If you leave it as an EPW file, the weather converter assumes that everything is okay. It will convert some things, such as dew point or relative humidity if those values are "missing" but not, I think, the solar values.

You will need to input it as a "custom" with a "definitions" file to get it to effect a split in solar. Here is a link to the StdEPWDefFormat.def and here is the content:

&wthdata
NumInHour=1
InputFileType='CUSTOM'
InFormat='DELIMITED'
DataElements=year,month,day,hour,minute,datasource,Dry_Bulb_Temperature,Dew_Point_Temperature,Relative_Humidity,Atmospheric_Pressure,Extraterrestrial_Horizontal_Radiation,Extraterrestrial_Direct_Normal_Radiation,Horizontal_Infrared_Radiation_Intensity_from_Sky,Global_Horizontal_Radiation,Direct_Normal_Radiation,Diffuse_Horizontal_Radiation,Global_Horizontal_Illuminance,Direct_Normal_Illuminance,Diffuse_Horizontal_Illuminance,Zenith_Luminance,Wind_Direction,Wind_Speed,Total_Sky_Cover,Opaque_Sky_Cover,Visibility,Ceiling_Height,Present_Weather_Observation,Present_Weather_Codes,Precipitable_Water,Aerosol_Optical_Depth,Snow_Depth,Days_Since_Last_Snow,Albedo,Liquid_Precipitation_Depth,Liquid_Precipitation_Quantity
DataMissingValues=99999,99,99,99,99,,999,999,999,999999,9999,9999,9999,9999,9999,9999,999900,999900,999900,9999,999,999,99,99,9999,99999,9,999999999,999,0.999,999,99,999,999,99
DataUnits='x','x','x','x','x','x','C','C','%','Pa','Wh/m2','Wh/m2','Wh/m2','Wh/m2','Wh/m2','Wh/m2','lux','lux','lux','Cd/m2','deg','m/s','tenths','tenths','km','m','x','x','mm','{.001}','cm','x','{.01}','mm','hr'
DataConversionFactors=1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
DelimiterChar=','
/

&miscdata
Comments1='Standard EPW Custom def format'
SourceData='EPW'
/

&datacontrol
NumRecordsToSkip=8
MaxNumRecordsToRead=8784
MissingWindDirAction=RANDOM
/

! Other options on datacontrol:
! MissingDataAction
! MissingWindDirAction
! MissingWindDirValue
! MissingOpaqueSkyCoverAction
! MissingOpaqueSkyCoverValue
! MaxWindSpeed
! MaxDirectSolar
! MaxDiffuseSolar
! MaxIlluminanceValue
! GenerateSolarRadiationWarnings
! GenerateIlluminanceWarnings
! MinDBTempByMonth
! MaxDBTempByMonth
! MinDPTempByMonth
! MaxDPTempByMonth

Linda

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