Set the EMI and check the Performance Ratio

This section describes how to set the EMI on Neteco 1000s and what is necessary to configure.

Prerequisites

• You have logged in as the system administrator, manager, installer, or guest user who has been assigned the historical data query permissions.
• Total string capacity has been configured for inverters.
• An environmental monitoring instrument (EMI) is connected to the plant on Smartlogger

Procedure

1. Go to Monitor > select the PV Plant > Settings > Select EMI > choose EMI installed on your plant > OK.
   If you have other plants in the same area you can select Display EMI’s of other plants and you can select one EMI that will be share to the plant.
   NOTE:
   Data from EMI selected here is used to calculate the values of Performance Ratio and Availability, as well as the EMI values of PV Plant Overview, PV Plant Analysis, and Data Export.
   
   
2. On the Performance Ratio Configuration panel modify the Line loss or Module peak power temperature coefficient > click Update Historical PR > Specify Start time and End time > OK
   NOTE:
   Specific Energy, Performance Ratio, and Availability, as well as EMI values of the PV Plant Overview, PV Plant Analysis, and Data Export of the PV plant within the time segments selected are calculated based on the latest parameters.
   
3. Go to Monitor menu > select the inverter on the left panel > Settings > enter the Total string capacity > click Save in the upper right corner. Repeat the procedure for other inverters if the inverters has different string capacity.
   NOTE:
   Click Batch Apply if you need to apply the configured value of Total string capacity to multiple inverters with the same configuration. Then select the target devices in the displayed dialog box and click OK.
4. Check if all the values of the EMI are correctly displayed: Go to Monitor > select the EMI on the left panel > check the EMI values on the Details tab
   
   
5. If all the settings are correct you should have available on the plant Overview page Total irradiance, Performance Ration and Specific Energy.
   
   
6. To query the PV plant Performance Ratio choose Historical Data > Data Analysis from the main menu > choose PV Plant Analysis > Performance Ratio in the navigation tree on the left > click to select the target plant in the operation display area. A maximum of 5 plants can be selected > Set query conditions and click Query. Optional: To export queried data to the PC for viewing, click Export on the Table tab page and save the file to the PC.NOTE:
   The PV plant performance ratio indicates the rated output loss of the PV plant array caused by the following reasons: the temperature and irradiation are not fully used, or system components are invalid or faulty. The performance ratio reflects the overall operation of devices in the PV plant system from the PV module side to the box-type input substation side in the recording time period.