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You could try:

1. Convert a TMY EPW to CSV, replace the solar columns with custom data, then convert back to EPW.
2. Use the solar EMS actuators here to override the TMY data. I typically use this in conjunction with an EMS sensor tied to a Schedule:File to read a CSV with the raw data.

Check out the weather converted programs documentation for information on creating custom weather files.

You could try:

1. Convert a TMY EPW to CSV, replace the solar columns with custom data, then convert back to EPW.
2. Use the solar EMS actuators here to override the TMY data. I typically use this in conjunction with an EMS sensor tied to a Schedule:File to read a CSV with the raw data.

Check out the weather converted converter programs documentation for information on creating custom weather files.