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Viewing Operating Status
975-0400-01-01
4–5
Charge Stages
The charge stages displayed on the LCD are described in Table 4-4.
Table 4-4
Charge Stages
Text
Description
Bulk
Batteries are charging at the maximum current output of the DC source.
If the Charge Controller shuts down because of low input voltage, the unit
restarts in bulk mode. This means the Charge Controller starts in bulk at
the beginning of every day, regardless of the present battery voltage. If the
batteries are charged already, the bulk/absorption cycle finishes after a
short period and the unit transitions to float/no float (depending on Charge
Cycle configuration).
Absorb
After transitioning from bulk mode, the XW SCC holds the battery voltage
at the absorption voltage setting and the current gradually declines as the
battery capacity is reached. The XW SCC stops absorption charging when
three conditions are met, as described in “Absorption Stage” on page 1–5.
Float
Battery voltage is held at the float voltage setting. When the battery
voltage drops below the ReCharge Volts setting for a cumulative period of
1 minute, a new bulk cycle will be triggered.
No Float
The charger does not output any power during this stage. When the battery
voltage drops below the ReCharge Volts setting for a cumulative period of
1 minute, a new bulk cycle is triggered.
Equalize
A deliberate overcharge designed to return each battery cell to optimum
condition by reducing sulfation and stratification in the battery. An
equalization charge lasts one hour.
During the Equalize stage, this screen becomes the top-level screen. The
screen displays the equalization time remaining in minutes and seconds.
ChgrOff
No charging is occurring because the input power from the PV array has
fallen below the battery voltage.
Summary of Contents for XW-MPPT60-150
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Page 3: ...XW Solar Charge Controller Owner s Guide ...
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