I also have seen some interesting wiring systems on boats and when asked to go beyond our motor installation, I normally tell the client to get an ABYC certified electrician.
Most of the members of this blog have installed motor systems at 48v. On our systems, we insist on an appropriate T fuse within about a foot of the batteries positive side to protect the motor, controller, wiring, and batteries. I know some systems have a fuse on the Sevcon controller and we do not see that as a protection to any of the other components of the system and are likely not approved by ABYC or CG.
I also have a healthy respect for 12v as I have seen terminals melted as they sunk into the battery.
Mike
Electric Yacht So Cal
--- In electricboats@yahoogroups.com, Steve Dolan <sdolan@...> wrote:
>
> Mike,
> It's not recommended to "TAP" or run wires from the batteries. You're better off running a terminal strip for "accessories" off the batteries (both + and -) to a safe location near by with an in-line fuse. I recently was asked to look at a dock buddies wiring and backed away from a bank of bats that had each circuit wired directly to the batteries. All told over 20 wires off the terminals of the batteries with individual fuses to only half of them. With a 144V system I like rubber gloves and insulated tools. :o)
>
> Steve in Solomons MD
>
> Well, while I was adding some terminals for a new helm instrumentation project one if the battery interconnect cable lugs touched the post of the battery next to it for under a second. Thought this group would like to see the result:
> http://biankablog.blogspot.com/2012/10/mistakes-of-electric-sailor.html
> Not great harm but, it certainly got my attention. Just a reminder to be careful around those batteries.
>
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