Have you tried checking the connection at the ISS maybe bad connection or bugs or water ?
weatherlink software is the best tool to use for troubleshooting the VP2+. If you are unable to connect to your station with Weatherlink than something is wrong with your setup.
OP can’t download the WeatherLink software, apparently 
The download link does not work for me. I’ve tried various browsers and networks. I’ve been sent a copy. I’ll work on that. Thanks all. Appreciate the help and input. I’ll work on it with the weatherlink.
Hi There. I’ve downloaded and installed Weatherlink and data is being received. What am I looking for to help solve my WD solar graph display issue please?
Many thanks
Chris
You should be looking for this display and then see what the solar is doing the mouse is pointing to the correct icon to get this display
Note WD and weatherlink cannot download data at the same time you have to run one at a time with the other shut down
Kinda true…but you can run both at the same time. The only catch is if WD needs to download more than a few lost minutes then it is necessary to allow WD to catch up missed data first, then shutdown WD and allow WL to catch up. Once WL is caught up then run WD.
Is WL recording valid solar data?
In the gap the value doesn’t drop to zero so there’s still data coming in from the sensor, just not reflecting the level that should be seen at that time. Are you sure there’s no way that the sensor could be covered by a shadow from something during those times?
Pretty sure. It’s in between 2 houses, suburbia, and I’d like it higher. Photo attached is at 1730hrs. I’ll take one at 1330 tomorrow.
Cheers Chris
Chris
The sun would also be higher in the sky at that time too which makes a shadow less likely. Having said that I can’t think of a reason why you’d see such a big drop for a period. You’re not seeing signal loss because you’re still getting data from the other sensors.
From the picture I assume that is the sun on the right
The pole is a large dia and may well be casting a shadow the other thing is the pole is white and may be reflecting the sun on to the sensor at other time
The other thing I notice is that at the time of the photo you solar panels should still be seeing sun and they are not
I’m obviously not fully awake yet. I looked at the picture and wrongly assumed that the solar sensor was mounted up with the anemometer like mine is 
I agree the pole might be affecting the sensor although I don’t know why that would only start affecting it recently. I was thinking more about a tree growing and obscuring the sensor at specific times of the day.
Cheer bud. The pole isn’t white. It’s a scaff pole, galvanised.
I’ll try and add some more height to it.
At midday check the solar panels are getting the full sun ie facing north as your southern hemisphere I believe
I can’t find where in the logs WD records the actual W/m2 values but you can plot them on the
->view/Solar/UV/ET Real Tmie Graph section. Your screen grabs appear to be showing the solar being graphed in solar% and not W/m2 hence the flatness of the “curve”. Also you can monitor the actual solar values under ->Setup/Solar on the “current readings” tab. Lastly, for the hour or so of low readings, make sure you don’t have WD set to use the shadow offset.
The vantagelog in log files has those values
Plus, it’s been mainly cloudy all day but no big gaps between 1300 and 1400. Seems to be only when it’s sunny.
No gaps when it’s not sunny could point to a shadow issue. When it’s cloudy any solar reaching the sensor will either be diffused or reflected. So it comes from many directions and won’t be blocked by the mast.