Fronius Symo GEN24 3.0, Operating Instructions Manual, Page: 20 / 144

Energy saving mode
General Energy saving mode (standby mode) is used to reduce the self-consumption of the sys-
tem. Both the inverter and the battery automatically switch to energy saving mode under
certain conditions.
The inverter switches to energy saving mode if the battery is flat and no PV power is
available. Only the inverter's communication with the Fronius Smart Meter and Fronius
Solar.web is maintained.
Switch-off condi-
tions If all the switch-off conditions are met, the battery switches into energy saving mode with-
in ten minutes. This time delay ensures that the inverter can at least be restarted.
The battery state of charge is less than or equal to the input minim-
um state of charge.
The current charging or discharging power of the battery is less
than 100 W.
Less than 50 W is available for charging the battery. The power of
feeding into the public grid is at least 50 W less than the power cur-
rently required in the home network.
The inverter automatically switches into energy saving mode, following the battery.
Switch-on condi-
tions If one of the following conditions is met for at least 30 seconds, energy saving mode is
ended:
-
Energy saving mode is no longer permissible owing to a changed setting on the user
interface of the inverter.
- If dynamic power reduction of 0 is set, or if the system is operating in backup power
mode, the power of feeding into the public grid is always less than the required
power in the home network.
There is a separate condition for this case (dynamic power reduction < 300 W or
active backup power mode): if the PV power is above a specified threshold, energy
saving mode is ended.
- Battery charging from the public grid is requested via the website.
- The battery is being recharged in order to restore the minimum state of charge or
perform calibration.
Special case If the inverter does not operate for 12 minutes (e.g. fault), or there is an interruption in
the electrical connection between the inverter and the battery and there is no backup
power mode, the battery switches to energy-saving mode in any case. This reduces self
discharge of the battery.
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