Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 30 -
SMA Regelsysteme GmbH
2.2.4 Failure of Individual Cells
If individual cells of the battery fail towards the end of the battery’s expected service
life, it may be more useful to remove them completely instead of replacing them.
Otherwise, the remaining service life of the other cells may be decreased. Any re-
moval of cells, however, must always be advised to the battery management of the
Sunny Island by changing the parameter “503_Ubat nom“ in the menu “PARBAT“
(3+5) accordingly. Of course, in systems with a nominal battery voltage of 48 V this
removal of single cells is not possible as 48 V are already the least possible value for
the Sunny Island.
The failure of individual cells should always be taken as a clear signal that the whole
battery will fail within a short period of time. When installing a new battery via “New
Battery“ in the “INIT“ (0-0) menu make sure to properly reset “503_Ubat nom“ to the
correct value.