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  #1  
Old 04-13-2007
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2 6s to make a 12

What size wire should I use to connect two 6-volt batteries together to use them (I always forget which is series and which is parallel) in the configuration that gets me a 12-volt power source?
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Old 04-13-2007
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Connect the two 6V batteries in series. Use #3 jumpers minimum
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Old 04-13-2007
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Hesper-

It depends on how far apart the batteries are. The closer together they are, the smaller the wire can be. I wouldn't go any smaller than 2 AWG for short runs... larger for longer runs.
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Old 04-13-2007
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I've found in the process of the battery tests we've been doing over the past year that the jumper size can make a very big difference, much more than is intuitive. This is particularly true when it comes to charging the batteries, since jumper size affects the internal resistance of the battery as seen by the charger.

Accordingly, I'd say use a jumper much larger than you'd imagine necessary; I've replaced all mine with 1/O and 2/O very short jumpers. If you align the golf-cart batteries (I assume that's what you're talking about) correctly, you can make these jumpers less than a foot long overall.

Bill
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I just did this/asked this question a few weeks ago. I later talked to a friend who is in the marine electric bussiness. The word on the street is the same as said above, 2 AWG or larger. However, we went with 2/0 AWG because he had some scraps. A lot of marine electric companies will give you a deal if you need a few 8 inch pieces of boat cable. The lugs however are expensive and require a special crimper. The advantage to using smaller cable is that it is flexible and may allow you to route the cable in such a way that you can access the battery better for servicing. We were lucky and ours all worked out with more or less straight runs.
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