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OPEN CIRCUIT VOLTAGE/WIRE AND DISCONNECT SIZING
Maximum Open Circuit Voltage (Voc)
• Voc is the unloaded voltage generated by the solar array.
141 VDC MX60 suspends operation to protect components
150 VDC max open circuit voltage with the coldest environment (although the MX60 shuts
down at 141 VDC, it can absorb up to 150 VDC from the array; anything higher than 150 VDC
will damage the MX60)
• As every brand of panel is di erent, be sure to know the manufacturer’s speci cations.
• Local temperatures vary seasonally and will a ect panel voltage.
Hot weather: lower open circuit voltage/lower maximum power point voltage
Cold weather: higher open circuit voltage/higher power point voltage
Allow for ambient temperature correction using the following table:
25° to 10° C (77° to 50° F) multiply by 1.06
9° to 0° C (49° to 32° F) multiply by 1.10
-1° to -10° C (31° to 14° F) multiply by 1.13
-11° to -20° C (13° to -4° F) multiply by 1.17
-21° to -40° C (-5° to -40° F) multiply by 1.25
Check the PV array voltage before connecting it to the MX60.
Wire and Disconnect Sizing
• The output current limit of the MX60 is 60 amps.
• Use a minimum of 6 AWG (4.11 mm) wire for the output between the MX60 and the battery bus
bar conductors; a larger size might be required due to temperature and/or conduit ll corrections.
• Install OutBack OBB-60 or OBB-80 amp breakers for disconnect and over current protection.
• The largest PV array that can connect to an MX60 should have a rated short-circuit current of 48
amps STC (Standard Test Conditions).
• Input conductors and circuit breakers must be rated at 1.56 times the short-circuit current of the PV
array. OutBack OBB 100% duty continuous breakers only need to be rated at 1.25 times the short-
circuit current.
• Please see the wire Distance Chart and complete Wire and Disconnect Sizing on pages 81-83 for
other suitable conductor/wire sizing.