I have some questions about entering the forecast data because I’m currently significantly outperforming the forecast and was wondering if I did something incorrectly or if there’s a simple explanation. Here’s a diagram of our install.
and here’s the configuration for each of the forecast segments
[
{
"entry": {
"title": "Solar Panels (Garage)",
"data": {
"latitude": "**REDACTED**",
"longitude": "**REDACTED**"
},
"options": {
"azimuth": 342,
"declination": 39,
"modules power": 4005
}
},
},
{
"entry": {
"title": "Solar Panels (Living Room)",
"data": {
"latitude": "**REDACTED**",
"longitude": "**REDACTED**"
},
"options": {
"azimuth": 252,
"declination": 30,
"modules power": 7565
}
},
},
{
"entry": {
"title": "Solar Panels (Patio)",
"data": {
"latitude": "**REDACTED**",
"longitude": "**REDACTED**"
},
"options": {
"azimuth": 252,
"declination": 14,
"modules power": 3560
}
},
}
]
I used the 18° from north value in the top right of the diagram to get the rough values for the azimuth of each section and used the total capacity of 15130 W * (# of panels / 34) to determine the modules power. For the declination I used the pitch values on the diagram and a pitch calculator I found online.
All of that said I seem to be outperforming my forecast by nearly 2x which seems like something is definitely wrong.
Any help or explanations would be appreciated.
Edit: I think I figured it out. I think my azimuth for the “Garage” panels was off by 180°. Still out performed the forecast for most of the morning, but by a more reasonable amount.
Edit 2: It looks like my original error plus an open issue (Adjust forecast solar data time offset to match by arthurbenemann · Pull Request #13855 · home-assistant/frontend · GitHub) I just discovered which pushes forecast line off by an hour probably explains everything.