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SMA Solar Technology AG
Battery Management
Technical Description
SBU2200-TEN083320
127
For this reason, the Sunny Backup 2200 is equipped with automatic temperature compensation of the
charging voltage. The charging voltage is adjusted by 4 mV/°C and cell for battery types VLA and
FRLA as well as by 0 mV/°C and cell with NiCd batteries. The temperature compensation value can
be set using the "222.11 BatTmpCps" parameter.
16.4.1 Boost Charge
The boost charge enables the battery to be charged to approximately 85 % to 90 % by means of a
high charging voltage for a short period.
The boost charge is active whenever grid failures occur in relatively short succession. The battery is
recharged as quickly and efficiently as possible during the periods when the grid is available.
16.4.2 Full Charge
After a discharge of more than 30 %, the Sunny Backup 2200 automatically initiates a full charge if
more than 14 days (parameter "222.05 CycTmFul“) have passed since the previous grid failure. The
objective is to recharge the battery to a charge level of at least 95 %.
16.4.3 Equalization Charge
After a discharge of more than 30 %, the Sunny Backup 2200 automatically initiates an equalization
charge if more than 180 days (parameter "222.06 CycTmEqu") have passed since the previous grid
failure. The objective is to recharge the battery to a charge level of at least 95 % to 100 %.
During this process, the Sunny Backup 2200 performs controlled overcharging of the battery bank to
ensure that even the weaker cells are fully recharged. The equalization charge is simultaneously a
type of battery maintenance, and extends the battery service life.
Charging behavior of the Sunny Backup 2200
If a Sunny Backup system is newly installed, the Sunny Backup 2200 will initially perform
a full charge and then switch to float charge. Thus, the battery is always kept at a high
charge level of 95 % to 100 %. Only after a grid failure during which the battery is
discharged by more than 30 % is the battery recharged with one of the other charging
processes (boost charge, full charge, or equalization charge).