My Bermuda 30 48V 5.5kW Propulsion Marine system has a Blue Sea 225A Class T fuse right next to (less than 7") the positive end of my battery bank. I checked my electric connections at the end of my full throttle run, everything felt cool to the touch. On the other hand the motor and controller were warmer, but I expected that. ;)
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Arby Bernt <arbybernt@...> wrote:
>
>
> Our Ericson 27 48v 5kw AMeP system has three battery locations and three fuses. This protects locations where a pair of conductors can chafe. The more remote batteries have 250a fuses, while the fuse which is easy to reach is 200a. Larger fuses would be better, but larger wire would be required as well. All fuses are mounted to the batteries for heat dissapation. The controller is set for a peak battery current of 150a. West Marine sells the Blue Seas post-style fuses and mounting studs. I've used their double fuse mount to connect battery chargers with 30a fuses. Di-electric battery spray grease is a little messy, but will effectively reduce corrosion.
>
> Run your system at full power for 15 minutes, and check for hot spots. An infrared thermometer is a quick repeatable testing device and a good investment.
>
> Arby Bernt
> Advanced Marine electric Propulsion
>
>
> The Oct/Nov issue of Professional Boatbuilder magazine has an article on
> the design and installation of large battery banks.
>
> In a side bar, the author discussed protection of large banks with Wayne
> Kelsoe, VP of electrical engineering at Blue Seas Systems. Among the
> author's conclusions is that Class-T fuses are preferred over circuit
> breakers for protecting large battery banks.
>
> ..."a common failure mode after a short-circuit fault is for the
> contacts to fuse when reset. How many of us have reset a circuit breaker
> without investigating the cause? If the fault still exists, and the
> over-current protection is compromised, a fire could result. At the very
> least, the breaker will be internally damaged, and will not reset,
> allowing the circuit to remain open. Boat operators often carry spare
> fuses, but how many carry spare primary circuit breakers?"
>
> Anybody in the group had any experience with the type of circuit breaker
> failure that Wayne is talking about?
>
> -Tom
>
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