Installing The Charge Controller On Flexware Enclosures; Open Circuit Voltage/Wire And Disconnect Sizing - Outback Power Systems FlexMax 60 User Manual

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
• 150DC
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 diff erent, be sure to know the manufacturer's specifi cations.
• Weather conditions vary and will aff 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)
9° to 0° C (49° to 32° F)
-1° to -10° C (31° to 14° F)
-11° to -20° C (13° to -4° F)
-21° to -40° C (-5° to -40° F)
• 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
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
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).
10
Charge Controller suspends operation to protect components
max open circuit voltage with the coldest environment
2
) wire for the output between the FLEXmax 80 and the battery
2) wire for the output between the FLEXmax 60 and the battery
multiply VOC by 1.06
multiply VOC by 1.10
multiply VOC by 1.13
multiply VOC by 1.17
multiply VOC by 1.25