Repository: pvlib/pvlib-python (python)

Issue:
Typo in klucher irradiance model
This change looks like a typo:
https://github.com/pvlib/pvlib-python/commit/1f968a034f74e46f021f3a6b85ea86c5e1ad6cf8#diff-9e2b3ebf5d45c478fee41a88b0e5f44eR671

Pull request description:
Fix #228: dhi/ghi typo

Patch:
diff --git a/pvlib/irradiance.py b/pvlib/irradiance.py
index 5dbf561..1bead15 100644
--- a/pvlib/irradiance.py
+++ b/pvlib/irradiance.py
@@ -628,7 +628,7 @@ def klucher(surface_tilt, surface_azimuth, dhi, ghi, solar_zenith,
     cos_tt = aoi_projection(surface_tilt, surface_azimuth,
                             solar_zenith, solar_azimuth)
 
-    F = 1 - ((ghi / ghi) ** 2)
+    F = 1 - ((dhi / ghi) ** 2)
     try:
         # fails with single point input
         F.fillna(0, inplace=True)
diff --git a/pvlib/pvsystem.py b/pvlib/pvsystem.py
index 6ea3622..f78d481 100644
--- a/pvlib/pvsystem.py
+++ b/pvlib/pvsystem.py
@@ -1193,7 +1193,7 @@ def sapm(effective_irradiance, temp_cell, module):
     A DataFrame with the columns:
 
         * i_sc : Short-circuit current (A)
-        * I_mp : Current at the maximum-power point (A)
+        * i_mp : Current at the maximum-power point (A)
         * v_oc : Open-circuit voltage (V)
         * v_mp : Voltage at maximum-power point (V)
         * p_mp : Power at maximum-power point (W)


Test patch:
diff --git a/pvlib/test/test_irradiance.py b/pvlib/test/test_irradiance.py
index e499497..573ae40 100644
--- a/pvlib/test/test_irradiance.py
+++ b/pvlib/test/test_irradiance.py
@@ -62,7 +62,8 @@ def test_extraradiation(input, expected, method):
 
 @requires_numba
 def test_extraradiation_nrel_numba():
-    irradiance.extraradiation(times, method='nrel', how='numba', numthreads=8)
+    result = irradiance.extraradiation(times, method='nrel', how='numba', numthreads=8)
+    assert_allclose(result, [1322.332316, 1322.296282, 1322.261205, 1322.227091])
 
 
 def test_extraradiation_epoch_year():
@@ -76,7 +77,8 @@ def test_extraradiation_invalid():
 
 
 def test_grounddiffuse_simple_float():
-    irradiance.grounddiffuse(40, 900)
+    result = irradiance.grounddiffuse(40, 900)
+    assert_allclose(result, 26.32000014911496)
 
 
 def test_grounddiffuse_simple_series():
@@ -95,44 +97,52 @@ def test_grounddiffuse_albedo_invalid_surface():
 
 
 def test_grounddiffuse_albedo_surface():
-    irradiance.grounddiffuse(40, ghi, surface_type='sand')
+    result = irradiance.grounddiffuse(40, ghi, surface_type='sand')
+    assert_allclose(result, [0, 3.731058, 48.778813, 12.035025])
 
 
 def test_isotropic_float():
-    irradiance.isotropic(40, 100)
+    result = irradiance.isotropic(40, 100)
+    assert_allclose(result, 88.30222215594891)
 
 
 def test_isotropic_series():
-    irradiance.isotropic(40, irrad_data['dhi'])
+    result = irradiance.isotropic(40, irrad_data['dhi'])
+    assert_allclose(result, [0, 35.728402, 104.601328, 54.777191])
 
 
 def test_klucher_series_float():
-    irradiance.klucher(40, 180, 100, 900, 20, 180)
+    result = irradiance.klucher(40, 180, 100, 900, 20, 180)
+    assert_allclose(result, 88.3022221559)
 
 
 def test_klucher_series():
-    irradiance.klucher(40, 180, irrad_data['dhi'], irrad_data['ghi'],
+    result = irradiance.klucher(40, 180, irrad_data['dhi'], irrad_data['ghi'],
                        ephem_data['apparent_zenith'],
                        ephem_data['azimuth'])
+    assert_allclose(result, [0, 37.446276, 109.209347, 56.965916])
 
 
 def test_haydavies():
-    irradiance.haydavies(40, 180, irrad_data['dhi'], irrad_data['dni'],
+    result = irradiance.haydavies(40, 180, irrad_data['dhi'], irrad_data['dni'],
                          dni_et,
                          ephem_data['apparent_zenith'],
                          ephem_data['azimuth'])
+    assert_allclose(result, [0, 14.967008, 102.994862, 33.190865])
 
 
 def test_reindl():
-    irradiance.reindl(40, 180, irrad_data['dhi'], irrad_data['dni'],
+    result = irradiance.reindl(40, 180, irrad_data['dhi'], irrad_data['dni'],
                       irrad_data['ghi'], dni_et,
                       ephem_data['apparent_zenith'],
                       ephem_data['azimuth'])
+    assert_allclose(result, [np.nan, 15.730664, 104.131724, 34.166258])
 
 
 def test_king():
-    irradiance.king(40, irrad_data['dhi'], irrad_data['ghi'],
+    result = irradiance.king(40, irrad_data['dhi'], irrad_data['ghi'],
                     ephem_data['apparent_zenith'])
+    assert_allclose(result, [0, 44.629352, 115.182626, 79.719855])
 
 
 def test_perez():