When you say that you "overloaded it," it would help greatly to know a little more about just what exactly you did.
Did you short out any wiring to ground somewhere during your project? Did you cross-wire something, (POS to NEG, or vice versa?)
Also, a description of the make and model of converter you have would help too, since they are not all the same.
How many batteries do you have? (Your post implies plural.)
Do you have self-resetting circuit breakers coming off the battery
, (or batteries,) or perhaps replaceable fuses on the (POS) power line before the wiring gets to the converter?
Some converters have TWO
30 Amp fuses that protect the converter in the event the POS and NEG wires are hooked up accidentally to the wrong terminals. Since I don't know what converter you have, you may or may not have this feature.