wADVr
Adventurer
I apologize and willing to take my beatings in advance.. but been reading many topics on dual batteries and many others looking for the same info I am trying to confirm but I am trying to get my basic understanding confirmed before diving into the details of proper charging systems...
Background info:
I now have a battery tray that will fit either 2 group 34(stock JK battery), 2 group 24s(same LxW dimensions as the 34 just 1 inch taller) or a single group 31. I currently have a single DieHard AGM group 34 though discontinued at this point. I am trying to keep this simple so I am starting with the amp hour capacities and making sure I have that theory correct. My ’idea’ at this point is to set up a separate accessory circuit that would have a voltage sensing switch to cut off at 12.0-12.1 volts which seems to be right at the 50% safe discharge level so the accessories would not run the battery down past that safe level. My idea was to use this switch and separate circuit for either a single or dual battery set up but am unclear on possible damage at this level when trying to start the vehicle to recharge the battery(in the single battery set up). Dual battery set up would be isolated as normally done so the starter battery is unaffected and always charged and ready to start the vehicle. Or is it ok(not a bad idea) to pull down both batteries to 50%(12volts) with expectation of them both starting the vehicle?
Other acknowledged pending info is my alternators charge voltage and amp capacity. I will be running an alternator designed for a 2010 Grand Cherokee and a ECU programmed to run a 2015 Ram 5.7 Hemi all in a 2009 JKU so some unknowns at this point until I get the project completed which I believe is needed to determine the next level of this project. Not to mention I am not sure if the ECU or the TIPM regulates the voltage, nor do I recall my previous charge voltage in the all stock ‘09 JKU.
can someone please confirm my basic math below that essentially is comparing a single Group 31 to dual Group 24 and 34s. single battery acting as starter and house/accessory battery and the dual setup as isolating the house/accessory battery or as an option both combined for comparison and seeking advise on that method as well.
Group 31 100aH rating which should only be used to 50% so 50aH capacity.
Group 34 55aH rating which same as above results in 27.5aH capacity Or both batteries being 55aH.
Group 24 75aH rating which again same method leaves 37.5aH capacity Or both batteries being 75aH.
thanks in advance for any info or confirmation, I am really trying to keep this simple and would really like the single group 31 to work as I have laid out above to keep it simple but the knowledge in this forum is MUCH greater than mine!
Background info:
I now have a battery tray that will fit either 2 group 34(stock JK battery), 2 group 24s(same LxW dimensions as the 34 just 1 inch taller) or a single group 31. I currently have a single DieHard AGM group 34 though discontinued at this point. I am trying to keep this simple so I am starting with the amp hour capacities and making sure I have that theory correct. My ’idea’ at this point is to set up a separate accessory circuit that would have a voltage sensing switch to cut off at 12.0-12.1 volts which seems to be right at the 50% safe discharge level so the accessories would not run the battery down past that safe level. My idea was to use this switch and separate circuit for either a single or dual battery set up but am unclear on possible damage at this level when trying to start the vehicle to recharge the battery(in the single battery set up). Dual battery set up would be isolated as normally done so the starter battery is unaffected and always charged and ready to start the vehicle. Or is it ok(not a bad idea) to pull down both batteries to 50%(12volts) with expectation of them both starting the vehicle?
Other acknowledged pending info is my alternators charge voltage and amp capacity. I will be running an alternator designed for a 2010 Grand Cherokee and a ECU programmed to run a 2015 Ram 5.7 Hemi all in a 2009 JKU so some unknowns at this point until I get the project completed which I believe is needed to determine the next level of this project. Not to mention I am not sure if the ECU or the TIPM regulates the voltage, nor do I recall my previous charge voltage in the all stock ‘09 JKU.
can someone please confirm my basic math below that essentially is comparing a single Group 31 to dual Group 24 and 34s. single battery acting as starter and house/accessory battery and the dual setup as isolating the house/accessory battery or as an option both combined for comparison and seeking advise on that method as well.
Group 31 100aH rating which should only be used to 50% so 50aH capacity.
Group 34 55aH rating which same as above results in 27.5aH capacity Or both batteries being 55aH.
Group 24 75aH rating which again same method leaves 37.5aH capacity Or both batteries being 75aH.
thanks in advance for any info or confirmation, I am really trying to keep this simple and would really like the single group 31 to work as I have laid out above to keep it simple but the knowledge in this forum is MUCH greater than mine!
