edit the Note

pvlib/pvarray.py

@@ -253,7 +253,6 @@ def huld(effective_irradiance, temp_mod, pdc0, k=None, cell_type=None):
 
         P_{dc} &= G' ( P_{dc0} + k_1 \log(G') + k_2 \log^2 (G') + k_3 T' +
                  k_4 T' \log(G') + k_5 T' \log^2 (G') + k_6 T'^2)
-        :label: main
 
         G' &= \frac{G_{poa eff}}{1000}
 
@@ -287,11 +286,17 @@ def huld(effective_irradiance, temp_mod, pdc0, k=None, cell_type=None):
 
     Notes
     -----
-    Eq. :eq:`main` is from [1]_. The expression used in PVGIS documentation is
-    different, factoring :math:`P_{dc0}` out of the polynomial. PVGIS
-    documentation shows a table of default parameters :math:`k'` for different
-    cell types. The parameters :math:`k'` differ from the parameters expected
-    by :py:func:`huld` by the factor ``pdc0``, that is,
+    The equation for :math:`P_{dc}` is from [1]_. The expression used in PVGIS
+    documentation is differs by factoring :math:`P_{dc0}` out of the
+    polynomial:
+
+    ..math::
+        P_{dc} = G' P_{dc0} (1 + k'_1 \log(G') + k'_2 \log^2 (G') + k''_3 T' +
+                 k'_4 T' \log(G') + k'_5 T' \log^2 (G') + k'_6 T'^2)
+
+    PVGIS documentation shows a table of default parameters :math:`k'` for
+    different cell types. The parameters :math:`k'` differ from the parameters
+    :math:`k` expected by :py:func:`huld` by the factor ``pdc0``, that is,
 
     .. math::
 
@@ -304,13 +309,13 @@ def huld(effective_irradiance, temp_mod, pdc0, k=None, cell_type=None):
         - the Martin and Ruiz model for the incidence angle modifier (IAM)
           :py:func:`pvlib.iam.martin_ruiz`
         - a custom model for a spectral adjustment factor
-    The PVGIS API (see :py:func:`pvlib.iotools.pvgis.get_pvgis_hourly) returns
+    The PVGIS API (see :py:func:`pvlib.iotools.pvgis.get_pvgis_hourly`) returns
     broadband plane-of-array irradiance (``poa_global``) and DC power (``P``).
     ``poa_global`` is irradiance before applying the IAM and spectral
-    adjustments, where as ``effective_irradiance`` input to :py:func:`huld`
-    should be after these adjustments are applied. Users comparing output of
-    :py:func:`huld` to PVGIS' ``P`` should expect differences unless
-    ``effective_irradiance`` is computed the same way as done by PVGIS.
+    adjustments. In contrast the ``effective_irradiance`` for :py:func:`huld`
+    is after these adjustments are applied. Users comparing output of
+    :py:func:`huld` to PVGIS' ``P`` values should expect differences unless
+    ``effective_irradiance`` is computed in the same way as done by PVGIS.
 
     References
     ----------