Estimating today's solar…

Est. solar generated

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Est. saving today

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Best hour

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Fetching live weather and solar data…

Estimated output by hour

Tap a bar to show that hour in the picture. For hours that have passed, the dark mark is the estimate updated with satellite sunshine data from the web. It is not a reading from the panels.

ForecastUpdated estimate from satellite data (web, not the panels)

Hour by hour

TimeWeatherEst.

What the estimate is worth

How the estimate works

• Setup: 3 × 465 W panels on a ground frame tilted at 32°, facing south (180°), into an 800 W plug-in inverter.
• Sunlight forecast from Open-Meteo for the panels' exact angle, refreshed each time the page opens.
• Assumes 80% system efficiency. Output can never exceed the inverter's 800 W.
• Each hour is the average power over that hour. These are estimates, roughly ±20–30%, until checked against real panel readings.
• Once an hour has passed, its estimate is updated using sunshine measured by weather satellites (Open-Meteo, usually 20 minutes to 2 hours behind). It is still an estimate from web data, not a reading from the panels or inverter.
• For hours that have passed, the picture and weather words also follow the satellite: how clear the sky was and how much sunshine came straight from the sun. Rain and temperature still come from the weather model, as satellites can't measure them.
• In the picture, blue light is power from the panels to the inverter and green is power going into the house.

Estimates only, not readings from the panels
Weather and solar forecast by Open-Meteo.com
Satellite sunshine data by Open-Meteo, from EUMETSAT and DWD weather satellites
Data licensed under CC BY 4.0