def test_parallel_connected_mj_cells_2(self):
"""
Try connecting two strings of cells. All are Eg=1.42 SQCell.
Each string has five cells. One string has a cell has only 0.5 sun.
:return:
"""
normal_cell = SQCell(eg=1.42, cell_T=300, plug_in_term=rev_diode)
normal_cell.set_input_spectrum(load_astm("AM1.5d"))
low_current_cell = SQCell(eg=1.42, cell_T=300, plug_in_term=rev_diode)
low_current_cell.set_input_spectrum(load_astm("AM1.5d") * 0.5)
# A trick is used here to configure MJCell. The MJCell is not illuminated.
# But each of the subcell is illuminated individually.
tj_cell_1 = MJCell([copy.deepcopy(normal_cell) for i in range(4)] + [copy.deepcopy(low_current_cell)])
tj_cell_2 = MJCell([copy.deepcopy(normal_cell) for i in range(5)])
iv_funcs = [tj_cell_1.get_j_from_v, tj_cell_2.get_j_from_v]
parallel_v, parallel_i = solve_parallel_connected_ivs(iv_funcs, vmin=-2, vmax=6, vnum=30)
volt = np.linspace(-2, 6, num=30)
curr_1 = tj_cell_1.get_j_from_v(volt)
curr_2 = tj_cell_2.get_j_from_v(volt)
plt.plot(volt, curr_1, '.-', label="string 1")
plt.plot(volt, curr_2, '.-', label="string 2")
plt.plot(parallel_v, parallel_i, '.-', label="parallel-connected string")
plt.ylim([-600, 0])
plt.legend()
plt.show()
def test_mj_j_from_v(self):
"""
Test MJCell.get_j_from_v()
:return:
"""
sq1_cell = SQCell(eg=1.87, cell_T=300, plug_in_term=rev_diode)
sq2_cell = SQCell(eg=1.42, cell_T=300, plug_in_term=rev_diode)
sq3_cell = SQCell(eg=1.0, cell_T=300, plug_in_term=rev_diode)
tj_cell = MJCell([sq1_cell, sq2_cell, sq3_cell])
tj_cell.set_input_spectrum(load_astm(("AM1.5d")))
solved_mj_v, solved_mj_i = tj_cell.get_iv()
volt = np.linspace(2.5, 5, num=300)
solved_current = tj_cell.get_j_from_v(volt, max_iter=3)
interped_i = np.interp(volt, solved_mj_v, solved_mj_i)
print(solved_current - interped_i)
plt.plot(volt, interped_i, '.-')
plt.plot(solved_mj_v, solved_mj_i, '.-')
plt.plot(volt, solved_current, '.-', label='get_j_from_v', alpha=0.3)
plt.ylim([-200, 0])
plt.legend()
plt.show()