Alie&Jim's Carrilite Posted May 25, 2015 Report Share Posted May 25, 2015 I have a question about deciphering what a battery tag says. Our truck has 4 Deka 904D batteries as house batteries. These are charged by the truck alternator, but not used- isolated- from the truck batteries. On the label it says- 904D Cranking- 1280 CCA- 1050 What would the usable amperage be for these batteries? They checked out fine, I desulfated them and brought them up to a full charge- 14.4v The inverter on the truck is a Statpower Prosine 3000 inverter charger. Thoughts? Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
wa_desert_rat Posted May 25, 2015 Report Share Posted May 25, 2015 Google is your friend. http://www.wholesalebatteries.net/PDF/Deka%20Marine%20Master%20Specs%20%28June%202009%29.pdf About half way down the page look for the two specs you cited and then follow over to "reserve capacity" which indicates "290". So probably 290 amps for each battery (less any resistance in connectors, cables, etc.). WDR 1993 Foretravel U225 with Pacbrake and 5.9 Cummins with Banks 1999 Jeep Wrangler, 4" lift and 33" tires Raspberry Pi Coach Computer Ham Radio Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted May 25, 2015 Author Report Share Posted May 25, 2015 With 1/2 being actually usable, so 145amps per battery 4 batteries = 580amps or so. They will work until they die completely. And they add 400lbs behind the axle for a little extra weight. Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
Sehc Posted May 30, 2015 Report Share Posted May 30, 2015 for those sudo deep cycle, the 50% reserve capacity matches 20 hour amp rating. so these are equivalant 145 amp hour. Link to comment Share on other sites More sharing options...
Yarome Posted May 30, 2015 Report Share Posted May 30, 2015 Actually.. with a battery like that "reserve capacity" is not measured in amps. It is the reserve capacity in minutes at 80 degrees F to fall below 10.5v @ 25 amps. So you would calculate it at 290rc x .4167 -or- 4.8 hrs @ 25amps = 120ah capacity at the approximate 20 hr rate. 120ah x 4 = 480ah @ 50% = 240 "available" ah's. ....and... 400lbs. Link to comment Share on other sites More sharing options...
Yarome Posted May 30, 2015 Report Share Posted May 30, 2015 for those sudo deep cycle, the 50% reserve capacity matches 20 hour amp rating. so these are equivalant 145 amp hour. That's generally a pretty good rule of thumb for a single bank. Across multiple banks of cells it can get you into a little trouble though. In this case about 100ah discrepancy (or 50ah usable)... roughly 20%. Link to comment Share on other sites More sharing options...
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