@David,
Is there other data like Theoretical vs Actual saved in files? Otherwise, it seems the only important thing is where the Calculated Threshold line lands to save sun hours.
I think that is in the \SunRecords\yyyy\mm\dd folders.
In my latest log from 2019 \SunRecords\yyyy\mm\dd are .dat files that have:
LAT
LON
TZ
DST
SRS 05:47:56 21:00:53 (which is the start and stop time period = 15:12:57 hh:mm:ss)
TOT 00:42:40 00:00:00 (which is the sum of each period of sun during the day = 00 hrs 42 min 40 sec)
SUN 15:45:36 15:51:04 (which is a time period of sun = 05 min 28 sec of sun recorded)
SUN 15:51:32 15:55:54 (which is the next time period of sun = 04 min 22 sec of sun recorded)
and so on for each time period of sun to end of sun, to
NRC 21:00:53 21:00:53 (which is the end time and no more recording.
So SRS time period I assume is theoretical, and the sum of each SUN period is the total actual.
Sorry, my old SR files are on an old Win 8 PC and difficult to attach to this reply post.
For the period May 2017 to Jun 5, 2018, when I had both the B-L and Davis VP2 Plus with solar and UV, I compared the B-L data to the CumulusMX/Davis VP2 Pro solar data in Excel chart. B-L was quite a bit more precise with usually more sunshine recorded.
Enjoy,
Paul