Operation
900-0145-01-00 Rev A
21
Figure 3 Charging Stages Over Time
Figure 4 Charging Stages Over Time (Generator mode)
Time
No
Charge
Bulk
Absorption
Float
Absorption Set Point
Float Set Point
Voltage
No Charge
Bulk
Absorption
Offset
Silent
Float Timer
Silent
Float
Offset
Absorption Set Point
Sell Set Point
Float Set Point
Re-Float Set Point
Voltage
Time
No
Charge
For multiple inverters only:
The charging of multiple stacked inverters is synchronized and is governed by the master. When the
master inverter reaches the end of Absorption (and other stages), the slaves will exit Absorption as
well, even if their timers have not expired. The remaining time for the slaves will be retained in the
timer for each inverter.
The Absorption timer does not reset to zero when AC power is disconnected or reconnected. It only
resets to zero if it runs out, or if an external STOP BULK command is sent. The rest of the time, it retains
any remaining time. It adds more time to the Absorption period whenever the batteries fall below a
certain voltage. (See page 23 for more information on how the timer works.)
Offset
This is not a charging stage. The Offset function is designed to use excess battery energy to power the
loads, even when an AC source is present. Offset can operate in any stage of charging, but is shown in
Figure 3 to display the function when no charging stages or timers are active. This function is
described more fully on page 19.
Offset is a constant-voltage mode of operation. The inverter cannot import current to charge the
batteries to a target voltage, but it can export any excess current to constantly hold them at this value.
The target voltage used when no other stages are active, as shown in Figure 3, is the
Sell Voltage
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