In user setup on the Duo3, you can specify 1C thru 5C charge rates. Then when you set up a lipo to charge, you'll have whatever C rate you specified in user setup.

Duo3 takes a 14.5+v input to be able to run at the maximum 360watts (180 x 2). See the manual, bottom of the 1st page where it lists "DC Input required for max watts output" for their current chargers. You need about 450watts to run it at max capability, but the 14.5+v input required is not typical for an RC oriented power supply.