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Old 12-10-2020, 01:38 PM   #1
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DC-DC chargers?

Any consensus on the best brand and size for a dc-dc charger. Ideally something that would fully charge two the trailers AGM's during a 4-5 hour drive. Is that realistic? TV is a 6.7 F250 with the heavy duty alternator and dual batteries.
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Old 12-10-2020, 01:57 PM   #2
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best OEM is victron energy
http://www.victronenergy.com

they have many different sizes to choose from
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Old 12-10-2020, 05:19 PM   #3
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With your heavy duty alternator, you should do a 40 amp Renogy. That is what GMFL used on the Long Long Honeymoon upgrade. I am using the 20 amp Renogy on my whimpy F150 upgrade.
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Old 12-10-2020, 06:09 PM   #4
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I've had great success with Sterling BTB charger. Lots of sizes to choose from.

https://www.sterling-power-usa.com/b...ychargers.aspx
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Old 12-10-2020, 06:34 PM   #5
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The 40A Renogy is a great DC Charger.
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Old 12-10-2020, 07:50 PM   #6
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A little over a year with the Renogy 40A in my class b and it works wells. I put an on/off switch on the ignition wire so I can keep it off until I'm on the highway. That way I know my dinky 160A "heavy duty" alternator has already topped off my engine battery before supplying juice for the 2 x 100Ah lithiums.
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Old 04-20-2021, 06:44 PM   #7
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I finally had a chance today to test out my 20A DC-DC charger. At idle, to 20A model put out 24 amps at 13.7v. This was on full batteries. I am happy with the results.
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Old 04-22-2021, 11:58 AM   #8
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BTW, I found out the alternator in my truck puts out 200 amps. Not too bad. I think it is because Ford equipped this truck with a 120 volt receptacle in the back seat.
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Old 04-22-2021, 04:30 PM   #9
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Orion 12/12 Isolated 18 amp test today

With batteries at 97% according to the Victron Connect App, the batteries were at 13.41v, current was 12 amps, power was 161 watts.

The Orion page showed input voltage of 13.1v and output voltage of 13.6v

All at idle. Haven't checked the wires under load to see if temps will be an issue, but i doubt i'll see much increase in temp at these relatively low numbers.

Still, very happy that current is moving in the correct direction and nothing has burst into flame.
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