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Old 07-27-2023, 03:01 AM   #1
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Default How robust are our alternators?

I tow an RV trailer with lithium batteries and while I have solar for primary charging I'm thinking of adding a DC-DC charger to top them off if weather isn't cooperating. From what I gather, we have 220 amp alternators in the CD. Would it be safe to add a 40 amp DC-DC converter or should I go with a 20 amp model?
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Old 01-15-2024, 10:00 AM   #2
Just two
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Join Date: Oct 2023
Location: Northern
Posts: 204
Default Go for it

Best hookup for b2b is to add a switch to turn it on at highway speed. The alternator gets hottest under load at idle. I was able to use a 40 amp b2b on a 190 amp alternator for over 5 years by just running it at high speed. Love the ability to charge the house batteries from the engine.

Good luck.
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