This Post is part of SharePoint 2010 Installation Series
To increase Excel Services limits:
- Navigate to SharePoint Central Administration > Application Management > Manage Service Applications.
- Select your Excel Service Application.
- On the Ribbon, click Manage.
- Click Trusted File Locations and on the following page, select your trusted location. (Typically, this is listed as http:// in the Address column.)
- In the Workbook Properties area, set the Maximum Workbook Size property to 2000 and the Maximum Chart or Image Size to 100 MB
A Good sample of SharePoint Services is
http://fo-developer-07/Pages/excelservicessample.aspx
Or your services web application url /Pages/excelservicessample.aspx
For more information about using excel services and good examples see this video here
And here