PVOutput is a free online service for sharing and comparing photovoltaic solar panel output data. It provides both manual and automatic data uploading facilities.
Output data can be graphed, analyzed and compared with other pvoutput contributors over various time periods. The ability to compare with similar systems within close proximity allows both short and longer term performance issues to be easily identified. While pvoutput is primarily focused on monitoring energy generation, it also provides equally capabable facilities to upload and monitor energy consumption data from various energy monitoring devices.