>
>
> Brian,
>
> Thank you for bringing the "Grounding" question to this forum. I hope
> there is an expert among us who can really nail down how to create a
> ground for electric propulsion. I recommend a ground bus bar wired to
> the underwater metal, ie rudder and steering system and attached a
> ground wire from the negative side of the battery for my ground.
Be very very careful about this if you ever plug into shore power at a
marina. 'Bad things' can happen if you set up a current loop with the
marina earthing system and other boats.
A friend found this web page
<http://www.sailmail.com/grounds.htm>. There is also another web page
out there written by an electrical consultant who was called in to
survey a marina's electrics after a couple of 'unfortunate' incidents
with galvanic corrosion. I can't find it just at the moment.
There is no simple answer - every earthing idea has serious drawbacks.
The main issue is that salt water is very conductive - so when berthed
at a salt water marina, you effectively have an extra wire joining all
the external metal parts of all the boats together. And earth fault in
just one boat can have drastic effects on all those around it.
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