Michael had the answer. Put the SQL Cluster offline using the cluster administrator. This will stop the SQL services.
You can then close down the cluster. Shut down the passive nodes first to prevent the Windows part of the cluster from doing a failover. Then shut down the active node.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 1 Dec 2016
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