I produce about 40% more on a cloudy day vs sunny day. Why?

[svetz]

This is interesting. I will look into this.

What I liked most about it was that there were no moving parts (typically my anemometer would need replacing every couple of years...haven't had this one long enough (only 8 months) to say if it'll actually last).

Surprisingly, of all the weather stations I've bought... this is the first one my wife has ever liked. I wasn't going to let the system publish the data to the internet (it can all be run locally), but she really likes the cellphone app to easily get the actual wind and rainfall information.

Hopefully it is possible to integrate with Home Assistant.

It should be. I don't use HA, I built my own system, but it was pretty easy to hook up. Basically doing a get on http://<local_ip>/get_livedata_info returns JSON of the form id, unit, val; Annoyingly, they sometimes put the units in the value, for example here's two of the 30+ entries:

{"id": "0x02", "unit": "F", "val": "83.1" },​

{ "id": "0x15", "val": "770.40 w/m2"},​

​

A lookup of the id, tells you what it is measuring. For example, '0x15' is 'Solar Radiation', '0x02': 'Outdoor Temperature', '0x07': 'Outdoor Humidity', '0x03': 'Dew point'.

 

[Don B. Cilly]

My horizon line is not currently optimal, there are some trees in the way,

That - and the tilt/azimuth - might be it.
If the panels are shaded from direct sunlight, and at a bad angle, the clouds will play in their favour.
.