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Old 02-05-2021, 12:01 PM #16
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I don't know what kind of trailer you have, but IMO a better approach may be to mount solar panels on your trailer if possible and wire them to the battery. That way it will charge when towing and continue to charge while parked at camp. It will also keep the battery topped off if you park your trailer outside between trips.
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Old 02-09-2021, 02:47 PM #17
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i used a 6 gauge wire for my setup from the battery to the back of my 4runner. here's my portable dual battery setup. i use dc-dc redarc charger, 25Amps. to the op, in your case you need to use a 4 gauge wire. see my video, not too much but enough to get some idea. https://www.youtube.com/watch?v=ZbVtZvK-f9s
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Old 02-09-2021, 02:53 PM #18
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in your case, you need to wire another positive (you need to fuse it too) from the car battery under the truck and make sure to use a wire loom and secure it to the body and at the end of the wire, install an anderson connector.

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Originally Posted by Johncmng View Post
Hi all,
How do I run high current wires from my alternator to a a trailer that I am towing? This will be for my LIFEPO4 battery in the battery box of the trailer. Maximum current will be around 180Amps. Do I run the wires under the truck? If so, what kind of wire insulation is best to cope with the environment?
TIA
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Old 02-09-2021, 07:30 PM #19
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why are you recommending a wire gauge without knowing anything about the charging capacity of whatever charge controller he is using?
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Old 02-09-2021, 07:53 PM #20
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so you want to trickle charge your battery on the trailer? youre way over thinking this.....
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Old 02-10-2021, 04:03 AM #21
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180amps?! WTH are you trying to do, charge a Tesla while you haul it cross country?!
I also very much hope that you already have the DC Power & Engineering 270amp alternator installed. Otherwise drawing that much power, even on surge, is going to kill your truck battery and/or the OEM alternator eventually. Even with the 270A you're going to need "the big three upgrade" AND a dedicated run to the trailer to handle that level of amperage. Obviously the 7-pin trailer connector isn't good enough as it's only fused at 30A.
@Discovery ran an 8AWG line with Anderson connectors to his trailer seen in this thread.

How big of a cable you need for the 180A at 14v is really a question of length. I always try to use a voltage drop calculator like this one. Just ensure you've got it set to DC 14v at the start, and to account for any vertical distance as well as horizontal. You can change the cable size and watch the voltage drop increase or decrease. Remember that LiPO usually require 13.5+v in order to charge properly, so you're not going to have much tolerance for that voltage drop. Having the LiPO near the tongue of the trailer will simplify your voltage problem by reducing the overall distance.
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Old 02-10-2021, 03:19 PM #22
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Thanks all for your comments. I'm building a LIFEPO4 battery pack with a 180A BMS. And yes, I have upgrade my alternator to handle the current output. My thinking is that after a few days camping in one spot, I only need to drive about 2 to 3 hours to fully top off the batteries. Specifically I was asking how I should route the wires to the hitch. Do other people zip tie the cables to the frame? What other method is best to secure the cable? Where along the frame is best to mount the wire?

TIA
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Old 02-10-2021, 07:47 PM #23
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Quote:
Originally Posted by Johncmng View Post
Thanks all for your comments. I'm building a LIFEPO4 battery pack with a 180A BMS. And yes, I have upgrade my alternator to handle the current output. My thinking is that after a few days camping in one spot, I only need to drive about 2 to 3 hours to fully top off the batteries. Specifically I was asking how I should route the wires to the hitch. Do other people zip tie the cables to the frame? What other method is best to secure the cable? Where along the frame is best to mount the wire?

TIA
having a 180A BMS does not mean that you can just connect it to your vehicle in a dual battery setup and charge at 180 Amps, you still need a DC-DC charger that is rated for Lithium and the amperage capacity of the wiring will need to match the charging capacity of your DC-DC charger
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Old 02-11-2021, 09:40 AM #24
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Quote:
Originally Posted by jhguth View Post
having a 180A BMS does not mean that you can just connect it to your vehicle in a dual battery setup and charge at 180 Amps, you still need a DC-DC charger that is rated for Lithium and the amperage capacity of the wiring will need to match the charging capacity of your DC-DC charger
Lol

You hit the nail on the head lifep04 batteries have a circuit (built into the battery) to control charge and discharge rates

You could put a million amps and 2 million volts at it and the on board circuit controls the Amps and voltage rate... So most of these batteries have like a peak 20 amp charge at 60% DOD . What are you going to do with the extra 160 lol
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Old 02-11-2021, 11:23 AM #25
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Lol

You hit the nail on the head lifep04 batteries have a circuit (built into the battery) to control charge and discharge rates

You could put a million amps and 2 million volts at it and the on board circuit controls the Amps and voltage rate... So most of these batteries have like a peak 20 amp charge at 60% DOD . What are you going to do with the extra 160 lol
In case ha wants a spectacular meltdown. Need amps for that. 20A is meh.
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Old 02-11-2021, 12:43 PM #26
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he specifically mentioned 180Ah and wanted to put it on a trailer. i would say he will need around 25-30 foot wire from the front to the trailer. a 6 gauge wire is what is needed and a 25A dc-dc charger and a 6 gauge wire.

in my case, i have another agm battery with at least 70Ah and i use a redarc 25A dc-dc charger to charge it and used only 15 feet of wire and it works really great during my road trip. the op i think still don't understand it yet but he will once he starts his project.


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why are you recommending a wire gauge without knowing anything about the charging capacity of whatever charge controller he is using?
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Old 02-11-2021, 01:14 PM #27
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Quote:
Originally Posted by 4r-4ever View Post
he specifically mentioned 180Ah and wanted to put it on a trailer. i would say he will need around 25-30 foot wire from the front to the trailer. a 6 gauge wire is what is needed and a 25A dc-dc charger and a 6 gauge wire.
he actually said 180 Amps, that's why everyone is confused


(and didn't say he has a 25A dc-dc charger)
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Old 02-11-2021, 02:32 PM #28
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Quote:
Originally Posted by Tbasse01 View Post
Lol

You hit the nail on the head lifep04 batteries have a circuit (built into the battery) to control charge and discharge rates

You could put a million amps and 2 million volts at it and the on board circuit controls the Amps and voltage rate... So most of these batteries have like a peak 20 amp charge at 60% DOD . What are you going to do with the extra 160 lol
I have a Daly BMS charger that is capable of charging LIFEPO4 at 180Amp at the correct voltages. The battery is capable of handling 280Amps of charging.
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Old 02-11-2021, 08:42 PM #29
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probably the discharge rating, but more importantly you still need something protecting your starting battery
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Old 02-12-2021, 03:01 PM #30
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Quote:
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probably the discharge rating, but more importantly you still need something protecting your starting battery
My discharge rating is at 208Amps! Yes, I will be protecting the starter battery.
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