Re: [Liveaboard] Batteries

2010-11-24 Thread Ben Okopnik
On Wed, Nov 24, 2010 at 04:30:49PM -0500, Kris Coward wrote: > > What about the possibility that some of the cells were leaking together? *That*, now, is a possibility. If you have, say, a shorted cell _and_ communication between cells, then the hydrometer would show a normal state of charge... t

Re: [Liveaboard] Batteries

2010-11-24 Thread Ben Okopnik
On Wed, Nov 24, 2010 at 01:28:48PM -0800, Jim Richardson wrote: > > Maybe there was a physical obstruction such that when you pull a > sample with a hydrometer, it was only sampling from a small volume, > which was correctly charged, but the rest of the electrolyte was > separated (electrically an

Re: [Liveaboard] Batteries

2010-11-24 Thread Ben Okopnik
On Wed, Nov 24, 2010 at 02:54:39PM -0500, banders...@earthlink.net wrote: > > Yes, a shorted cell will be very watery. And, as I remember, soot sucked > up into the hydrometer too. As soon as I disconnected that battery pair, I popped a couple of the caps to see what I could see. The acid in the

Re: [Liveaboard] Batteries

2010-11-24 Thread Kris Coward
On Wed, Nov 24, 2010 at 01:28:48PM -0800, Jim Richardson wrote: > On Wed, Nov 24, 2010 at 11:54 AM, banders...@earthlink.net > wrote: > > > > Yes, a shorted cell will be very watery.  And, as I remember, soot sucked > > up into the hydrometer too. > > > > Interesting to hear that there is a moveme

Re: [Liveaboard] Batteries

2010-11-24 Thread Jim Richardson
On Wed, Nov 24, 2010 at 11:54 AM, banders...@earthlink.net wrote: > > Yes, a shorted cell will be very watery.  And, as I remember, soot sucked > up into the hydrometer too. > > Interesting to hear that there is a movement away from Trojan in the > "off-grid" folks.  Will have to keep an eye on th

Re: [Liveaboard] Batteries

2010-11-24 Thread banders...@earthlink.net
Yes, a shorted cell will be very watery. And, as I remember, soot sucked up into the hydrometer too. Interesting to hear that there is a movement away from Trojan in the "off-grid" folks. Will have to keep an eye on that. "Shotgunning" sounds familiar; they called it "Easter Egging" the last t

Re: [Liveaboard] Batteries

2010-11-24 Thread Ben Okopnik
Hi, Ron - On Wed, Nov 24, 2010 at 01:35:29AM -0500, Ron Rogers wrote: > Why did the alternator throw sparks? I'm guessing that when the battery failed, one or more cells shorted and resulted in a huge load on the alternator, and the sudden mechanical load caused the mount to flex and the external

Re: [Liveaboard] Batteries

2010-11-24 Thread Jim Richardson
On Tue, Nov 23, 2010 at 10:35 PM, Ron Rogers wrote: > Why did the alternator throw sparks? Should a shop check it for > damage? I assume that you are using an external regulator. A device to > cause the start battery to charge first would be appropriate. A Group > 31 should be adequate to start th