Good advice frankykeno, I also concur that your temperatures and humidity are a bit low. this can cause a ball not to eat. Especially a male. Also I agree large rats are too much for most Ball Pythons. The Noatural food in the wild for them is Praomys natalensis and they do not in the wild get bigger than a small rat.
So while it is obvoiusly not your current; problem it may have been the origonal problem.
If the temeperature does not change the eating habit. This may sound funny but put him in a pillow case and take him for a ride for the day. Just get him out of the cage, Out of the house and take him with you wherever you go for a day... When you bring him home out him in his cage . And feed him late that evening..I cant tell you why it works but often it does.
If not give me a call I can run over all of the other 100"s of things to try with you... Just too many to type out.. It is time to get concerned after 11 months.
Michael Cole
Ballroom Pythons South