Re: [Amel Yacht Owners] Re: Overcurrent Protection on Winches, Windlass, and Bowthruster
Bill Kinney <greatketch@...>
Kent,toggle quoted messageShow quoted text
Since Don has sold Harmonie to me (Thank you Don and Ann!) I will answer your question.
The fuses Don installed are on the positive terminal of each 24 volt pair of batteries. They are 125 Amp fuses which would allow about a 500 amp draw from the battery bank. Probably one would fail a little below this, since the amp draw from the four 24 volt pairs would likely not be exactly identical, especially at very high draws.
The engine electrical system is protected with a 300 Amp fuse mounted in the same style holder on the engine starting battery.
These fuses are a simple and elegant system for protecting the heaviest wires in the electrical system.
Assuming you take advantage of the full 150% fuse rating over the wire ampacity, a 300 Amp fuse would protect 105 degree C rated wiring down to about 2 AWG (34 mm^2) Smaller wires would still be a risk if not otherwise protected. The four parallel 125 amp fuses (500 Amps total) would safely protect wires 2/0 AWG (68 mm^2) or larger.
Harmonie, SM #160
Port Canaveral, Florida