Lee.
Thanks for the GREAT information on the care of batteries by professionals
whose lives depended on them. You can't get better information than that!
I do have some more questions.
How was the State Of Charge determined. I know that my AH meter accumulates
errors and that my hydrometer is the final word. Did the submariners rely on
an AH meter or did they dip the hydrometer or both.
You mentioned they "jumpered" bad cells. How many cells were in a string. It
must have been many to tolerate taking some out of the string. Did they carry
spare cells to replace the ones jumpered. I imagine they were quite large and
hard to move, but there could have been "spares" installed at the end of a
string that could be maintained by a special charger and jumpered in as needed.
How did you determine the discharge rate to do the capacity test.
What did you do with the gasses when equalizing. Did you burn them or store
them or what? What rate did you equalize at and for how long?
I would love to get a decade out of my house batteries.
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
----- Original Message -----
From: LA Licata
To: [email protected]
Sent: 11/18/2008 12:30:58 PM
Subject: Re: [Liveaboard] Submarine Battery Discharges
Hi!
On nuke subs, we tricked discharged our lead acid battery bank at 5 amps every
hour for every day when the battery was not being used as a power source. When
used as a power source, after the event, the electrician on watch at the
electrical panal would get permission and commence a "normal" battery charge to
get the amps taken out back in.
Once per month, we discharged it to 50% of CALCULATED capacity at a controlled
discharge rate and recharged it normally to verify calculated capacity.
Every 6 months we did a test discharge (after inspection and water level check)
from 100% capacity to verify that it operated per designed, as compensated for
any cells jumpered, and then equalized it. We then reran the capacity number
checks.
While the distinction between the data collected may appear to be small, it is
not
This is my memory serving me. the time frames can be wrong, but I do not think
so.
If I also remember, we tended to do the equalizers at sea as the the motor
generators could easily really "reach and maintain ordered amps" that was
needed at the start of the equalizer.
Only the reactor got more care and better feeding than the battery. And,
batteries lasted a real long time, like decade ++++
Lee
On Nov 16, 2008, at 1936, Lee Haefele wrote:
The Submarine battery discharge may have been to test the batteries rather than
to cycle them to improve them. If you need more I will ask my wife's uncle who
was a submarine electrician in WW2.
Lee Haefele
----- Original Message -----
From: Norm of Bandersnatch
To: [email protected]
Sent: Saturday, November 15, 2008 10:26 AM
Subject: Re: [Liveaboard] Battery Discharge Depth
They (Home Power magazine) say for the best longevity/usefulness discharge deep
cycle batteries no deeper than 50% of the battery bank's rated capacity and the
less the better.
There was a report from a submariner on the List that the manufacturer of the
batteries in his submarine specified that the batteries be discharged to a
certain point and recharged periodically if they were not done so by
operational activities.
I use an E-Meter, a round (about 2"), Amp hour meter that can show Volts,
Amps, Amp hours, and percent discharge. I made a hole in my Trace front panel
and mounted it there.
Question: I know we capitalize Volt, Ampere (and Amp), Watt, Ohm and Hertz
because they are people's names, so shouldn't Amp hours be Ah, not AH as we
usually do? I use DCV and acv like that because that's what they do in Home
Power magazine.
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
----- Original Message -----
From: Lee Haefele
To: [email protected]
Sent: 11/15/2008 9:45:11 AM
Subject: Re: [Liveaboard] Electrical systems install
If you run your batteries all the way to dead, you will shortly need new ones.
I know a standard car battery is ruined in about 3 total discharges. Suggest
installing a battery monitor, so you know when to charge and when it is
economical to stop.
Lee Haefele
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