SMA SI 3324 Installation - Manual (Page 109)

SMA Technologie AG Battery Management
Installation Guide SI3324/4248-14:SE2406 Page 109
The height of the three characteristic curves can be easily set using the parameters
"24-15 SocLim1", "24-16 SocLim2" and "24-17 SocLim3". The charge level values set
here are automatically converted into characteristic curves.
The conversion is done using the following formula:
V
0
= 1.96 + 0.16 * SocLim
V
0
: Single cell open-circuit voltage (battery current = 0)
Since different types of battery also have slightly different current-voltage
characteristic curves, the state of charge (SOC) values set here may differ by up to
10 % from a state of charge (SOC) measured using ampere-hour balancing.
To achieve a sensible assignment of the state of charge (SOC) limits, the Sunny Island
3324/4248 firmware assigns your entered values in the following manner:
• Highest value = SocLim1
• Lowest value = SocLim3
• Any other value = SocLim2
11.4 Exchanging the Batteries
If you wish to exchange your batteries with new batteries, then the parameters
• "23-2 BatType"
• "23-3 AmpHoursBat"
• "23-4 AmpdcBatMax"
• "23-5 NewBattery"
must be reset to new values, with the inverter in standby mode. Proceed as follows:
1. Set parameter 23-5 to "Reset"
2. The Sunny Island 3324/4248 restarts
3. The message "To init system press "
is displayed.
4. Press .
If you enter 30 % for SocLim2 and 50 % for SocLim3, the Sunny Island 3324/
4248 firmware automatically corrects this and exchanges the values.
To init system
press