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>Posted on 23 Sep 1996 at 15:40:19 by david (d.p.) pearson >My thoughts in no particular order: > >o If an extremely large current is drawn from a lead-acid battery, > the danger of explosion is very real. In an umbilical lamp, the > possibility of shorting the battery exists. The risk is reduced > by keeping the wire short and neat as demonstrated in your video. A secondary issue along the same line is the observation that under large discharge currents the battery plates in some batteries will buckle and short. Further the umbilical itself and the case/umbilical seal could fare poorly when the conductors heats up during a short. One more point is that if the batteries are charged while in a sealed chamber and you have AGM batteries in thermal run-away and/or a shitty/faulty charger a fuse could save the day too (if it's not sized for "very high currents" that is). >o The fuse need not be a cheezy "Little-Fuse" stuck in a holder > with lousy springs to make contact. The fuse could be a very > high current fusable link soldered directly into the circuit. >o The light should be considered life support equipment. The > fusing should be given the same treatment as burst disks; size > them so they blow just before the tank/battery explodes. I don't get your argument for why the fusable link should be sized much larger than the load current should you elect to go with a fuse. Are you saying you do consider the fusable link a *weak* link ? If yes are you sure you want it in the circuit ? :-). Regards, John
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