Re: Joe's '49 Club Sedan

Posted by 39SixSedanMan On 2017/8/3 11:56:25
"...rather than replace the original long 6 volt battery, it was replaced with 2 Optima 6 volt batteries wired together for 6 volts."

Hey, just a word of warning from an electrical engineer who has worked with automotive battery architectures and experienced the failure modes of batteries connected in parallel. Of course it is true you'll have much higher cranking current available; true also that there are examples in trucking, commercial construction and agriculture equipment that used batteries in parallel.

However, ultimately when one of the batteries fail before the other, the failed battery will have a lower terminal voltage and become a low resistance short to the other battery. The result is a very high current from one to the other and a potential fire/chemical hazard. Just want you to know that.

Finally, a battery that can delivery a whopping current can also receive it during charging, so it's worth making sure your voltage/current regulators are working at preferred voltage in order to protect the generator from over current and armature melting. For what it's worth, NAPA offers a screw terminal mounted fuse in several different ampere ratings that can be used to protect the generator.

I hope this helps,
Pat

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