General
Prerequisites for
backup power
mode
IMPORTANT!
If several backup power variants are available, please note that only one backup
power variant may be installed and configured.
In order to use the inverter's backup power function, the following prerequisites
must be fulfilled:
-
The inverter must support the backup power variant – Full Backup (see
chapter Function overview on page 15).
-
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 157 or Circuit diagrams on
page 173).
-
Mount and configure the Fronius Smart Meter at the feed-in point.
-
Attach a warning notice for the backup power supply (https://www.froni-
us.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 en-
ergy into the grid
to backup power
mode
1.
The public grid is monitored by the inverter's internal grid and system pro-
tection unit and by the Fronius Smart Meter connected to it.
2.
The public grid fails or specific grid parameters are dropped below or ex-
ceeded.
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 meas-
ured values 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.
43
EN
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