Wiring trailer for 120vac and 12vdc, do I need two breakers?

snowmanx said:

Going to install a 30amp system, and can't quite figure everything out....when my shore power comes into the breaker box, do I need two 15 amp breakers? One to go to the 12v panel system, and the other to go to 120v accessories like AC and outlets?

Or, just a 30 amp breaker, but then can I feed to hot wires from the panel, one to the 120v, one to the 12v fuse panel?

Thanks in advance.

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Ac and dc are completely different. 12v needs battery's and 120 needs shore power. U can use a rv power converter. U run shore power to it and it converts from ac to dc and also charges batters. Plus it has ac fuse panel and a dc fuse panel. I am in the process of installing 1 in my trailer now. Here is what I am using:
http://www.ebay.com/itm/NEW-PROGRES...Parts_Accessories&vxp=mtr&hash=item2335fc1653

You definitely need to break it down into at least two 15 amp breakers. the only thing on an R.V. that would require a larger breaker than 15 amps would be an A.C. unit. With only an outlet or two and 12 volt converter/charger you will not draw 30 amps ever. If you put too large of a breaker for your max amperage draw you risk catching fire if your equipment has something wrong with it. Basically if you have a problem with your wiring or equipment it could heat up and catch fire before it draws enough amps to trip the breaker.