Alternator size

I have been trying to figure out a problem with my electrical system and thanks to all that have given me tips.
I pulled my alt out last night to look at the brushes and found a stick on label that reads the voltage at a certain rpm.
I was unsure of what capacity I had so this post is to double check.
The label reads 6000 rpm....57 amps
2000 rpm....28 amps
I assume the rebuilder tagged it and that is is a 60 amp alternator. But the amps seem low at 2000 rpm and what would they be at idle..next to nothing?
Does this seem right? To run my lights and electric fan, no wonder it drops to 11.5 when both are on.
Thanks
AL