Siemens SITOP PSU8600 Manual page 140

Mounting and maintenance
4.7 Replacing batteries in a battery module
SITOP BAT8600 LiFePO4 battery module
Article number: 6EP4143-8JB00-0XY0
Service life
The following table provides an overview of the expected service life of the lithium iron
phosphate battery installed in the battery module, taking into account the ambient
temperature. This service life data is applicable both for system use in standby operation - as
well as being stored as standalone unit.
When evaluating the service life of the lithium iron phosphate battery installed, also take into
account the "state of health" (SOH) parameter, which the system automatically generates
and continually updates. This takes into account the prevailing ambient temperatures during
storage and in operation - and also the loads as a result of possible load and discharge
cycles.
Proper storage
To achieve an optimum lifetime of the battery module, this should be stored for the shortest
possible time in a dry and cool environment that is frost-free.
For long-term, standalone storage it should be noted that the BAT8600 LiFePO4 battery
module is cyclically fully charged in order to avoid the discharge of the installed lithium iron
phosphate batteries. When stored at room temperature, the recommended recharge interval
is approximately every 6 months; when stored at higher ambient temperatures, the recharge
interval must be shortened to 3 months. At room temperature, the recommended charge
parameters for a full charge are:
● Charging voltage is 56 V, current limited to 2.5 A; minimum charge duration is 12 hours.
140
Temperature [°C]
-10
0
10
20
30
40
50
Service life [years]
>16
>16
16
8
4
2
1
Power supply system SITOP PSU8600
Manual, 09.2018, A5E36758446-5-76