fixup! Add CEC inverter parameters fixture

Author: Peque

pvlib/test/test_pvsystem.py

@@ -1296,13 +1296,34 @@ def test_snlinverter_float(cec_inverter_parameters):
     assert_allclose(pacs, 132.004278, 5)
 
 
-def test_snlinverter_Pnt_micro(cec_inverter_parameters):
+def test_snlinverter_Pnt_micro():
+    """
+    Test for issue #140, where some microinverters were giving a positive AC
+    power output when the DC power was 0.
+    """
+    inverter_parameters = {
+        'Name': 'Enphase Energy: M250-60-2LL-S2x (-ZC) (-NA) 208V 208V [CEC 2013]',
+        'Vac': 208.0,
+        'Paco': 240.0,
+        'Pdco': 250.5311318,
+        'Vdco': 32.06160667,
+        'Pso': 1.12048857,
+        'C0': -5.76E-05,
+        'C1': -6.24E-04,
+        'C2': 8.09E-02,
+        'C3': -0.111781106,
+        'Pnt': 0.043,
+        'Vdcmax': 48.0,
+        'Idcmax': 9.8,
+        'Mppt_low': 27.0,
+        'Mppt_high': 39.0,
+    }
     vdcs = pd.Series(np.linspace(0,50,3))
     idcs = pd.Series(np.linspace(0,11,3))
     pdcs = idcs * vdcs
 
-    pacs = pvsystem.snlinverter(vdcs, pdcs, cec_inverter_parameters)
-    assert_series_equal(pacs, pd.Series([-0.02, 132.004278492, 250.0]))
+    pacs = pvsystem.snlinverter(vdcs, pdcs, inverter_parameters)
+    assert_series_equal(pacs, pd.Series([-0.043, 132.545914746, 240.0]))
 
 
 def test_PVSystem_creation():