rebase, small fix to pvsystems.py

Author: lboeman

pvlib/pvsystem.py

@@ -2648,9 +2648,9 @@ def adrinverter(v_dc, p_dc, inverter, vtol=0.10):
     mppt_hi = inverter['MPPTHi']
     mppt_low = inverter['MPPTLow']
 
-    v_lim_upper = np.nanmax([v_max, vdc_max, mppt_hi]) * (1 + vtol)
-    v_lim_lower = np.nanmax([v_min, mppt_low]) * (1 - vtol)
-
+    v_lim_upper = float(np.nanmax([v_max, vdc_max, mppt_hi]) * (1 + vtol))
+    v_lim_lower = float(np.nanmax([v_min, mppt_low]) * (1 - vtol))
+    
     pdc = p_dc / p_nom
     vdc = v_dc / v_nom
     # zero voltage will lead to division by zero, but since power is