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Menu 4：Display the current controller temperature
Long Press
①°F；②°C
Setting method: Same as above.
Note: The system defaults to °F.
Menu 5：Display solar panel output voltage
Note: The voltage value only can be read, but cannot be adjusted; this
voltage is the output voltage of the solar panel. In PWM working mode,
this voltage will be automatically adjusted to be the same as the battery
charging voltage, and the open-circuit voltage of the solar panel will be
displayed when not charging;
Menu 6：Error Code
11
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Do you have a question about the PWM NEGATIVE GROUND and is the answer not in the manual?