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OutBack Power Systems Inc.
UNDERSTANDING THE VARIOUS OPERATIONAL MODES
The MX60 modes of operation will change occasionally during the day based on the PV array
output and the battery system state of charge. The MX60 operating modes are displayed at the
bottom right hand corner of the STATUS screen.
Absorb-EX There is an external DC source other than solar keeping the battery above the Absorb
set point. The MX60 will not be producing power.
Absorbing The MX60 is in the Absorb (constant voltage) charge stage, regulating the battery volt-
age at the Absorb set point (modi ed by battery temperature compensation if installed). During
this cycle, the ChgT counter in the Misc menu is counting down towards zero. If the system cannot
regulate the battery voltage at the Absorb voltage set point, then the MX60 reverts back to the
Bulk charge stage, display B-MPPT, and the ChgT counter will start counting up again towards the
MAX Absorb time set point or until the Absorb target is met.
AutoStart (Auto Re-Start) Mode 1—Once every 1.5 hours in Bulk cycle and in Mode 2, once every
1.5 hours in the Bulk, Absorb and Float recharging modes, the MX60 will start over from sleeping
and re-sweep (full sweep) and re-calibrate the current sensor. Mode 0 is disabled completely. It is
recommended that this mode be left to mode 2, Auto Re-Start in all 3 recharging cycles. (See Log2
screen)
Bat>Abs When the PV voltage exceeds the battery voltage by 2V and the battery voltage exceeds
the absorb set point, the MX60 has no need to recharge. This can also unintentionally occur if the
user inputs a lower battery voltage than is actually in use (e.g. establishing set points for a 12V
system when a 24V battery bank is used). In this case, the MX60 will always sense a higher (24V)
voltage than a 12V system would require for recharging.
Bat Full There is an external DC source other than solar keeping the battery above the Float set
point. The MX60 is transitioning from Absorb (upper target voltage) to Float (lower target voltage)
or it will not be producing power.
B-MPPT The MX60 is in Maximum Power Point Tracking mode trying to regulate the battery volt-
age towards the Absorb voltage set point. If the MX60 is in the Bulk charge stage, the Charge Timer
(ChgT), will count up to the max Absorb time.