Outback Power Systems MX60 User Manual download pdf (Page 9)

OutBack Power Systems Inc.

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 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  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.

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Outback Power Systems MX60 User Manual Page 9