2 Batteries Needed Post-Roscommon 12V Conversion?

[spectre6000]

I can make a case for and against in my head. Has anyone run a single battery after converting to 12V? I'm contemplating an isolated in-house battery setup, and it'd be nice to be able to use the second battery for that purpose versus having to get and locate a third. Thanks.

 

[MarcusOReallyus]

Here's one idea: You can fit two group 31s onto a single battery tray, then put another one on the remaining battery tray. The link is to a thread that has some good info.

 

[dependable]

Putting two on one tray is a good approach. But you should use two for starter. All the civilian 12v 6.2s came with and needed two batteries.

 

[Warthog]

With the high compression of the 6.2L, your starter will appreciate the extra battery.

 

[spectre6000]

That's what I was trying to suss out. I knew the civilian models were 12V all the way, but wasn't sure what the battery situation was. Thanks. I imagine a single battery would technically work so long as the battery were sufficiently powerful, but two is pretty much minimum.

 

[TechnoWeenie]

It's not just the starter.

Your glow plugs will pull a hundred amps easy.....

 

[Skinny]

One battery would do it if it was an 8D. A sufficiently sized single battery would weigh over 100 pounds and not be easy to fit in the engine compartment. Don't reinvent the wheel, a pair of decent group 31's will set you back two bills and work great.

 

[Keith_J]

Power to turn over the engine remains the same, with two in series, current is halved for the starter. The glow plug draw is the same, half of that power is dissipated on the resistor bank in the 24 volt system.



Yes, use 2 batteries which is a tad bit more efficient since the 1200 watts dissipated in the resistor bank goes away. But you have double the draw on the starter.

 

[MarcusOReallyus]

It's not just the starter.

Your glow plugs will pull a hundred amps easy.....

Yep. Antennaclimber recently measured it at 100 amps.

 

[rlltide12]

I put two group 31s in a custom made rear tray. See my build thread. Works great

Edit: Build thread is in my sig.