//with rebuild system databases - users and databases are dropped so better to detach user databases before
[installation folder]\setup.exe /QUIET /ACTION=REBUILDDATABASE /INSTANCENAME=BIS_SQL /SQLSYSADMINACCOUNTS=INFRABIS\administrator /SQLCOLLATION=Polish_CI_AS /SAPWD=StrongPassword 

//without rebuilding system databases - users and user databases stay but it's advised to detach user databases to speed up process
sqlservr -m -T4022 -T3659 -s"BIS_SQL" -q"Polish_CI_AS"