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Oh, forgot you were going through a converter, so my last comment doesnt apply. To answer your question, that depends on the radio, but I wouldnt exceed 14.5v.

Might work better on 12v when the engine is running and the voltage is closer to 13.8v. Assuming they aren't already fried.

Thanks for clarifying, makes sense.

Is 70A the input or output? The fuse should be about 1.2 times the max current draw of the device, and the wire should be sized for the fuse. So assuming 70A is the input current, you're looking at around a 90A fuse and 4AWG wire minimum.

Yeah amps is not total power, that would be watts. Houses with 100A panels are 240V which is 10x what a humvee is. However, amps is what burns up wires and causes fires, so dont think its not a big deal only being 24V vs 240V. That being said, I agree 52A seems pretty high for windows. It...

Yes, consider the fact that you can link two 12v batteries in series to make a functional welder, that will tell you what you're dealing with.

Also make sure the wire gauge is sufficient for whatever fuse you are using. There are charts you can look it up.

This will explain everything