Fronius Symo Advanced 10.0-3 208-240 Operating Instructions Manual page 30

Maximum solar voltage (V)
maximum solar module voltage measured during the observation period.
After pressing the Enter key the voltage values for MPP Tracker 1 and MPP Tracker
2 (MPPT1/MPPT2) are displayed, if MPP Tracker 2 is activated (see 'The Basic menu' -
'The Basic menu entries')
Operating Hours
indicates how long the inverter has been operating (HH:MM).
IMPORTANT! The time must be set correctly for day and year values to be displayed
properly.
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