Got my answer. Had to get it directly from RLSS though. Very disappointed in the lack of response from Jeremy to both this thread and my PM. Not even so much as to say "sorry, I do not know". I read so much great things about Jeremy and all the help he is. Not the best first impression for this reefer.
For those that want to know. Rlss states that it is indeed capable of being ran externally. They also state that the lowest setting is roughly 50% of the highest setting.