Good Sam Club Open Roads Forum: Tech Issues: Tow Vehicle Battery and Alternator
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CJM1973

Trenton, MI

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Posted: 11/11/19 05:40am Link  |  Quote  |  Print  |  Notify Moderator

One last question regarding my new AGM battery bank. What are the ideal charging parameters to set my AC to DC converter at? Bulk, absorption, and float. I think temperature has a play in the equation. Considering the money spent on these AGM batteries, I would like to have them around for awhile and avoid any overcharging scenario. We usually camp in fair weather temps (60-80*F). From my understanding, our trip to Alaska will have such a broad range of temps. I'm coming out of flooded GC2 batteries.

BFL13

Victoria, BC

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Posted: 11/11/19 08:40am Link  |  Quote  |  Print  |  Notify Moderator

Undercharging, not overcharging will be the issue. You need an ammeter to tell when amps are down to 0.5/100AH. That does not mean 1.5a for the bank of three, since the middle battery will not get its full share. I use my Trimetric as the ammeter. You need to do each battery separately to true full as often as possible.

On a trip it is too difficult to do all this right, so it is what it is. At home, you can do it right. See the AGM charging guide here, scroll down

https://www.trojanbattery.com/pdf/TrojanBattery_UsersGuide.pdf


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time2roll

Southern California

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Posted: 11/11/19 09:57am Link  |  Quote  |  Print  |  Notify Moderator

CJM1973 wrote:

One last question regarding my new AGM battery bank. What are the ideal charging parameters to set my AC to DC converter at? Bulk, absorption, and float.
The battery manufacturer will be the best resource on charging specifications.


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Rbertalotto

Massachusetts

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Posted: 02/26/20 06:51am Link  |  Quote  |  Print  |  Notify Moderator

I have two tow vehicles, RAM 2500 with 220a alternator and Toyota Venza with 150a alternator. I use a Renogy 40a DC to DC charger in both for charging batteries in a small off-road tent camper or a large toy hauler. Both vehicles have 2g wire from front battery to charger in rear.
The Renogy works way above my expectations. Amazing product.
I've been experimenting using my vehicle to idle and charge the battery. After 20 minutes charging I'm seeing very little heat rise on either alternator.using laser thermometer. And with a AGM group 31, 100ah, 60% battery, I'm back up to 90% after 20 minutes.
I no longer carry a bulky generator to off grid charge batteries when the sun isn't hitting my solar panels.
Do a Search on YouTube for Will Prowse. He is amazing and has done a great test on this Renogy unit.


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CJM1973

Trenton, MI

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Posted: 02/26/20 07:29am Link  |  Quote  |  Print  |  Notify Moderator

Rbertalotto wrote:

I have two tow vehicles, RAM 2500 with 220a alternator and Toyota Venza with 150a alternator. I use a Renogy 40a DC to DC charger in both for charging batteries in a small off-road tent camper or a large toy hauler. Both vehicles have 2g wire from front battery to charger in rear.
The Renogy works way above my expectations. Amazing product.
I've been experimenting using my vehicle to idle and charge the battery. After 20 minutes charging I'm seeing very little heat rise on either alternator.using laser thermometer. And with a AGM group 31, 100ah, 60% battery, I'm back up to 90% after 20 minutes.
I no longer carry a bulky generator to off grid charge batteries when the sun isn't hitting my solar panels.
Do a Search on YouTube for Will Prowse. He is amazing and has done a great test on this Renogy unit.


Thanks for the late input. Good to hear that it's been working great for you. I have yet to install the Renogy DC to DC charger in my tow vehicle as we are still in the middle of winter in Michigan. How did you wire the control terminal on the unit? Did you use your tow vehicle's ignition circuit? I have 4G wire (both pos & neg) to run from the TV's battery to the input on the Renogy unit. I'm wondering if I can just tap into the trailer's tail lights or do I need to run a dedicated 16-18G wire from the vehicle's ignition wire. House Batteries and Renogy are installed in a tongue box on the travel trailer. I would prefer only to have one 2-pin connector from TV to trailer. Just curious to how yours is wired.

Rbertalotto

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Posted: 02/26/20 07:45am Link  |  Quote  |  Print  |  Notify Moderator

Actually, I use one Renogy DC to DC charger between the two vehicles. Using ANDERSON high current connectors, I can swap the unit back and forth.

I installed an ON / OFF switch right on the charger so I can shut it off when not needed. I run the DC control wire from my licence plate light wiring. In this way, when the lights are on, the DC to DC charger is on. And I don't need to run another wire from the front of the vehicle.

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Battery Connection at tow vehicle

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Rbertalotto

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Posted: 02/26/20 07:48am Link  |  Quote  |  Print  |  Notify Moderator

BTW...These photos do not show a quick disconnect on the 12v+ lead that is feeding the on/off switch. In this configuration, no wire is needed from the licence plate wire.

CJM1973

Trenton, MI

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Posted: 02/26/20 08:34am Link  |  Quote  |  Print  |  Notify Moderator

Rbertalotto wrote:

BTW...These photos do not show a quick disconnect on the 12v+ lead that is feeding the on/off switch. In this configuration, no wire is needed from the licence plate wire.



Thanks for posting the pics. Very helpful. What is the LC terminal for? So you wired in a fused switch between the (+) input and control terminal?

Rbertalotto

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Posted: 02/26/20 09:16am Link  |  Quote  |  Print  |  Notify Moderator

LC Terminal = ????

We have no idea what this is for. Even Will Prowse couldn't understand the need. One of these days I'm going to call RENOGY to find out.

Will Prowse Video

There is a fuse with a plastic cover that I had in my junk box from back in the day when I installed high end car audio systems. I cut a hole in the plastic cover and mounted a simple SPST illuminated switch. This switch could be mounted anywhere.....

beck vega

Conyers,GA

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Posted: 02/27/20 03:52am Link  |  Quote  |  Print  |  Notify Moderator

You can try bamaboys towing.


towing service in Covington

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