Fix mppt algorithm #148

Job	Run time
generate-matrix	6s
run-tests (obdh_test, obdh_unit_test, ./firmware/tests/devices/obdh_unit_test)	27s
run-tests (current_sensor_test, current_sensor_unit_test, ./firmware/tests/devices/current_sensor...	10s
run-tests (power_conv_test, power_conv_unit_test, ./firmware/tests/devices/power_conv_unit_test)	19s
run-tests (watchdog_test, watchdog_unit_test, ./firmware/tests/devices/watchdog_unit_test)	8s
run-tests (leds_test, leds_unit_test, ./firmware/tests/devices/leds_unit_test)	12s
run-tests (heater_test, heater_unit_test, ./firmware/tests/devices/heater_unit_test)	8s
run-tests (voltage_sensor_test, voltage_sensor_unit_test, ./firmware/tests/devices/voltage_sensor...	15s
run-tests (ttc_test, ttc_unit_test, ./firmware/tests/devices/ttc_unit_test)	13s
run-tests (temp_sensor_test, temp_sensor_unit_test, ./firmware/tests/devices/temp_sensor_unit_test)	9s
run-tests (mppt_test, mppt_unit_test, ./firmware/tests/devices/mppt_unit_test)	9s
run-tests (battery_monitor_test, battery_monitor_unit_test, ./firmware/tests/devices/battery_moni...	14s
run-tests (media_test, media_unit_test, ./firmware/tests/devices/media_unit_test)	13s
	2m 43s

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