code: def scale_voltage_current_power(self, data):
          
  
          return scale_voltage_current_power(data,
                                             voltage=self.modules_per_string,
                                             current=self.strings_per_inverter)
docs: Scales the voltage, current, and power of the DataFrames
          returned by :py:func:`singlediode` and :py:func:`sapm`
          by `self.modules_per_string` and `self.strings_per_inverter`.
  
          Parameters
          ----------
          data: DataFrame
              Must contain columns `'v_mp', 'v_oc', 'i_mp' ,'i_x', 'i_xx',
              'i_sc', 'p_mp'`.
  
          Returns
          -------
          scaled_data: DataFrame
              A scaled copy of the input data.