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Operation
900-0020-01-00 Rev A 21
Figure 3 Charging Stages Over Time
1
Figure 4 Charging Stages Over Time
1
(Generator mode)
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
setting. (Excess current typically comes into the batteries from a PV array, wind turbine, or similar
renewable energy source.)
Target point:
Sell Voltage
setting. The default setting is 52.0 Vdc.
1
The points where the dark blue line intersects the vertical dotted line indicate a change from one step to the next. The
points where they also intersect with a horizontal dotted line indicate that the charger has switched to a new target voltage.
No
Charge
Bul
k
Absorption
Float
Absor
p
tion Set Point
Float Set Point
Voltage
No Charge
Time
No
Charge
Bul
k
Absorption
Offset
Silent
Float Timer
Silent
Float
Offset
Absor
p
tion Set Point
Sell Set Point
Float Set Point
Re-Float Set Point
Voltage
Time