Re: Grounding Batteries in Parrallel

Posted by Texasmark1 on January 17, 2012 at 15:28:29 from (67.142.164.22):

In Reply to: Grounding Batteries in Parrallel posted by WarrenBult on January 17, 2012 at 12:56:45:

Let's study basics. Big tractor engines suck up a lot of amps to get started. My little 90 hp 2 cycle outboard motor is spec'd at 120 amps to start and the 115 version is up to 150. These engines are around 80-100 cu in with cranking compression around 150 psig.

Obviously a 400 cu in Diesel, with compression in the 500 range will easily master 200 amperes. Simple math tells you that 200 amps from a 12v battery, when you want at least 11v at the starter, doesn't leave you much, if any room for resistance in the interconnection.

The thing sucking the amps is the starter and it gets it's amps from the batteries......soooo you have to marry the batteries to the starter, not to other things with long small wire runs.

How done? Use 00 (2ought) wiring; wire the batteries in parallel with hots to hots (12v to 12v) and colds to colds (- to -).

The battery nearest the starter gets wired to the starter( 2 very short wires) with the same wire size. Battery + to starter solenoid, - to starter housing mounting bolt at the housing with all connections bright, shiny, and tight....scrape the paint off the interconnect area to get metal on metal.

Now you are talking and if you do this, which I have done on a 4230 with a factory designed/installed 6v on the right side grounded at the engine block on that side, running one wire over to the 6v on the left side with the + terminal of that connected to the solenoid.....all with 0 AWG wire,resistance of both batteries in series, rather than in parallel as it is in my arrangement (1/4 the circuit resistance)..........totally SUCKS!!!!!

With a fresh pair of 12v batteries (I use the 31 which is a 27 with 3/8" stud terminals....that OTR truckers use....much lower resistance than the regular lead compression terminals) and the wiring hookup I mentioned, if you don't think that 6 cylinder hummer won't leap to life on the coldest days with no assist, try it.....will make a believer out of you. BTDT and never had to use ether start again.

If you are serious you will do as I said for about $200 total cost. Neat thing about buying the OTR truck batteries, being heavy duty and all, the truck dealer bought the batteries by the skid and had his own cable making capability. So batteries were $57 each and cables/lugs made up the rest and that included a double wire run of 00 from the right side to the left side of my 4230 with cab.

Try it and come back and tell us how happy you are with your decision to DO IT RIGHT.....PFFFFFT ON MOTHER DEERE AND HER ELECTRICAL DESIGNERS!!!!!!

HTH,

Mark

Replies:

• Re: Grounding Batteries in Parrallel LJD 15:58:47 01/17/12 (2)
  • Re: Grounding Batteries in Parrallel Texasmark1 06:33:31 01/18/12 (1)
    • Normal cranking voltage LJD 14:54:45 01/18/12 (0)

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