but what is the advantages/disadvantage of (2) 6 volts in serial or (2)12 volts in parrallel.
With two 6 volt batteries in series, the voltage adds but NOT the current or CCA. If the batteries were equal rated and are rated to supply say 500 amps and you put two in series, the total can still supply (in general theory, but still subject to other factors) no more then 500 amps. If one of the two batteries can supply less then the other one, the sum of the two together in series is still no higher then the weakest battery.
If you use two 12 volt batteries in paralell, voltage stays the same BUT the current and CCA is additive. If one is rated to supply 500 amps and the other can supply 500 amps, in paralell they could supply 1000 amps (as always, subject to other minor factors)
REGARDLESS I would use identical batteries, same age, brand, type, size etc etc.
OTHER CONSIDERATIONS; To start a diesel you need good fast cranking to keep the compression up and to heat the air sufficient for combustion when the fuel is injected THEREFORE ID PREFER TWO TWELVES IN PARALELL for good high current capacity to really spin the starter at decent RPM.
SU8JECT TO: My discussion above assumes the two chosen 12's in paralell can supply more current then two 6's in series HOWEVER THAT DONT HAVE TO BE TRUE if you had two light duty wimpy 12's thay may not yield more the two heavy duty 6's
OF COURSE only a sigle 12 volt can work, it depends on the temperature and condition of engine and other factors and that would mean less connections that are prone to problems. If youre in a warm climate and the tractor starts easy you could get by with a single heavy duty 12!!!!!!!!!!!!!!!!
Like Fox News, we report now you decide, its your money, your budget, and your tractor that has to start SO ITS YOUR CALL
If I missed something maybe the other fine gents here can add to this. The above represents my opinion, others may have similar or different opinions.
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