DC-DC Charging questions.
1st Gear
Joined: Feb 2023
Posts: 1
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I have 2016 F250 with upgraded 200 amp alternator vs standard 160 amp alternator (part of the snow plow package). I was thinking of installing a 40 amp DC-DC charger but some of what I am reading makes me think I should scale back to 30 or 20 amp because the current is higher from the alternator. Any recommendations?
My 5er currently has 200 amp hour lithium - no solar - but I could see myself going to more batteries in the future.
Pros & cons of connecting a DC-DC charger to the 7 pin at 18 or 20 amps vs 30+ amp charger from the engine bay?
Keith
My 5er currently has 200 amp hour lithium - no solar - but I could see myself going to more batteries in the future.
Pros & cons of connecting a DC-DC charger to the 7 pin at 18 or 20 amps vs 30+ amp charger from the engine bay?
Keith
More Turbo
Joined: Mar 2022
Posts: 580
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Does the manual state the max current rating for the seven pin connector? Personally I would run a dedicated circuit from under the hood to a DC to DC charger to handle the fifth wheel but I tend to over engineer everything
Hotshot
Joined: Oct 2015
Posts: 19,698
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From: Wyoming
Laughing Gas
Joined: Aug 2018
Posts: 942
Likes: 149
Even though our Super Duty had dual alternators, I limited the DC 2 DC charging to 30 AMPS. I had no trouble running our 12' AC/Propane refrigerator on AC and keeping two Battle Born 100 AMP batteries charged while towing.
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Laughing Gas
Joined: Jan 2022
Posts: 1,101
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Is there a problem going from the driver's side battery? It seems the more convenient route to me. I do notice the DS battery is not grounded near it but it seems to be connected to the PS battery where there is a frame connection. I think I will add a frame connection to the DS battery, run the 12v to the Anderson connector in the back along with a local ground from the Anderson.
Laughing Gas
Joined: Aug 2018
Posts: 942
Likes: 149
Here's a thread to my build. It may answer some questions. I'm not going to defend how I did it, but if I did it again I would do it just the same.
Anderson Powerpole Plugs - Ford Truck Enthusiasts Forums (ford-trucks.com)
Anderson Powerpole Plugs - Ford Truck Enthusiasts Forums (ford-trucks.com)
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Hotshot
Joined: Oct 2015
Posts: 19,698
Likes: 12,823
From: Wyoming
There's a way to measure the resistance going to one battery or the other, I simply don't have the tools or knowhow to do it. If it was me, I would pick the closest battery to reduce the amount of wire necessary.
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Laughing Gas
Joined: Jan 2022
Posts: 1,101
Likes: 503
My thoughts too. And really it's about the same from either battery as long as I put the Anderson Connector on matching side. Buy, I'd prefer to have all the trailer cables going to the same area in the truck. That's why I plan to go from the DS battery.
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