Battery Management
SMA Solar Technology AG
128
SBU2200-TEN083320
Technical Description
16.4.4 Silent Mode
Only during operation on the public grid and at times when PV grid feeding is not possible, can the
silent mode be used alongside the float charge. Silent mode causes the system's operating
consumption to go down.
Silent mode is activated by means of the "224.01 SilentEna" parameter. The parameters "231.01
PvFeedTmStr" and "231.02 PvFeedTmStp" stipulate the times between which the PV system can feed;
i.e. silent mode is possible in the remaining time window (PvFeedTmStp -> PvFeedTmStr).
The Sunny Backup system remains in silent mode for a fixed time ("224.03 SilentTmMax" parameter)
or until the battery voltage per cell is 0.14 V lower than the set voltage ("222.10 ChrgVtgFlo"
parameter). This ensures that the battery is always fully charged, even in silent mode.
If a grid failure is detected while in silent mode, the Sunny Backup 2200 restores power supply within
approximately 6 seconds.
16.4.5 Manual Equalization Charge
An equalization charge can be manually triggered for the Sunny Backup 2200 at any time using the
"520.01 ManChrgSel" parameter. The equalization charge is activated once the manual
equalization charge has been confirmed.
16.5 Battery Preservation Mode
The Sunny Backup 2200 has a sophisticated battery preservation mode. The battery preservation
mode prevents the battery from being deeply discharged, as much as possible, when the energy
supply is low and thus prevents a total system failure as well as damage to the battery.
The battery preservation mode has three levels that are activated as a result of the state of charge
(when the charge drops below the respective limit, "223.05 BatPro1Soc", "223.06 BatPro2Soc" and
"223.07 BatPro3Soc" parameter):
System behavior in silent mode
During this period, the PV system is disconnected from the public grid, and cannot feed.
Ensure that the only period stipulated here is one in which the PV system is also unable to
generate energy (night).
NOTICE!
If not charged for long periods of time, the battery ages prematurely due to
outgassing (sulfation).
• Carry out a manual equalization charge at least once a year.
