Minimum battery size for starting

[luvrbus]

If works for you go for it Ed but we did a lot traveling in winter I'll stick with the 8D's you can never have to much batteries IMO if leave your flashers on for 5 hrs it will drain 2 group 31's lol they have no reserve compared to the 8 D's they die in a hurry.

Working on these thing trying to fire one sometime the 31's go in a hurry

[gus]

I drove my 4104 with 671 for five years with two 31s with no problem, don't know how that will work with a 92 though.

I now have two 4Ds on my 4107 with 8V71 which work fine, sort of halfway in between. I used them instead of 31s mostly because I was in a bind on a trip and didn't have time to sort out all the cable changes necessary for 31s.

[bobofthenorth]

My father told me a long time ago you can never have too good of tires or too much battery.  I'll stick with the 8Ds that it came with, no matter how much of a PITA they may be to handle. 

[Uglydog56]

If I plug in my cummins for about an hour, it'll start off one group 31.  I run 2 - 31's, 12v system.  My battery cables are about 2ft long 2/0, one for each battery.

[PSmith]

Two(2) G31's have worked for me since 1997, but I must say that 8D's would have done a better job of cranking speed at cooler temps.  In those conditions I preheat with the block heater or the Wabasto for about 45 mins.  Preheating is nice on the engine.

Just forgot to mention - 8v71N - probably easier than some to start

Just bought a new set(2)-   last ones where bought in 2003 -   I'm not mad 

[buswarrior]

Prevost has been sending them out the door with a set of 4 group 31's.

So, now there are 4 points of failure, instead of 2?

you pays your money, you takes your chances, no free lunch...

happy coaching!
buswarrior

[gus]

Bob, you may be right but I can't lift those monsters anymore! Since I live in a mild climate it is no problem. You guys in the frozen wasteland have a totally different problem!!

My battery guy told me all the new trucks are using 31s.

[bobofthenorth]

Its not rocket surgery Gus - it all comes down to pounds of lead.  If you have the same number of pounds of lead spread over more batteries we should both start the same.  Personally if its cold enough that I have to spin it more than once I stop cranking and find some heat.  And consider that I have failed miserably in my trip planning I might add.  The only real drawback to smaller batteries I can see is more connections but it only takes one bad connection to shut the whole show down, no matter how many batteries you have.