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Open Roads Forum  >  Tech Issues

 > Proper AGM Charging - help - battery specification gurus

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HiTech

Texas

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Posted: 01/25/13 12:02pm Link  |  Print  |  Notify Moderator

The specs for my Deka 8A27M Group 27 Marine batteries are:

Bulk 30% of C (20 hour rate) at 1.75 vpc (volts per cell) OR 6 times I20 at the same cell voltage (no idea what I 20 is?)

Absorption 2.35-2.40 vpc until charge in current < 0.10A per Hr/ Max Time 12 hour (I'm not really sure what 0.1 amp per hour means?? Is that .1 amp per amp hour capacity, or 9.2 amps for each of my batteries? Seems high?)

Float 2.24-2.26 vpc no time limit (Seems like a tight specification)

Equalize (!) 2.40-2.43 vpc until charge in current <0.10A per Hr/Max Time: 12Hr

Temperature coeff -3mV/cell/degree C

Minimum charge voltage limited to 35 C (95F), Maximum charge voltage at 15C(59F) -- I think this means to stop temperature compensating at the compensated voltage for these temps?

Jim

* This post was edited 01/25/13 12:26pm by HiTech *

enblethen

Moses Lake, WA

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Posted: 01/25/13 12:05pm Link  |  Print  |  Notify Moderator

Ask Boeing about charging sealed AGM style batteries!


Bud
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smkettner

Southern California

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Posted: 01/25/13 12:40pm Link  |  Print  |  Notify Moderator

HiTech wrote:

Bulk 30% of C (20 hour rate) at 1.75 vpc (volts per cell)

1.75 vpc seems low

I thought the research was pretty through on your selection...


2001 F150 SuperCrew
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Send a PM if I missed something

HiTech

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Posted: 01/25/13 01:02pm Link  |  Print  |  Notify Moderator

Great point. 10.5 v seems very low. And it is basically a c/3 charge rate. Almost sounds like a stage before bulk rather than bulk like fork trucks run. I wonder if it is a typo.

Jim

sh410

Northwest

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Posted: 01/25/13 01:14pm Link  |  Print  |  Notify Moderator

enblethen wrote:

Ask Boeing about charging sealed AGM style batteries!


I thought they were lithium batteries?





bobojay5

Eastern Kansas

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Posted: 01/25/13 01:15pm Link  |  Print  |  Notify Moderator

sh410 wrote:

enblethen wrote:

Ask Boeing about charging sealed AGM style batteries!


I thought they were lithium batteries?


They are...


Bob & Sharon
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MNtundraRet

Bloomington, MN

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Posted: 01/25/13 01:18pm Link  |  Print  |  Notify Moderator

After the saleforce and lawers get together specifications always look like "Catch 22".

I bought my Optima Blue Top (Marine Deep-cycle) 50AH Battery 10 years ago. The first 5 years I recharged it with a Sears (Automotive) Automatic 10/2/50 amp engine start Charger. Battery was recharged 10 or 2 amp rate during that period.

Then I puchased my Schumacher SC-12000A SpeedCharger (2 amp, 15-40 amp multi-stage, 120 amp Engine Start). I re-read the pamplet on the Optima and said "To heck with that!".

The last 4 years were using the SpeedCharger to recharge the 50AH Optima Battery from a starting point of 20%(11.6v) to 50%SOC(12.1v) in 75 to 180 minutes. I quess many would call that "Torture" but the battery lasted 9 years. Much longer than I ever expected. The charger spent about 1/2 the time at 40 amps and rest at 15 amps. Multi-stage charger will go back and forth on current rate, and voltage rate, to keep cell temperature below maximum acceptable.


Mark & Jan "Old age & treachery win over youth & enthusiasm"
2003 Fleetwood Jamboree 29


mena661

Southern California

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Posted: 01/25/13 01:19pm Link  |  Print  |  Notify Moderator

Call them and get some clarification on that then report back.


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Gale Hawkins

Murray, KY

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Posted: 01/25/13 01:40pm Link  |  Print  |  Notify Moderator

bobojay5 wrote:

sh410 wrote:

enblethen wrote:

Ask Boeing about charging sealed AGM style batteries!


I thought they were lithium batteries?


They are...


Is this the last Dreamliner fire issue?

enblethen

Moses Lake, WA

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Posted: 01/25/13 02:03pm Link  |  Print  |  Notify Moderator

Yes!
There is some thought that the glass mats separating the ion compound failed due to charging problems or overcharging.

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