ROGUE MPT-3024, Installation Manual And Owner'S Manual, Page: 16 / 52

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fully charged. As the charger operates in this mode, battery voltage will
gradually rise until it equals the absorb setpoint, at which point the batteries
are typically within 25% or less of being fully charged. PV voltage will be
maintained at its V
mp
during this mode.
2) ABSORB: The controller will transition to this mode from the MPPT mode
when the battery voltage equals the absorb setpoint. The batteries will then be
charged at this constant voltage and a timer will begin counting down based on
the value of the FLOTM setpoint. The charger will remain in this mode until one
of these two conditions are met: A) The battery charging current eventually
decreases to the value defined by the FLOTR setpoint, or B) The time defined
by the FLOTM setpoint has elapsed. In general, if the charger is supplying
current to loads as well as charging batteries in this mode, the FLOTR setpoint
will never be met because the loads will almost always be demanding a current
greater than that of the FLOTR setpoint. The timer will instead elapse and force
a transition to the full state. If the controller cannot maintain the battery voltage
within 0.2 volts of the absorb setpoint (because of insufficient current from the
PV array and/or excessive loads), it will revert back to the MPPT mode and will
once more begin charging up to the absorb setpoint. The absorb timer will be
reset and will begin counting down again when the controller next enters the
absorb mode. This transition between MPPT and ABSORB modes may occur
back and forth a number of times when the battery voltage is near the absorb
setpoint on partly cloudy days. The absorb mode may be disabled by setting
the FLOTM setpoint to its minimum value of zero minutes. If absorb is disabled,
the controller will transition immediately to full upon reaching the absorb
setpoint voltage, and will remain in this mode indefinitely unless triggered back
into the MPPT mode, as described above. Note that if both the absorb mode
and the float mode have been disabled, the charger will remain in the absorb
mode indefinitely. The absorb mode will be re-enabled (FLOTM will be reset to
its default of 180 minutes or 3 hours) if power is disconnected from the
MPT-3024 while absorb is disabled.
3) FULL: In this mode, the charger has been turned off so that no power is
being supplied to the batteries. The controller will transition to this mode upon
completion of the ABSORB mode, or any time the battery charging current
drops to zero while the controller is in float mode (as may happen if the float
setpoint is lowered while the controller is in float mode). It will remain in this
mode until the battery voltage drops to about 0.05 volt below the value defined
by the float setpoint and the batteries begin drawing current.