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10.2Battery specifications
STM 8.. devices are intended for charging the following batteries at any state of
charge:
• Open and sealed lead-acid batteries
• Leaded lead-acid batteries (gel batteries, absorbed glass mat batteries)
• Capacities from 20 Ah to 600 Ah
10.3Applicable standards
See declaration of conformity in appendix.
10.4Characteristic curves
10.4.1IU characteristic curve
IU - characteristic curve (UoIUoIU)
Battery capacity
100%
90%
Charge (I)
Pre-charging (U)
(totally dicharged battery)
empty
Trickle (IU)
Recharge (U)
Charging voltage
14.4 V
Charge
optimisation
13.8 V
≈
100 %
Charging current
Charging time≈Capacity (Ah)
Charging current (A)
Other loads
Time
Start
IU characteristic curve for the 12 V variant with factory settings
1. Pre-charging with end-of-charge voltage (only with totally discharged batteries)
2. Charging with constant charging current, charging voltage increases
3. Recharging with end-of-charge voltage, charging current decreases
4. Trickle charging
10.4.2IA characteristic curve
IA - characteristic curve (UoIUoIU)
100%
90%
Battery capacity
Pre-charging
16 V
14.4 V
13.8 V
100%
Main charging
Recharge
IA phase
Trickle
Charging coltage
Charging current
10%
IA characteristic curve for the 12 V variant with factory settings
1. Pre-charging with end-of-charge voltage (only with totally discharged batteries)
2. Charging with constant charging current, charging voltage increases
3. Recharging with end-of-charge voltage, charging current decreases
4.IA phase with 10% of the end-of-charge current and unlimited charging voltage
5. Trickle charging
The IA phase prevents or reverses sulphation of the battery.
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