If you are going to do that much work, think about replacing the converter. If memory holds, the converter used in that email of Triple E was connected to the battery but in no way could be described as a smart charger. I also remember mine had both 12 volt and 115 volt lights.
I remember using an adaptor so i think the panel was 30 amp. Look at the size of your main breaker and it will indicate. Also check the panel nameplate, if it is still there.
Not hard if you have someone that can guide you. It will be a good learning experience.