Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 29 -
SMA Regelsysteme GmbH
2.2.3 Low Battery Load Mode
In order to prevent the lead storage battery from getting totally exhausted, the Sunny
Island provides three steps of power saving:
Step 1
If the battery state reaches the value defined by parameter “535_State StopT” (de-
fault setting: L2) the Sunny Island switches to standby mode in a certain period of
time (e. g. during the night) but will still be fully active during the rest of the day. This
special time period can be defined with parameters “533_Stdby t beg” and
“534_Stdby t end” (cf. Fig. 8.14 in Chapter 8.7).
Step 2
In all battery states below the one defined by parameter “535_State StopT” the
Sunny Island will be in standby mode day and night, but will run in intervals of four
hours for five minutes during daytime in order to allow AC-sources to feed their en-
ergy into the grid.
Step 3
If the battery state drops to L4 the Sunny Island will be in standby mode day and
night, and will only be activated for five minutes when started manually.