def test_2_module_operating_at_low_irradiance_high_temperature(self):
'''
Task 2: Make sure your implementation produces accurate results at
alternative irradiance and temperature levels.
Here we used an irradiance of 600 W/m^2, and a temperature of 45ºC on
the same Trina module as in Task 1.
'''
current = modules.calculate_module_current('TSM PA05', 600, 45, 5)
self.assertAlmostEquals(current, 5.001330819496669)
current = modules.calculate_module_current('TSM PA05', 600, 45, 15)
self.assertAlmostEquals(current, 4.97041290811022)
current = modules.calculate_module_current('TSM PA05', 600, 45, 30)
self.assertAlmostEquals(current, 4.048128130946268)
def test_1_module_operating_at_stc(self):
'''
Task 1: Create a (python) module with functions that describe a
(solar) module. Load the module coefficients for the Trina TSM PA05
from the CSV, set the temperature (T), to 25ºC and the irradiance (S)
to 1000 W/m^2.
This test will pass when you calculate voltage and current matching the
correct numerical values along the (solar) module's I/V curve.
'''
current = modules.calculate_module_current('TSM PA05', 1000, 25, 5)
self.assertAlmostEquals(current, 8.345847070106313)
current = modules.calculate_module_current('TSM PA05', 1000, 25, 25)
self.assertAlmostEquals(current, 8.276615347828452)
current = modules.calculate_module_current('TSM PA05', 1000, 25, 34)
self.assertAlmostEquals(current, 5.3462926879868)
def test_2_optimize_module_power(self):
'''
Task 2: Usually, we don't just need to understand what the potential
output of a solar module is (e.g. the I/V curve), we want to find out
what voltage and current the module should be operating at in order to
produce the most power.
Write a function that determines the voltage and current along a
modules I/V curve that maximizes power.
'''
(voltage, current) = modules.calculate_max_power_point('TSM PA05', 1000)
# numerically check that this is optimal
v_high = voltage + 1e-5
v_low = voltage - 1e-5
i_high = modules.calculate_module_current('TSM PA05', 1000, v_high)
i_low = modules.calculate_module_current('TSM PA05', 1000, v_low)
self.assertGreater(voltage * current, v_high * i_high)
self.assertGreater(voltage * current, v_low * i_low)
def test_1_module_operating_at_stc(self):
'''
Task 1: Create a (python) module with functions that describe a
(solar) module. Load the module coefficients for the Trina TSM PA05
from the CSV.
This test will pass when you calculate voltage and current matching the
correct numerical values along the (solar) module's I/V curve.
'''
current = modules.calculate_module_current('TSM PA05', 1000, 5)
self.assertAlmostEquals(current, 8.345847070106313)
current = modules.calculate_module_current('TSM PA05', 1000, 25)
self.assertAlmostEquals(current, 8.276615347828452)
current = modules.calculate_module_current('TSM PA05', 1000, 30)
self.assertAlmostEquals(current, 7.981905356152154)
current = modules.calculate_module_current('TSM PA05', 1000, 35)
self.assertAlmostEquals(current, 3.9434722231704042)