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GT Mode In a system with an OutBack FX Grid-Tie Series Inverter(s), HUB and MATE, the FLEXmax
80 will display GT Mode if and only if the inverter is in Sell mode and the FLEXmax 80 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 FLEXmax 80. 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 FLEXmax 80 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
FLEXmax 80. This message is also displayed in extremely cloudy weather.
MPPT Bulk The FLEXmax 80 is in Maximum Power Point Tracking mode trying to regulate the battery
voltage towards the Absorb voltage set point. If the FLEXmax 80 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 47 for more information.
MPPT Float The FLEXmax 80 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 FLEXmax 80 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 FLEXmax 80 is too hot or its internal temperature sensor is shorted. If this
message appears, carefully check if the FLEXmax 80’s heat sink is extremely hot. The heat generated by the
FLEXmax 80, and therefore its losses, is proportional to input voltage times output current. To help control
its operating temperature, avoid installing the FLEXmax 80 in direct sunlight
Re-Cal There are certain abnormal conditions that can confuse the current measuring method in the
FLEXmax 80. When and if one happens, the FLEXmax 80 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 FLEXmax 80 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 FLEXmax 80 can quickly reach the EQ voltage
set point. Otherwise, the FLEXmax 80 may not reach or maintain the EQ cycle.