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Old 03-02-2019, 04:47 PM   #1
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1972 23' Safari
Middletown , Rhode Island
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Where to locate 2 6 volt agm batterries

Hi does anyone have any idea/pics where I should place 2 agm 6 volt batteries in my 1972 safari 23 footer. Half of my electronics is located in my rear bathroom closet and the rest in my other nearest closet to the bathroom in back. Do you think I could put one battery in the closet and the other in the battery box behind /below it where my current 12v deep cell lead battery is located, just don't know if the 6 volt battery will fit. Maybe on its side, it is an agm??? Thanks. Any insight, ideas would be much appreciated. Would love to see what others are doing with their battery setup in their vintage safari's.
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Old 03-02-2019, 04:51 PM   #2
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Get a battery box for a modern Airstream, and weld it in place where it's mounted on the newer one.
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Old 03-02-2019, 07:40 PM   #3
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[QUOTE=overlander63;2215675]Get a battery box for a modern Airstream, and weld it in place where it's mounted on the newer one
I would but all my electronics are in the back. The run would be too long especially with my fuse box, inverter and converter is located in the rear.
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Old 03-02-2019, 08:31 PM   #4
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You can mount an AGM in any orientation. The strap would need to be as short as possible with B+ connected at one battery and B- at the other. Once you know the DC load, plug into this calculator. I would probably do an overkill with the strap #4/0... I would think 1% voltage drop would be my goal.
I like this one:
https://www.calculator.net/voltage-drop-calculator.html
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Old 03-03-2019, 05:16 AM   #5
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Quote:
Originally Posted by Wolfwhistle View Post
You can mount an AGM in any orientation. The strap would need to be as short as possible with B+ connected at one battery and B- at the other. Once you know the DC load, plug into this calculator. I would probably do an overkill with the strap #4/0... I would think 1% voltage drop would be my goal.
I like this one:
https://www.calculator.net/voltage-drop-calculator.html
So are you saying I should be ok to mount my batteries up front and if I use a 2awg wire from batteries back to my electronics/inverter/converter 20 ft away I should be ok. The calculator results are...
voltage drop: 0.19
Voltage drop percentage: 0.16%
Voltage at the end: 119.81
Using 2awg copper wire.
Thanks.
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Old 03-03-2019, 08:39 AM   #6
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What did you use for voltage? battery are 12 volts dc. How many amperes did you use in the calculator? 2AWG is not large enough.
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Old 03-03-2019, 09:06 AM   #7
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120 for voltage
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Old 03-03-2019, 11:31 AM   #8
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To calculate battery dc wiring, you need the length of the wire from the battery, the expected maximum draw in amperes, and the voltage for the calculator is 12 volts. Example; 50 amps maximum expected amps, 20 feet one way wire run, at 12 volts with a 1% voltage drop. I would use 2/0 awg, not 2awg. 2/0 is safe, will not melt, for over 280 amps, so I would have a 200 amp fuse at the battery positive. The appropriate fuses will be at the other end for those circuits.
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Old 03-03-2019, 11:38 AM   #9
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Quote:
Originally Posted by Zil View Post
To calculate battery dc wiring, you need the length of the wire from the battery, the expected maximum draw in amperes, and the voltage for the calculator is 12 volts. Example; 50 amps maximum expected amps, 20 feet one way wire run, at 12 volts with a 1% voltage drop. I would use 2/0 awg, not 2awg. 2/0 is safe, will not melt, for over 280 amps, so I would have a 200 amp fuse at the battery positive. The appropriate fuses will be at the other end for those circuits.
Thatís what I meant 2/0 awg.
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Old 03-03-2019, 08:24 PM   #10
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Quote:
Originally Posted by Mx468 View Post
Thatís what I meant 2/0 awg.
To get .16% voltage drop for 20 feet at 12 volt on #2/0 the amp load is 7 amps. So, this can't be correct. To end up with less than 1% voltage drop at 12 vdc the load could only be 40 amps. A 1000W inverter would draw about 85 amps DC. Can you attach a simple drawing of where everything is and the wiring length between them?
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