Bob, you may well have a low battery, but you should try to figure out why that has happened. From your description of the problem, I'd suspect one or both of the (possibly hidden) 30 Amp fuses in the converter have blown. If so, the battery will NOT receive any recharge power.
I have a thread on finding and replacing those 30 Amp fuses in an Elixir converter here:
https://www.hilotrailerforum.com/f28...d-repair-6454/
They blow rather easily, if you have the converter running while you put a heavy load on the electrical system, such as raising the top, lifting the hitch connection while the trailer is coupled to the truck, etc.
- Jack