The feature of LCD graphic symbol
1. The default night display of controller: When the solar
panel input voltage have been detected by controller
less than sensor identification point voltage, this
graphic symbol will be light.
2. The default daytime display of controller: When the
solar panel input voltage have been detected by
controller more than sensor identification point voltage,
this graphic symbol will be light.
3. The indicator of PV array parameter: When the solar
panels data was displaying, this graphic symbol will be
light. For example the voltage of solar panel.
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