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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 diff erent, be sure to know the manufacturer's specifi cations.
• Local temperatures vary seasonally and will aff 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)
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 MX60.
Wire and Disconnect Sizing
• The output current limit of the MX60 is 60 amps.
• Use a minimum of 6 AWG wire for the output between the MX60 and the batterry bus bar con-
ductors; a larger size might be required due to temperature and/or conduit fi ll corrections.
• Install OutBack OBDC-60 or OBDC-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 OBDC 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 80-82 for
other suitable conductor/wire sizing.
OutBack Power Systems Inc.
multiply by 1.06
multiply by 1.10
multiply by 1.13
multiply by 1.17
multiply by 1.25
9
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