T-Pain Is On A Boat: Re: [Electric Boats] Shore power

Wednesday, August 28, 2013

Re: [Electric Boats] Shore power

- if you have a flexible coupling (most will have) you put an electrically conductive strap (braid is good and it doesn't fatigue) across the flexible coupling (jubilee clip each side sounds rough but it works) so both sides of the shaft are at the same potential.

- i could not work out where the radio interference came from in a system with no brushes or other sources of spark/discharge which disappears when you brush earth your prop shaft and bond across a flexible coupling.

- i now think it might be from the 'electric etching' that occurs across/between the motors ball bearings from the induced field/voltage that occurs in most motors, so the brushes and shaft bonding will help eliminate this too.

cheers

On 28 August 2013 20:51, Kirk McLoren <kirkmcloren@yahoo.com> wrote:

All incoming power from the shore is on a ground fault interrupter isn't it?\

If not it should be.

From: Fred Liesegang <fred4936@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>

Sent: Wednesday, August 28, 2013 10:07 AM

Subject: Re: [Electric Boats] Shore power

Thanks to all for the links and info! I will have to do something about a ground! The one thing I'm having trouble understanding is since the prop shaft is isolated (I have a flexable coupling), how can the current get to the water? I certainly do not want to create any sort of shock hazard, I just need to understand what is going on. If i do incorporate a grounding plate of some sort (maybe a thru-hull fitting), then there is ia definite path for the current to go. Is that the idea?

Fred

From: Carter Quillen <twowheelinguy@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Tuesday, August 27, 2013 11:39 AM
Subject: Re: [Electric Boats] Shore power

Fred,

Confusing subject with lots of "opinions" when you ask around but I would refer you to a link that was recently offered on this forum.

http://www.smartgauge.co.uk/earthing.html

It is about the best information resource I have seen on the subject and offers some straight talk with eye opening examples.

Carter

http://www.shipofimagination.com/

From: fred4936 <fred4936@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, August 27, 2013 7:46 AM
Subject: [Electric Boats] Shore power

Hello Everyone, I'm putting s proper shore power system in my boat, which should make life easier and safer! I read an article from Don Casey about installing shore power systems, and he says to connect the green ground to the engine block. I no longer have an engine block, so that option does not exist. Both the 48v and 12v DC systems are floating, and I was going to make the 120v AC system the same. My prop shaft is also electrically isolated. I was curious as to how others handled this. Thanks to everyone in advance! Fred Liesegang Tartan 27-2 "Eagle" ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/electricboats/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/electricboats/join (Yahoo! ID required) <*> To change settings via email: electricboats-digest@yahoogroups.com electricboats-fullfeatured@yahoogroups.com <*> To unsubscribe from this group, send an email to: electricboats-unsubscribe@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/