9
8 STAGE CHARGING MODE
1. Stage 1 - Battery Check: Pre-charge 5 sec, switches into Stage 2 (12V).
2. Stage 2 - Soft Start: Less than 2A or 10 sec charging, switches into Stage 3.
3. Stage 3 - Constant Current Charging (Bulk Charge): Max 20A, switches to
Stage 4 when the battery voltage charges to 14.5V.
NOTE:
Voltage varies to maintain a constant current until 14.5V is reached.
4. Stage 4 - Constant Voltage Charging (Absorption Charge): Constant 14.5V, up to
one hour or current drops to 3A, will switch to Stage 5.
NOTE:
Current varies to maintain constant voltage until it drops below 3A.
5. Stage 5 - Analysis: If the battery voltage drops to 12V or less in one minute,
faulty battery indicator will light up with beeper. After one minute if voltage is over
12.6V the Thunder DC-DC goes to Stage 6.
NOTE:
If battery is determined to be faulty the Thunder DC-DC will stop charging.
6. Stage 6 - Boost Stage: Voltage up to max of 15.2V (dependant on battery
chemistry), or up to one hour (up to 20A). If the current drops to less than 4A
then it will switch to Stage 7.
NOTE:
Battery chemistry is determined during charging stages, using algorithms that differentiate
the rate of charge specific to a particular chemistry e.g. AGM, Calcium, flooded etc.
7. Stage 7 - Final Charge / Test: Highest voltage 13.8V, when the current is less than
1A or one hour has passed, it will switch into Stage 8.
8. Stage 8 - Maintenance Charge (Float): Constant 13.8V pulse charging.
Pulse Check: Every 20 sec to monitor discharge (if discharge is found on the
auxiliary battery it will move back to Stage 3, and work its way back through
the stages).
Charging
Voltage
Stage
Charging
Amperage
