Here’s a list of blogs that has helped me configure Power Pivot for SharePoint 2010 and 2013
SharePoint 2013 Kereberos setup http://blog.blksthl.com/2012/09/26/the-first-kerberos-guide-for-sharepoint-2013-technicians/#step4
Installing 2013 BI features : http://blogs.msdn.com/b/querysimon/archive/2012/11/26/installing-the-bi-features-of-sharepoint-2013.aspx
Notes: things get tricky in a multi server farm. the SQL install will have all the features needed for SharePoint. For SharePoint 2013 there is a spPowerPivot.msi you can use on the WFEs instead of the SQL server install.