If you do need a converter replacement I have two suggestions
For stand alone (it seems you have one) Progressive Dynamics 9200
For "built into the power center) the 4600
When I got my RV 13 years ago It came with a PD 9180+Wizard (equal to 9200+Dongle) and I hit the web researching to find if there is any better. Still looking, not yet found one. (For Flooded wet cells. if you use different types of battteries there are better choies) when my 9180 failed last Halloween.. I got a Factory Refurb.. Since I was "passing by" more or less. I got it at the factory (Where better?) Very happy with the thing..
It does have one recurring "Failure" mode.. it's a plug in model. You can likely guess (I snag the cord and pull the plug).