The format of the data file includes 10 columns of data
From the first to the last column of the data file, the following data are presented: 
Column 1 Date and UTC time (dd/mm/yyyy hh:mm:ss) 
Column 2 the frequency of the grid (Hz) 
Column 3 the Real power exchanged with the grid P (kW) 
Column 4 the Reactive power exchanged with the grid Q (kVAr)
Column 5 the State of Charge SoC( %)
Column 6 the DC voltage (V)
Column 7 the DC current (A) 
Column 8 the average AC voltage (V) - average of the three line currents
Column 9 the average AC current (A) - average of the three line-to-line voltages
Column 10 the battery ambient temperature (Degrees C)

missing values are shown as -999.

Note : when opening the data files in Excel, sometimes the date/time column does not display correctly (even though the data format is as described here) 
– if one sets the format for the columns to be custom DD/MM/YY HH:MM:SS.000, then the data displays correctly.