Njoy Ranger 30KR User Manual page 12

3.2. Screen Description
After initialization, the LCD will display main screen. There are five sub-
menus: Control, measure, setting, information and data log. Touch any
sub-menu icon to enter into the sub-screen.
3.1 Button Operation
1) Before operation, make sure that the two strings of batteries are
connected correctly in order of "+,GND,-" terminals and the breaker of the
battery pack is at "ON" position (only for long-run model).
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