Sunny Island
Installation & Operating Instructions
BWRI33-12:EE
- 111 -
SMA Regelsysteme GmbH
11.1 Charging Methods
The battery is charged in a charging procedure adjusted to the type of battery (gel,
fleece or lead-acid battery). The Sunny Island is informed of the battery type via the
parameter “502_Bat Type“ – e. g. in the menu “PARBAT“ (3+5). If you have installed
a non VARLA battery with electrolyte circulation, please set the battery type to gel
battery as the charging voltages and times are more suitable for this type. The final
charge voltage of the battery is adjusted to the respective battery temperature, which
in turn has been determined via a battery temperature sensor. Above 20 °C the ref-
erence value for the final charge voltage is therefore decreased by 4 mV/K (visible in
the menu “PARBAT“ (3+5)). Below 20 °C the value is increased accordingly.
The Sunny Island is capable of running four different charging methods. The different
voltages values and charging times of those methods are adjusted with temperature
compensation to the respective battery type that has been set via parameters or
adaptively determined. The charging methods have been designated as follows:
•
Normal charge (as often as possible)
•
Full charge (at least once a month if possible)
•
Equalizing charge (every two to three months)
•
Float charge (after one of the other charging procedures has been completed)
Charging is initiated by the battery management, i. e. requested from the system
management when certain battery states have been reached.
