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• Are the batteries charged? Is the FLEXmax 80 in the Absorbing or Float stage? If either case is

true, the FLEXmax 80 will produce enough power to regulate the voltage at the

ABSORB or

FLOAT set point voltage, therefore, requiring less power in these modes.

• What is the short circuit current of the PV array? Use a multi-meter to determine if a short circuit

current is as expected. There might be a loose PV array connection.

• If the PV array voltage close to the battery voltage, the panels could be warm/hot causing the

Maximum Power Point to be at or lower than the battery voltage.

• Is it in U-Pick mode?

FLEXmax 80 is not equalizing

• Has the EQ cycle been initiated?

• In the EQ Menu, press START to begin process. When the EQ cycle has been initiated,

EQ-MPPT will be displayed.

• The EQ cycle has been initiated, but the battery is not equalizing.

• The

EQ cycle will begin when the target EQ set point voltage has been reached. A small

array or cloudy weather will delay the

EQ cycle. Accordingly, running too many AC and/or

DC loads will delay the

EQ cycle, too.

• An EQ set point that is too high relative to the battery voltage will delay the

EQ cycle.

• If the PV array voltage is close to the battery voltage, the panels could be warm/hot causing the

Maximum Power Point to be at or lower than the battery voltage which can delay the

EQ cycle.

FLEXmax 80 Battery Temperature Compensated Voltage

• Only the OutBack RTS (remote temperature sensor) can be used with the FLEXmax 80.

• The battery voltage can rise above the

ABSORBING and FLOAT voltage set points if the battery

temperature is < 77°F or fall below the ABSORBING and FLOAT voltage if the battery temperature

is > 77°F.

• Why does the FLEXmax 80 show

BatTmpErr on the STATUS screen?

• The RTS is faulty or damaged. Disconnect the RTS from the RTS jack to resume

normal operation.

Outback Power Systems FLEXMAX 80 User Manual

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