* formatting of diode_params in pandas.DataFrame

Author: tylunel

pvlib/modelchain.py

@@ -8,6 +8,7 @@
 
 from functools import partial
 import warnings
+import pandas as pd
 
 from pvlib import (atmosphere, clearsky, pvsystem, solarposition, temperature,
                    tools)
@@ -453,9 +454,11 @@ def _singlediode(self, calcparams_model_function):
             calcparams_model_function(self.effective_irradiance,
                                       self.cell_temperature))
 
-        self.diode_params = (photocurrent, saturation_current,
-                             resistance_series,
-                             resistance_shunt, nNsVth)
+        self.diode_params = pd.DataFrame({'I_L': photocurrent,
+                                          'I_o': saturation_current,
+                                          'R_s': resistance_series,
+                                          'R_sh': resistance_shunt,
+                                          'nNsVth': nNsVth})
 
         self.dc = self.system.singlediode(
             photocurrent, saturation_current, resistance_series,