Alternator output for dc to dc charging

[Mini]

I’m interested in adding dc to dc charging to my 2024 F150 5 liter with a 200 amp alternator. I’m wondering how many watts would be available to charge the house batteries after the vehicle loads are met? I’d like to size the dc to dc to watts available verses over sizing and not providing enough watts for the alternator.

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[Buyer2021]

I’m wondering how many watts would be available to charge the house batteries after the vehicle loads are met?

Not trying to be 'flip', but the fact is, that number varies while driving depending on a variety of truck operating conditions. Even the maximum possible value is difficult if not impossible to determine.

Consider sizing the DC/DC charger based on the limiting ampacity and voltage-drop of the charging circuit between the truck alternator and the trailer battery (based on gauge and length of the wires and considering the amp-rating of any fuses in the truck on that circuit).

Note that some Victron Smart DC/DC chargers allow user-configuration of the maximum amp load they will present to the vehicle in small increments (up to the stated maximum nominal rating).

 

[EricR]

Or, you could use the Pro Power on Board to feed an AC/DC charger.

The 60A charger I'm using will charge my 210Ah of LiFePO4 batteries from near flat to full in just over 4 hours.

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