(EDIT: I am surprised your converter works at all. Definitely don't use it to charge a battery
I have this same unit on my Trillium
4500. The problem with replacing the original converter with a modern one is that there is very little space in that location, less than 4" depth. I found one solution that fits, the Parallax 80D Distribution Panel with a separate converter charger such as a Progressive Dynamics PD9245C converter charger to be located in adjacent space.
Another option is to relocate everything to the adjacent space where the shore power cord is stored. This would give you the option of other converters. Either way, you would also want to upgrade to 30 amp shore power. This would also allow you to have at least two AC branch circuits instead of one, a great benefit if you run more than one high amperage AC appliance.
I plan to upgrade at some point, but meanwhile I have replaced the AC push button circuit breaker with a 15 amp push button circuit breaker. Why? Because it protects the (EDIT: the wiring for the) entire power load in this unit including:
- FOUR AC outlets (one on the converter, two others inside the camper, one in the fridge
- The AC/DC transformer providing power to DC circuits (several lights)
I also replaced the DC push button circuit breaker with a 10 amp push button circuit breaker. Also replaced the toggle switch. Also replaced the transformer with a 15 amp 12 VDC power supply. I use a separate smart charger to charge the battery