3rd gen dual battery

Has anyone try to put a group 31 in the spare location using off grids auxiliary tray?

 

I wire up switches like this for boats all the time. They work well


One of these will split charging to both batteries

 

Would there be any issue running your batteries in parallel? That would give you massive amperage. What's the need of the relay? Correct me if I wrong but, the mount and the cables for parrallel mount should be all that's needed right?

 

All dual battery systems run the batteries parallel. If they was in series you’d have a 24v system. The purpose of the smart isolator or rely is to have capability to separate the 2 batteries. That is the advantage of the relay, keep your starting battery from going dead, and just use the aux battery to run any extras you have (fridge, lights etc..)

so that being said you don’t need the relay, you would just have one big ass battery with a lot of Ah. But no safety net.

 

Thank you, Shortly after my post on this in march i ended up purchasing the Offgrid Dual split system. It arrives this week, should be installing it this weekend.

 

Total noob here... but on my passenger side behind the air unit I have an anti lock brake module. Does everyone have this located here, or just me?? If so, do you mount the battery above it?

 

You can't run it there on a sport. You can do a side by side dual battery or a second battery in the cab or bed.

 

Thanks! I was so confused haha!

 

This is the worst part about a sport. I have one as well and it bummed me out. I think it looks cleaner to have the battery on the other side

 

This is my DIY Dual Battery setup... cost about $900 with everything including the 115AH AGM battery and even the sound deadening mat.

 

Nice set up. When i do my dual battery set up i want them separated. Because i didn't want 2 group 34s, with only 68AHs. i was going to use a group 27f or group 31, along with a normal size starting battery.

 

Agreed, that was my thought process as well. I actually have a group 31 Northstar for my starting battery... between the 2, I feel pretty good about my available power.

 

Haha yeah you should be good. Dont even need solar, haha

 

So far, I don't haha. I went on an 8 night camping trip (moving between sites everyday) and had no issues running my dometic 55 fridge and camp lights, ect.... Average battery voltage was 12.6-12.7 every morning.

 

You mind putting up a parts list of what you got?

 

Parts List:
DCC50S DC-DC MPPT On-Board Battery Charger | Renogy Solar
BT-2 Bluetooth Module | Renogy Solar
victron 115ah agm - Google Shopping --(I got my Battery from a Victron dealer, but this is one option)

$22 TOPSTRONGGEAR 4 Gauge Black 25ft Power/Ground Wire-Copper Clad Aluminum CCA-True 4 AWG Power Wire-True Spec and Soft Touch Cable (Black)

Amazon.com: TOPSTRONGGEAR 4 Gauge Black 25ft Power/Ground Wire True 4 AWG Power Wire-True Spec and Soft Touch Cable (Black) : Electronics

$25 4 Gauge Red 25ft Power/Ground Wire-Copper Clad Aluminum CCA-True 4 AWG Power Wire-True Spec and Soft Touch Cable (Red)

Amazon.com: 4 Gauge Red 25ft Power/Ground Wire True 4 AWG Power Wire-True Spec and Soft Touch Cable (Red) : Electronics

$10 10pcs 4 Awg - 5/16" (M8) Sanuke Wire Lugs Ring Terminal Connectors Ends, UL Listed Heavy Duty for Battery Cable Lug Wire Electrical Eyelets with 3:1 Dual Wall Adhesive Heat Shrink

4 AWG - 5/16" Battery Terminal Connectors, Sanuke Copper Wire Lugs Assortment Battery Cable Ends with 3:1 Heat Shrink Tubing: Amazon.com: Industrial & Scientific

$10 10pcs 4 Awg - 3/8" (M10) Sanuke Wire Lugs Ring Terminal Connectors Ends, UL Listed Heavy Duty for Battery Cable Lug Wire Electrical Eyelets with 3:1 Dual Wall Adhesive Heat Shrink

4 AWG - 3/8" Battery Terminal Connectors, Sanuke Copper Wire Lugs Assortment Battery Cable Ends with 3:1 Heat Shrink Tubing: Amazon.com: Industrial & Scientific

$9 25ft - 1/2" PET Expandable Braided Sleeving – Black – Alex Tech Braided Cable Sleeve

Amazon.com: 25ft - 1/2 inch PET Expandable Braided Sleeving – Black – Alex Tech braided cable sleeve : Electronics

$10 25ft - 1/2" PET Expandable Braided Sleeving – BlackRed – Alex Tech Braided Cable Sleeve

Amazon.com: 25ft - 1/2 inch PET Expandable Braided Sleeving – BlackRed – Alex Tech Braided Cable Sleeve : Electronics

$9 Hilitchi 30 Piece Nylon Plastic Waterproof Adjustable 3.5-13mm Cable Glands Joints Cable Gland - PG7, PG9, PG11, PG13.5, PG16

Hilitchi 30 Piece Nylon Plastic Waterproof Adjustable 3.5-13mm Cable Glands Joints Cable Gland - PG7, PG9, PG11, PG13.5, PG16 - - Amazon.com

$11 ZBSJAKU 0/2/4/8 Gauge AWG ANL Fuse Holders(2 Pack)+100 Amp ANL Fuses (2 Pack) for Car Audio/Alarm/Amplifier(2 Pack)

Amazon.com: ZBSJAKU 0/2/4/8 Gauge AWG ANL Fuse Holders(2 Pack)+100 Amp ANL Fuses (2 Pack) for Car Audio/Alarm/Amplifier(2 Pack) : Electronics

$6 ANL Fuse 60A 60 Amp For Car Vehicle Marine Audio Video System Gold 2 Pack (60 Amp)

Amazon.com: ANL Fuse 60A 60 Amp For Car Vehicle Marine Audio Video System Gold 2 Pack (60 Amp) : Automotive

$75 KILMAT 80 mil 36 sqft Car Sound Deadening Mat, Butyl Automotive Sound Deadener, Audio Noise Insulation and dampening

Amazon.com: KILMAT 80 mil 36 sqft Car Sound Deadening Mat, Butyl Automotive Sound Deadener, Audio Noise Insulation and dampening : Automotive

 

Also these, if you don't have them:

$34 iCrimp Battery Cable Lug Crimping Tool for 8, 6, 4, 2, 1, 1/0 AWG Heavy Duty Wire Lugs, Battery Terminal, Copper Lugs with Wire Shear Cutter

IWISS Battery Cable Lug Crimping Tool from AWG 8-1/0 with Cable Cutter - - Amazon.com

 

Thanks man!

 

@MR E30

 

Perfect, I just started diving into this on Friday, and this list is very helpful. Thank you Ryan!