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15
Appendix 1. Battery charging stages
(when the mains battery charger is On)
Depending on your inverter model, it would have been supplied with 35A, 70A or 90A mains
battery charger. This is the absolute maximum charging current
– it is possible to reduce it in the inverter
settings (see Setting section of the manual) to a lower value which will be the
operating charging current
(A).
Lower current is necessary for some battery types which can be damaged by fast charging.
The chart below shows 4 different charging stages for your battery bank, with the red graph
showing voltage (left axis) and the blue graph showing current (100% represents the
operating charging
current
value). Please note that the voltage scale is provided for illustration purposes only
– the actual
battery charging voltage might be different depending on the inverter type (12V / 24V / 48V) and the
selected battery type.
15
14.5
14
13.5
13
12.5
12
11.5
11
10.5
100
50
0
Time
Charging Voltage
Charging Current %
1
3
2
4
2. Absorption stage at 14.4V to 14.8V.
1. Constant current stage.
3. Constant voltage stage.
4. Low voltage step to stage 1.
1. Boost Constant Current (CC) Stage: if AC input is applied then the charger will run at full
operating charging current
in constant current (CC) mode until the charger reaches the boost
voltage.
The software timer will measure the time from the start, until the battery charger reaches 0.3V
below the boost voltage, it then takes this time as T0 and T0+10=T1
2. Boost Constant Voltage (CV) Stage: starts the T1 Timer; the charger will keep the boost voltage
in boost constant voltage (CV) mode until the T1 Timer has run out, then drop the voltage down
to the float voltage. The timer has a minimum time of 1 hour and a maximum time of 12 hours.
3. Float Stage: when in the float mode the voltage will stay at the float voltage set point.
4.
If the AC is reconnected or the battery voltage drops below 12V DC, the charger will reset the
cycle above. If the charger remains in the float stage for 10 days, the charger will reset the cycle.
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