Large ET value.

[jdc]

Nothing major, but perhaps 3 times in the last year the ET value displays '1664.5' for a period of a few hours. The VP2 console shows '0.0' at the same time. I have not noted any particular conditions when this occurs.

I have never restarted Cumulus (currently Cumulus v.1.9.4 build:1086), but allowed the value to restore by itself, which it does. Today I restarted Cumulus and it remained after restart.
Just curious as to whether this will accumulate and raise the daily ET figure in the dayfile?

Thanks

John

Screenshot

[steve]

The ET value does do odd things from time to time; I can't remember whether I ever worked out whether the issue is in the Davis DLL or the console firmware.

Cumulus doesn't do the accumulation of ET, it just reads the annual figure and logs the difference between the current value and the start of day value, just as it does with rainfall. So the value that gets logged to dayfile.txt will be whatever it happens to be at the end of the day.

[jdc]

Thank you, Steve. As I said, not major.

I'll check the annual figure on the console this evening to see by how much it has increased.

[steve]

If you look in today.ini, you can see the current and start of day figures for the annual counter (as they were supplied to Cumulus). Mine look like this at the moment:

[ET]
Annual=606.704406738281
Startofday=606.348815917969

[mcrossley]

I've noticed that it can be negative for a while at the start of the day.

[jdc]

Just FYI, from today.ini :
[ET]
Annual=2319.78198242188
Startofday=655.269226074219

SoD agrees with console, which accounts for the 1664.5!