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Solar: NASA POWER's current acknowledgment, data version and changes

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Use the acknowledgment wording from NASA POWER's referencing page, add the
data reference (Climatology API v2.10.0, downloaded 2026/10/04), and state
how WROLPi modified the data, as CC BY 4.0 requires.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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docs/modules/calculators/solar.md
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@ -173,8 +173,16 @@ models PVWatts uses for panel temperature, angle losses, system losses and inver
## Data source
Sunlight, temperature and ground reflectance come from
[NASA POWER](https://power.larc.nasa.gov/) 2001–2020 monthly averages, on a 1° grid. The data is licensed
[CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). The data was obtained from the National Aeronautics and
Space Administration (NASA) Langley Research Center (LaRC) Prediction of Worldwide Energy Resource (POWER) Project,
funded through the NASA Earth Science/Applied Science Program.
Sunlight, temperature and ground reflectance come from [NASA POWER](https://power.larc.nasa.gov/) 2001–2020
monthly averages, on a 1° grid. The data is licensed
[CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
The data was obtained from National Aeronautics and Space Administration (NASA) Langley Research Center's
Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division. The data
was obtained from the POWER Project's POWER Climatology API v2.10.0 version on 2026/10/04.
WROLPi modified the data: values are rounded to fit one byte each (0.04 kWh/m² per day for irradiance, 0.004 for
albedo, 0.5 °C for temperature), temperatures are averaged from NASA's 0.5° × 0.625° grid into 1° cells, and the
calculator interpolates between cells.
> To see this attribution in the calculator, click **Data attribution** under the location.