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Old 02-23-2019, 03:48 PM   #1
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1979 31' Excella 500
Wanette , Oklahoma
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Battery Question

I have a 1979 airstream my question is can I put 2 12 volt batteries in the 2 batteries cOmpaents. 6 volt golf cart batteries are too big for The compartments i have been hooking up only one at a time and disconnecting it to hook up the the other one when one got low
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Old 02-24-2019, 10:43 AM   #2
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Originally Posted by SteveNancyF View Post
I have a 1979 airstream my question is can I put 2 12 volt batteries in the 2 batteries cOmpaents. 6 volt golf cart batteries are too big for The compartments i have been hooking up only one at a time and disconnecting it to hook up the the other one when one got low
It depends on the size of the battery box but you can hook up 2 12volt batteries in parallel. There are different group sizes; 24, 27, 31, etc. Measure your battery box then you can shop for batteries in the group size that will fit.

If the 6 volt are too big and you're only putting one in there at a time, how are you running lights etc. on just 6 volts??? Maybe I'm misunderstanding and you've got 2 12 volt but they are too big to fit into the box. Check the battery labels, see if it tells you what group they are. Also, they should be deep cycle, not ignition/starting batteries.
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Old 02-25-2019, 08:49 AM   #3
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1979 31' Excella 500
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Sorry I was unclear have 2 12volt batteries that fit. I just didn't know if I could hook both at same time. Wondered if it would overload the system so I just hook one up at a time. They are marine deep cycle not the best type of deep cycle i know but I'm rural Oklahoma what the heck. Thank you for your reply as you answered that I could hook them both up at once. Enjoy your day.
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Old 02-25-2019, 08:57 AM   #4
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Factory battery compartments? Factory battery wiring?

Both battery positives tie together and both negatives tie together.
This keeps you at 12 volts but twice the capacity as one by it self.

Clear as mud?
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Old 02-25-2019, 09:00 AM   #5
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Quote:
Originally Posted by SteveNancyF View Post
I have a 1979 airstream my question is can I put 2 12 volt batteries in the 2 batteries cOmpaents. 6 volt golf cart batteries are too big for The compartments i have been hooking up only one at a time and disconnecting it to hook up the the other one when one got low
Are your battery boxes the type that are in the body of the trailer (one on each side) rather than the battery box in the tongue a-frame?
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Old 02-25-2019, 11:27 AM   #6
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Originally Posted by SteveNancyF View Post
Sorry I was unclear have 2 12volt batteries that fit. I just didn't know if I could hook both at same time. Wondered if it would overload the system so I just hook one up at a time. They are marine deep cycle not the best type of deep cycle i know but I'm rural Oklahoma what the heck. Thank you for your reply as you answered that I could hook them both up at once. Enjoy your day.
12 volt batteries in parallel (positives together, negatives together) will be 12 volt. So you can put both batteries in the battery box, connect the positives together and the negatives together. NOTE: If one battery is weaker it will drag down the other battery's power. Batteries work best when are the same brand, size and age.

Vented lead-acid batteries must be kept outside because they vent hydrogen gas. AGM sealed batteries can be used inside, they do not vent.
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Old 02-26-2019, 09:37 AM   #7
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1979 31' Excella 500
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thank you for the reply i have the 2 batterie compartment type. this system allows one to automatically hook up properly the negative and positive. i unhook both batteries when trailer is not in use as the inverter will continue to charge the batteries and boil off the electrolyte. oklahoma summers do not help a lot. i just check stuff regularly to avoid problems. anyway thank everyone for thier concerned help. got to go split some wood for next years heat
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Old 02-26-2019, 02:42 PM   #8
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I'm still splitting wood for this year's heat.

Here is a link with instructions for connecting battery. http://www.smartgauge.co.uk/batt_con.html
""Finally, if you only have 2 batteries, then simply linking them together and taking the main feeds from diagonally opposite corners cannot be improved upon.
Once the number of batteries gets to 3 or more then these other methods have to be looked at.""
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Old 02-26-2019, 07:20 PM   #9
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12 volt batteries in parallel (positives together, negatives together) will be 12 volt. So you can put both batteries in the battery box, connect the positives together and the negatives together. NOTE: If one battery is weaker it will drag down the other battery's power. Batteries work best when are the same brand, size and age.

Vented lead-acid batteries must be kept outside because they vent hydrogen gas. AGM sealed batteries can be used inside, they do not vent.
Just a clarification to the wiring diagram you posted. I know you're focused on the parallel wiring part, but they should actually be wired in the following manner to ensure balanced draw and charging. It's a subtle but critical difference to ensure longevity of the batts.

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Old 02-27-2019, 09:34 AM   #10
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1979 31' Excella 500
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I deeply appreciate all the advice, especially the wiring diagrams. I know what to do now. Happy travels to all.
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