Update temperature coefficient in PVDAQ notebooks to -0.0034

[Copilot]

Description

The PVDAQ example notebooks used a temperature coefficient of -0.005 1/K, which is too large for modern silicon modules and not representative of typical datasheet values. Updated to -0.0034 1/K, a more appropriate value for modern silicon cells.

Changes

• Updated gamma_pdc parameter from -0.005 to -0.0034 in three notebooks:
  • docs/degradation_and_soiling_example.ipynb
  • docs/TrendAnalysis_example.ipynb
  • docs/TrendAnalysis_example_NSRDB.ipynb
• Added inline comment: # Temperature coefficient for modern silicon PV modules (1/K)
• Updated docs/sphinx/source/changelog/pending.rst with a new "Documentation" section documenting the temperature coefficient change

This provides a more appropriate default for users adapting these notebooks to their own systems.

Checklist

• Code changes are covered by tests
• Code changes have been evaluated for compatibility/integration with TrendAnalysis
• New functions added to __init__.py
• API.rst is up to date, along with other sphinx docs pages
• Example notebooks are rerun and differences in results scrutinized
• Updated changelog

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Notebook temperature coefficients could be improved</issue_title>
<issue_description>The PVDAQ4 notebooks assume a temperature coefficient of -0.005 1/K. This might be undesirable in two ways:

• -0.005 1/K is rather large in magnitude; a smaller value would probably be more generally suitable if people are leaving it at the default when they swap in their own time series data
• -0.005 1/K doesn't match the datasheet value for this system's modules, so it's not correct for the particular system under test either

After offline discussion it was decided to add an explanatory comment in the notebooks for now, and in the longer term (RdTools 3.0) update the value to something more suitable.

For reference, it seems that the -0.005 1/K value has been carted around ever since 2017 when the notebook was first added (see #17 and specifically 161dec5).

Thanks @adriesse for pointing this out!</issue_description>

<agent_instructions>Modern silicon solar cells have a temperature coefficient of around -0.0034. Let's update the notebook accordingly. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

@mdeceglie Oops, we missed this one in the 3.0 release!

• Fixes Notebook temperature coefficients could be improved #359

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[martin-springer]

@copilot - Update the pending.rst changelog.

[Copilot]

@copilot - Update the pending.rst changelog.

Updated the pending.rst changelog in commit aa338b6. Added a "Documentation" section with details about the temperature coefficient update.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.14%. Comparing base (9d09f90) to head (fb224f3).

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #478   +/-   ##
============================================
  Coverage        96.14%   96.14%           
============================================
  Files               12       12           
  Lines             2280     2280           
============================================
  Hits              2192     2192           
  Misses              88       88           

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