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I'm looking to add a 40 or 50 amp DC-DC charger to charge my travel trailer's batteries when solar can't keep up.

 

Does the alternator have enough capacity at idle to support the load?

 

I want to say yes, as the onboard AC outlets are rated 400W, so 30ish amps at 13.5v, but can't find any data to back up my assumption.

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