BÜTTNER ELEKTRONIK – Batt erie-Control-Booster MT BCB 30/30, MT BCB 40/40, MT BCB 60/40
28
4.8.2. LiFePO
4
-batt eries:
For LiFePO
4
-batteries, the charging volta-
ge is not continuously adjusted to the tem-
perature. Only at extreme battery tem-pe-
ratures e.g. < -20°C, > 50°C the charging
voltage is reduced to approx. 12.80 V to
protect the battery (LED Batt. I flashes)
Battery charging will then no longer take
place, but any connected consumers will
continue to be supplied by the charger
until the battery is within the permissib-
le temperature range and charging auto-
matically can be continued.
Below 0°C the charging current is signifi-
cantly reduced to protect the battery and
longer charging times can be expected.
(LED Batt. I is extincted briefly every 2 s)
Note:
Without temperature sensor no device function,
LED Main Charging flashes!
Charge program LiFePO
4
13.9 V
Charging voltage (V)
U1, U2
U3
Battery temperature (°C)
charging
20–00° ° CC
Current 0 – 100%
reduced
current
Charging / buffer / load
Charge program LiFePO
4
14.2 V
Charging voltage (V)
Current 0 – 100%
Charging / buffer / load
U1
U2
U3
Battery temperature (°C)
charging
20–00° ° CC
reduced
current
IU
1
oU
2
oU
3
-presentati on of the temperature-compensated
charging program for LiFePO
4
-batt eries
Charge program LiFePO
4
14.4 V
Charging voltage (V)
Battery temperature (°C)
Charge program LiFePO
4
14.6 V
Charging voltage (V)
Current 0 – 100%
Charging / buffer / load
U1
U2
U3
Battery temperature (°C)
charging
20–00° ° CC
reduced
current