboard batteries (which are connected to my outboard)

Does my battery charger convert AC ground into the DC neg connected to my battery?

Thanks all.
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