Best setup for external 12v A/C using Truck 24v system?

Hi to everyone. Any help appreciated.

I'm trying to build a system for my truck which did not come with an air condition unit. The truck has a 24v 90 amp alternator. The AC unit that I have uses 12v; the compressor can draw up to 70 amps. I am trying to get the best setup possible in order to accomplish this.

I have an Orion Smart Charger 24/12 20 amps, and a DC to DC Converter (Higher Power) 24/12 70 amps. I'm exploring the two setups based on the images below. Any suggestions on how I can make this setup better is appreciated.

I am considering getting another converter. I assume this would produce 140 amps possibly and I wouldn't necessarily need that much. Lastly fuses would be installed near sources/inputs.

Setup 1

Setup 2

Setup 3

2 |3000

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kevgermany ♦♦ commented · Feb 04 at 02:42 AM

Couple of comments

Charge rate to aircon system is very low, max only 20A. You'll need to run the engine for about 3 times as long as the aircon runs.

Likely that the batteries for aircon are undersized for such a large continuous load. You need to check battery specs, but unless they're lithium, you'll get nowhere near the rated capacity due to the high current. Heat will be another issue.

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