10
2. Determining Wire Sizes
Open Circuit Voltage/Wire and Disconnect Size
Maximum Open Circuit Voltage (VOC)
• VOC is the unloaded voltage generated by the solar array.
• Greater than 145VDC
Charge Controller suspends operation to protect components
• 150DC max open circuit voltage with the coldest environment
NOTE: Although the Charge Controller shuts down at a voltage greater than 145VDC, it can withstand
up to 150VDC from the array; anything higher than 150VDC will damage the Charge Controller).
• As every brand of panel is di erent, be sure to know the manufacturer’s speci cations.
• Weather conditions vary and will a ect panel voltage.
• Hot weather: lower open circuit voltage/lower maximum power point voltage
• Cold weather: higher open circuit voltage/higher maximum power point voltage
• Allow for ambient temperature correction using the following table:
25° to 10° C (77° to 50° F) multiply VOC by 1.06
9° to 0° C (49° to 32° F) multiply VOC by 1.10
-1° to -10° C (31° to 14° F) multiply VOC by 1.13
-11° to -20° C (13° to -4° F) multiply VOC by 1.17
-21° to -40° C (-5° to -40° F) multiply VOC by 1.25
• Check the PV array voltage before connecting it to the Charge Controller (see page 76)
Wire and Disconnect Sizing
FLEXmax 80
• The output current limit of the FLEXmax 80 is 80 amps
• Use a minimum of 4 AWG (21.15 mm
2
) wire for the output between the FLEXmax 80 and the battery
bus bar conductors
• Install OutBack OBB-80-150VDC-PNL breakers for disconnect and overcurrent protection
• The largest PV array that can connect to a Charge Controller must have a rated short-circuit current
of 64 amps or less under STC (Standard Test Conditions).
FLEXmax 60
• The output current limit of the FLEXmax 60 is 60 amps
• Use a minimum of 6 AWG (13.3 mm
2)
wire for the output between the FLEXmax 60 and the battery
bus bar conductors
• Install OutBack OBB-60-150VDC-PNL or OBB-80-150VDC-PNL breakers for disconnect and overcur-
rent protection
• The largest PV array that can connect to a Charge Controller must have a rated short-circuit current
of 48 amps or less under STC (Standard Test Conditions).
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