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Faunsdale, AL | Neither batteries or starters were as compact and powerful as available today. So double the voltage and you can build everything for 1/2 as many amps and still get the same power.
When electric start was becoming available, 24 volt systems were used on larger engines and diesels. 6 volts was very common for smaller engines. 6 volts soon became 8 and then 12 as engine sizes generally increased.
Series connections of batteries of course adds voltage and I think there is some theoretical benefit for even charging two batteries in series vs two in parallel. If you think of it, what we call a battery is several cells hooked together in series. So when we hook two batteries together in series, it behaves like a longer battery unless there’s a bad connection on one of the battery terminals. of course the same is true if you hook them in parallel. Parallel gets you bigger plates/bigger battery, so 6 of one/half dozen of another!
Practically the only thing I can tell between series vs parallel is that one weak battery or poor connection in a series setup and starter isn’t going to work! You may never even notice it on a parallel setup. Which is good and bad.
It does take less cable to connect two batteries in series.
Edited by ccjersey 9/12/2024 06:49
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John Deere 4020 electrical
