Suitable batteries
General Fronius explicitly points out that the third-party batteries are not Fronius
products. Fronius is not the manufacturer, distributor or retailer of these batter-
ies. Fronius accepts no liability and offers no service or guarantees for these bat-
teries.
Obsolete firmware/software states may lead to incompatibilities between the in-
verter and the battery. In this case, the following steps are to be performed:
1
Update battery software – see the battery documentation.
2
Update inverter firmware – see Update on page 120.
Read this document and the Installation Instructions before installing and com-
missioning the external battery. The documentation is either enclosed with the
external battery or can be obtained from the battery manufacturer or their ser-
vice partners
All documents associated with the inverter can be found at the following ad-
dress:
https://www.fronius.com/en/solar-energy/installers-partners/service-support/
tech-support
Limitations in
operation
If the DC voltage exceeds 520 V, the battery can no longer be charged or dis-
charged. The voltage of 520 V is rarely exceeded during normal operation of the
inverter.
When the output power of the inverter is reduced, the operating point shifts to-
wards higher DC voltages. The following conditions during normal operation can
lead to the DC voltage of 520 V being exceeded:
-
Overdimensioning of the PV generator.
-
Feed-in limitation (e.g. zero feed-in).
-
Specifications of the grid operator (e.g. mains voltage-dependent power re-
duction).
-
Backup power mode. If the 520 V voltage is exceeded during backup power,
backup power operation may be restricted. Therefore, an open circuit voltage
of max. 520 V is recommended.
BYD Battery-
Box Premium
BYD Battery-Box Premium HVS 5.1 7.7 10.2 12.8
Number of battery modules 2 3 4 5
Fronius Primo GEN24 *
Fronius Primo GEN24 Plus
Battery parallel operation**
BYD Battery-Box Premium HVM 8.3 11.0 13.8 16.6 19.3 22.1
Number of battery modules 3 4 5 6 7 8
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