Originally Posted by OnTheGo
I put 30 amps in and get 60 amps out. I did a search for the difference between a DC and AC amp, but I don't understand the answers.
I presume that you mean that it is rated for 30 amps on the 120 volt AC input (seems a bit high) and 60 amps DC (at 12 volts) on the output?
The simple answer is that Power (VA) = Volts x amps.
12 volts DC x 60 amps = 720 volt amps or 720 watts of power.
To get 720 watts of power from a 120 volt AC power source it works out to 6 amps or 120 volts x 6 amps = 720 volt amps.
The higher voltage on the input of your converter needs less amps to do the same work.
That is ignoring many losses and other factors which apply in the real world.
AC power is transmitted over lines on the big transmission towers at voltages like 115 KV (115,000 volts), 230 KV, 345 KV and 750 KV for the very reason that by getting the voltages that high the amps, or current, reduce significantly. To transmit power at the 120 volt AC which you need for use in your home would take very large wire and have significant losses. Just my 2 cents. vic
Edit: I'm a slow typist. What RVHiker said.