On a new installation of PowerPivot for SharePoint, you must install and deploy solutions to the farm. Application solutions ...

On a new installation of PowerPivot for SharePoint, you must install and deploy solutions to the farm. Application solutions are installed first, but deployed in a subsequent step when you configure integration at the application level. If you run additional web applications in your farm, you must use Central Administration to deploy PowerPivot application solutions to those aplications.