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GT Mode In a system with an OutBack FX Grid-Tie Series Inverter(s), HUB and MATE, the Charge
Controller will display GT Mode if and only if the inverter is in Sell mode and the Charge Controller is
in Bulk (MPPT BULK) or Float (MPPT FLOAT) cycle. This is also a good indicator for establishing proper
Grid-Tie mode communication between the FX G-Series Inverter(s) and Charge Controller. GT must be
selected in the MPPT Mode Advanced menu in order to be viewed.
High VOC This indicates the PV array’s open circuit voltage is too high for the controller to
safely operate. This should only occur with systems using 72 VDC nominal PV arrays in very cold
temperatures (below 5° F / -15° C). The controller will automatically restart operation once the PV
array’s open circuit voltage falls to a safe level (145 VDC or lower). The amount of time required before
starting operation is dependent on the module type, ambient temperature, and the amount of
sunlight directly on the PV array. Normally, the controller starts in the morning within a few minutes of
the PV array being in direct sunlight.
Low Light / Snoozing During the initial tracking (see Wakeup and Tracking), if it is determined to
be too late (or too early) in the day, the Charge Controller will display Low Light for a few seconds and
then display Snoozing for 5 minutes (default). This reduces energy usage and unnecessary powering of
the Charge Controller. This message is also displayed in extremely cloudy weather.
MPPT Bulk The Charge Controller is in Maximum Power Point Tracking mode trying to regulate the
battery voltage towards the Absorb voltage set point. If the Charge Controller transitioned from
Absorbing to MPPT Bulk, the Charge Timer (ChgT) counter may start counting down towards zero
minutes or until the Absorb target is met. See page 49 for more information.
MPPT Float The Charge Controller is in Maximum Power Point Tracking mode trying to regulate the
battery voltage towards the Float voltage set point. Note: Charge Timer (ChgT) is inactive in the Float
state.
New VOC The Charge Controller is acquiring a new open circuit panel voltage (VOC).
OvrCurrent If more than 6A owing from the battery or more than 100A owing to the battery. To reinitiate
power production, press ”RSTRT” in the “Misc” menu.
Over Temp (Very rare) Either the Charge Controller is too hot or its internal temperature sensor is shorted.
If this message appears, carefully check if the Charge Controller’s heat sink is extremely hot. The heat
generated by the Charge Controller, and therefore its losses, is proportional to input voltage times output
current. To help control its operating temperature, avoid installing the Charge Controller in direct sunlight
Re-Cal There are certain abnormal conditions that can confuse the current measuring method in the
Charge Controller. When and if one happens, the Charge Controller will temporarily stop and re-calibrate.
This may happen because of negative current, i.e., current owing from the battery, or a tripped PV breaker.
A new VOC is also acquired during a Re-Cal.
MPPT EQ The equalization cycle has started and the Charge Controller is trying to regulate at the
Equalization voltage set point. EQ is not battery temperature compensated. During an equalization
cycle, EQ 0:00 will be displayed along with the EQ time in hours and minutes. The AC/DC loads should
be turned o /minimized and the battery charged so the Charge Controller can quickly reach the EQ
voltage set point. Otherwise, the Charge Controller may not reach or maintain the EQ cycle.
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