Add missing parameters to returns statement in ivtools.sdm.fit_desoto_sandia (#2317)

* add parameters, capital letters...

* correct units and reference

* units

* Update pvlib/ivtools/sdm.py

Co-authored-by: Kevin Anderson <[email protected]>

* Update pvlib/ivtools/sdm.py

Co-authored-by: Cliff Hansen <[email protected]>

---------

Co-authored-by: Kevin Anderson <[email protected]>
Co-authored-by: Cliff Hansen <[email protected]>

Author: 3 people

pvlib/ivtools/sdm.py

@@ -562,27 +562,34 @@ def fit_desoto_sandia(ivcurves, specs, const=None, maxiter=5, eps1=1.e-3):
     -------
     dict
         I_L_ref : float
-            light current at STC [A]
+            Light current at STC [A]
         I_o_ref : float
-            dark current at STC [A]
+            Dark current at STC [A]
         EgRef : float
-            effective band gap at STC [eV]
+            Effective band gap at STC [eV]
         R_s : float
-            series resistance at STC [ohm]
+            Series resistance at STC [ohm]
         R_sh_ref : float
-            shunt resistance at STC [ohm]
+            Shunt resistance at STC [ohm]
         cells_in_series : int
-            number of cells in series
+            Number of cells in series
         iph : array
-            light current for each IV curve [A]
+            Light current for each IV curve [A]
         io : array
-            dark current for each IV curve [A]
+            Dark current for each IV curve [A]
         rs : array
-            series resistance for each IV curve [ohm]
+            Series resistance for each IV curve [ohm]
         rsh : array
-            shunt resistance for each IV curve [ohm]
+            Shunt resistance for each IV curve [ohm]
+        a_ref : float
+            The product of the usual diode ideality factor (n, unitless),
+            number of cells in series (Ns), and cell thermal voltage at
+            reference conditions, in units of V.
+        dEgdT : float
+            The temperature dependence of the energy bandgap (Eg) at reference
+            conditions [1/K].
         u : array
-            boolean for each IV curve indicating that the parameter values
+            Boolean for each IV curve indicating that the parameter values
             are deemed reasonable by the private function ``_filter_params``
 
     Notes