SMA SI 3324 Installation - Manual (Page 102)

Battery Management SMA Technologie AG
Page 102 SI3324/4248-14:SE2406 Installation Guide
11.1 Charge Control
The Sunny Island 3324/4248 has a 3-level charge control using the IV
0
V process.
The I stands for the bulk phase. At this level, the charging is only limited by the
defined maximum battery current ("23-4 AmpdcBatMax" parameter) or by the
maximum generator current ("24-2 AmpacGenMax" parameter). During this phase
the battery voltage increases as the batteries are charged.
Once the battery voltage has reached the value defined for the second phase V
0
(parameters "23-7 VchargeBoost" or "23-9 VchargeEqual" or "23-11 VchargeFull"),
then the constant voltage charging (absorption phase) begins. At this level, the
battery voltage is maintained at a constant level, resulting in a continually decreasing
battery current. The Sunny Island 3324/4248 remains in this phase for the period of
time defined for this phase (parameters "23-6 TabsorbBoost" or "23-8 TabsorbEqual"
or "23-10 TabsorbFull").
Once this phase is finished, the Sunny Island 3324/4248 enters the float charge that
again provides constant current charging but at a greatly reduced charging voltage
("24-12 VchargeFloat" parameter). If charging is done from a generator, then this is
stopped on entry to this phase, thus ending charging of the batteries at this point. The