10 | Product Function
1.5 Soft Start Charging Process
SOFT-START
When the Charger is turned on, it will start ramping current from 0 A up to the full rated
current, this is called Soft-Start and usually takes around 30 seconds. Once the full rated
current is reached the charger will move into Boost stage. The soft start charging process
only applies to the BCDC1250D.
Figure 1.5.3.1:
Soft Start Charging Process for BCDC1250D
Voltage
Float
Absorption
Boost
Soft-Start
Current
1.6 Turn On/Off Thresholds
Table 1.6.1:
Turn On/Off Thresholds
Input
12 V Vehicle Input 24 V Vehicle Input
Solar
Input Trigger Settings
Standard
Low
Voltage Standard
Low
Voltage
N/A
Input Open
Circuit Low
voltage
conditions
*1
Turn ON ABOVE
12.9 V
12.0 V
25.8 V
24.0 V
9.0 V
Turn OFF BELOW
12.7 V
11.9 V
25.4 V
23.8 V
9.0 V
Input Loaded
Low voltage
conditions
*2
Stop Charging BELOW
12.2 V
11.3 V
24.4 V
22.6 V
N/A
Turn OFF instantly BELOW
8.0 V
8.0 V
9.0 V
Turn OFF after 20 s BELOW
9.0 V
9.0 V
N/A
Input
Overvoltage
shutdown
Turn ON BELOW
15.5 V
32.0 V
32.0 V
Turn OFF instantly ABOVE
16.0 V
32.5 V
33.0 V
Turn OFF after 20 s ABOVE
15.6 V
32.1 V
N/A
Output
Undervoltage
shutdown
*1
Shutdown if Output Battery < 0 V
*1Tested every 100 seconds | *2 Tested constantly
There is a maximum 20 second delay before the charger will produce an output any time a source is introduced
into the system, this allows the unit to provide optimum input sharing and effective battery isolation.
