Yes, that's normal alternator voltage. It will drop a bit on a long drive depending on battery state of charge and what is running but your voltage is pretty much right on.
Now the other side of the new solenoid should be charging the house batteries just fine.
I've even watched the amp load as the alternator is charging with engine running. It can put a heavy amp load out at first, then it stabilizes to the load.
Bill and Brenda + Mobius Big Dog
2018V24D, '13 Tiffin BR32, Tiffin 34TGA, '11 Aspect 30, 06View23H, '00 HHiker II 5W