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Old 11-20-2007, 10:18 AM   #1
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I changed the two 27-size batteries for two Interstate 8D. The 8D battery is about the size of three batteries. Got one to fit in to the Battery box with the Chassis battery. Then mounted the other 8D battery under the battery box in a tray I made. This make the battery count to about 6 batteries.

Upper Battery

Lower Battery tray
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Old 11-20-2007, 10:18 AM   #2
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I changed the two 27-size batteries for two Interstate 8D. The 8D battery is about the size of three batteries. Got one to fit in to the Battery box with the Chassis battery. Then mounted the other 8D battery under the battery box in a tray I made. This make the battery count to about 6 batteries.

Upper Battery

Lower Battery tray
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Old 11-27-2007, 08:02 PM   #3
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How did you muscle 158# batteries in yourself? Interstate Battery says their 8D is a 255AH battery. Just for the handling convenience, I would go with the U2500 6V batteries that have 250AH ea.
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Old 11-28-2007, 09:44 PM   #4
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Right off Interstate web Site:

Workaholic - 1400 CCA (8D-MHD)
SPECIFICATIONS
Weight: 131.70 pounds
Length: 20.75 inches
Width: 11 inches
Height: 9.63 inches
Cranking Amps: 1750
Cold Cranking Amps: 1400
Voltage: 12
Termination: A
Time at 25amp draw: 8hrs.
List Price: $209.95
Suggested Price: $181.95

I got the Battery for $150. Weight is 132lb.
The upper Battery I lifted one step at a time and lowered it in place. The lower Battery I mounted the tray first then used a loading ramp and slid it up and in to the tray from the side then locked it in to place.

U2500 6V
572 (9.5 hrs.) 25 Amp Reserve Capacity (rc)
59 Number of plates
76 Lbs
$171 Price

8D-MHD 12V
450 (7.5 hrs.) 25 Amp Reserve Capacity (rc)
180 Number of plates
132 Lbs.
$177 Price


Ruff math

25amps x 12v-dc = 300 watts
300watts / 120v-ac = 2.5amps-ac (inverter power)

(6v bat. x 2) 76 x 2 = 152 lbs.
6v bat. x 2 (in series) = 12v-dc
(6v bat. x 2) 572rc(9.5hrs.) x 2 = 572rc(9.5hrs.)
152 lbs. x 22 watts hrs./lbs. = 3344 / 300 watts used = 11.15 hrs. of use

(12v bat. x 2) 132 x 2 = 264 lbs.
12v bat. x 2 (in parallel) = 12v-dc
(12v bat. x 2) 450rc (7.5hrs.) x 2 = 800rc (15hrs.)
264 lbs. x 22 watts hrs./lbs. = 5808 / 300 watts used = 19.36 hrs. of use

The easiest way is to just compare weight as these batteries, 6v or 12v, all have about 22 - 25 watt hours per pound capacity.

Going from one battery to two of the same size will double the weight and increase capacity. If doubling up on 12v in parallel, you will get a bit more than double the capacity due to the Peukert effect.
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Old 12-02-2007, 06:03 PM   #5
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Oops! My bad. I thought you were using deep--cycle batteries. The stats you posted indicates a starting battery.
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Old 12-14-2007, 09:15 AM   #6
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Yes. They are cranking batteries. I have got 2 years on them, and they are working just fine. I will have to get back this after I see how long they last. I have a data recording system monitoring the usage. I will post the results when the Test is done. I am not going to replace them until I have to.
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Old 10-23-2008, 12:47 AM   #7
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I'm useing 6 8d's on my rig and they are national merine battries deep cycle.They have only amps listed at 1450 amp hrs.There is no crank amps listed.Don't know where you get 250 amp hrs at.I now use 2500watt inverter and going to a 5000watt inverter soon.I need lots of power for my two way radios.I have a 7kw gen.and a 250amp alt when I'm driveing.Looking into solor to charge if I can get large watt pannels to do the job without bringing the house roof with me.
RC
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