HiTech
Texas
Senior Member
Joined: 03/22/2002
View Profile
 Offline
|
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
Senior Member
Joined: 01/05/2005
View Profile
|
Ask Boeing about charging sealed AGM style batteries!
Bud
USAF Retired
Suzuki XL7 pushing Pace Arrow
|
smkettner
Southern California
Senior Member
Joined: 03/21/2005
View Profile
Good Sam RV Club Member
|
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
2006 Keystone Springdale 249FWBHLS
675 watts solar
Send a PM if I missed something
|
HiTech
Texas
Senior Member
Joined: 03/22/2002
View Profile
Offline
|
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
Senior Member
Joined: 08/29/2007
View Profile
|
enblethen wrote:Ask Boeing about charging sealed AGM style batteries!
I thought they were lithium batteries?
|
|
|
bobojay5
Eastern Kansas
Senior Member
Joined: 01/02/2007
View Profile
Good Sam RV Club Member
Offline
|
sh410 wrote:enblethen wrote:Ask Boeing about charging sealed AGM style batteries!
I thought they were lithium batteries?
They are...
Bob & Sharon
Eastern Kansas
2013 Winnebago ERA 70A
Sprinter Class B Van
Our Second Sprinter
|
MNtundraRet
Bloomington, MN
Senior Member
Joined: 12/06/2007
View Profile
Offline
|
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
Senior Member
Joined: 03/21/2009
View Profile
Offline
|
Call them and get some clarification on that then report back. 
2009 Newmar Canyon Star 3205, Ford F53 V10
Trojan L16 6V's 740 Amp-hours
|
Gale Hawkins
Murray, KY
Senior Member
Joined: 07/22/2007
View Profile
Offline
|
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
Senior Member
Joined: 01/05/2005
View Profile
|
Yes!
There is some thought that the glass mats separating the ion compound failed due to charging problems or overcharging.
|
|
|
