Fronius Primo GEN24 3.0 Plus, Operating Instructions Manual, Page: 37 / 160

General
Prerequisites for
backup power
mode In order to use the inverter's backup power function, the following prerequisites must be
fulfilled:
-
The inverter must be from the Fronius GEN24 Plus device series.
- A battery suitable for backup power use must be installed and configured.
- Correct cabling of the backup power system in the electrical installation or usage of
a switch box from Enwitec (see chapter
Components for automatic Full Backup
backup power changeover on page 134 or Circuit diagrams on page 143 ).
- Mount and configure the Fronius Smart Meter at the feed-in point.
- Attach a warning notice for the backup power supply (https://
www.fronius.com/en/search-page, item number: 42,0409,0275) on the electrical dis-
tributor.
- Apply the necessary settings in the "Devices and system components" → "Functions
and pins" → "Backup power" menu area and activate backup power.
- Follow the backup power checklist (https://www.fronius.com/en/search-page, item
number: 42,0426,0365) step by step and confirm.
Transitioning
from feeding
energy into the
grid to backup
power mode 1. The public grid is monitored by the inverter's internal grid and system protection unit
and by the Fronius Smart Meter connected to it.
2. The public grid fails or specific grid parameters are dropped below or
exceeded.
3. The inverter carries out the measures necessary according to the country standard
and then switches off.
4. The inverter starts backup power mode after a checking period.
5. All loads in the household that are in the backup power circuit are supplied by the
battery and the PV modules. The remaining loads are not supplied with power and
are safely isolated.
Transitioning
from backup
power mode to
feeding energy
into the grid 1. The inverter is operating in backup power mode.
2. The public grid is functioning correctly again.
3. The Fronius Smart Meter monitors the grid parameters on the public grid and
passes this information to the inverter.
4. The stability of the returned public grid is determined by checking the measured val-
ues of the Fronius Smart Meter.
5. The inverter ends backup power mode.
6. All circuits are reconnected to the public grid and are supplied by the grid.
7. The inverter can start feeding energy into the grid again after performing the grid
checks required by the relevant standard.
Backup power
and energy sav-
ing mode Under the following conditions, the battery and the inverter are switched to energy saving
mode after a waiting time of 8 - 12 minutes and backup power mode is ended:
-
The battery is discharged to the minimum state of charge and no energy is coming
from the PV modules.
- The inverter is set to energy saving mode (standby mode).
If the battery and inverter are in energy saving mode, the system is reactivated by the
following:
-
Enough energy is available from the solar modules.
- The public grid is functioning again.
- The battery is switched off and on.
37
EN