New module fixtures for test_singlediode

Do not rely on the SAM module database, as parameters there may change
with future updates.

Author: Peque

pvlib/test/conftest.py

@@ -247,3 +247,73 @@ def cec_module_cs5p_220m():
         'Technology': 'Mono-c-Si',
     }
     return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_module_spr_e20_327():
+    """
+    Define SunPower SPR-E20-327 module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'SunPower SPR-E20-327',
+        'BIPV': 'N',
+        'Date': '1/14/2013',
+        'T_NOCT': 46,
+        'A_c': 1.631,
+        'N_s': 96,
+        'I_sc_ref': 6.46,
+        'V_oc_ref': 65.1,
+        'I_mp_ref': 5.98,
+        'V_mp_ref': 54.7,
+        'alpha_sc': 0.004522,
+        'beta_oc': -0.23176,
+        'a_ref': 2.6868,
+        'I_L_ref': 6.468,
+        'I_o_ref': 1.88e-10,
+        'R_s': 0.37,
+        'R_sh_ref': 298.13,
+        'Adjust': -0.1862,
+        'gamma_r': -0.386,
+        'Version': 'NRELv1',
+        'PTC': 301.4,
+        'Technology': 'Mono-c-Si',
+    }
+    return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_module_fs_495():
+    """
+    Define First Solar FS-495 module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'First Solar FS-495',
+        'BIPV': 'N',
+        'Date': '9/18/2014',
+        'T_NOCT': 44.6,
+        'A_c': 0.72,
+        'N_s': 216,
+        'I_sc_ref': 1.55,
+        'V_oc_ref': 86.5,
+        'I_mp_ref': 1.4,
+        'V_mp_ref': 67.9,
+        'alpha_sc': 0.000924,
+        'beta_oc': -0.22741,
+        'a_ref': 2.9482,
+        'I_L_ref': 1.563,
+        'I_o_ref': 2.64e-13,
+        'R_s': 6.804,
+        'R_sh_ref': 806.27,
+        'Adjust': -10.65,
+        'gamma_r': -0.264,
+        'Version': 'NRELv1',
+        'PTC': 89.7,
+        'Technology': 'CdTe',
+    }
+    return parameters

pvlib/test/test_singlediode.py

@@ -11,19 +11,18 @@
 
 POA = 888
 TCELL = 55
-CECMOD = pvsystem.retrieve_sam('cecmod')
 
 
 @requires_scipy
 @pytest.mark.parametrize('method', ['brentq', 'newton'])
-def test_method_spr_e20_327(method):
+def test_method_spr_e20_327(method, cec_module_spr_e20_327):
     """test pvsystem.singlediode with different methods on SPR-E20-327"""
-    spr_e20_327 = CECMOD.SunPower_SPR_E20_327
+    spr_e20_327 = cec_module_spr_e20_327
     x = pvsystem.calcparams_desoto(
         effective_irradiance=POA, temp_cell=TCELL,
-        alpha_sc=spr_e20_327.alpha_sc, a_ref=spr_e20_327.a_ref,
-        I_L_ref=spr_e20_327.I_L_ref, I_o_ref=spr_e20_327.I_o_ref,
-        R_sh_ref=spr_e20_327.R_sh_ref, R_s=spr_e20_327.R_s,
+        alpha_sc=spr_e20_327['alpha_sc'], a_ref=spr_e20_327['a_ref'],
+        I_L_ref=spr_e20_327['I_L_ref'], I_o_ref=spr_e20_327['I_o_ref'],
+        R_sh_ref=spr_e20_327['R_sh_ref'], R_s=spr_e20_327['R_s'],
         EgRef=1.121, dEgdT=-0.0002677)
     il, io, rs, rsh, nnsvt = x
     pvs = pvsystem.singlediode(*x, method='lambertw')
@@ -45,13 +44,14 @@ def test_method_spr_e20_327(method):
 
 @requires_scipy
 @pytest.mark.parametrize('method', ['brentq', 'newton'])
-def test_newton_fs_495(method):
+def test_newton_fs_495(method, cec_module_fs_495):
     """test pvsystem.singlediode with different methods on FS495"""
-    fs_495 = CECMOD.First_Solar_FS_495
+    fs_495 = cec_module_fs_495
     x = pvsystem.calcparams_desoto(
         effective_irradiance=POA, temp_cell=TCELL,
-        alpha_sc=fs_495.alpha_sc, a_ref=fs_495.a_ref, I_L_ref=fs_495.I_L_ref,
-        I_o_ref=fs_495.I_o_ref, R_sh_ref=fs_495.R_sh_ref, R_s=fs_495.R_s,
+        alpha_sc=fs_495['alpha_sc'], a_ref=fs_495['a_ref'],
+        I_L_ref=fs_495['I_L_ref'], I_o_ref=fs_495['I_o_ref'],
+        R_sh_ref=fs_495['R_sh_ref'], R_s=fs_495['R_s'],
         EgRef=1.475, dEgdT=-0.0003)
     il, io, rs, rsh, nnsvt = x
     x += (101, )