How to find which SQL server instance is consumimg more CPU on 4 node / 20 instance Windows cluster?
Glenn Berry has a set of DMV scripts, in each of them there is a CPU utilization for the last 256 minutes for the instance (query number 40 for SQL 2016 script). Run this on each instance. And if you have CMS setup correctly, you can run the script against a group of instances at the same time.
the link to Glenn Berry's page:
http://www.sqlskills.com/blogs/glenn/sql-server-diagnostic-information-queries-for-september-2016/