The teenager's move represents the latest loan transfer out of the Academy, with the deadline rapidly approaching on Monday evening, at 19:00 BST.
Everybody at United wishes Louis the very best of luck for the campaign, with Solihull next in action on Saturday, at home to Southend United.
Travis Binnion's Under-21s play the West Midlands side at Damson Park on 21 October in the National League Cup.