Outback Power Systems MX60 User Manual download pdf (Page 78)

OutBack Power Systems Inc.

TYPICAL ARRAY SIZING GUIDE

Below is a list of recommended array sizing for the MX60 for various nominal voltage batteries:

Nominal Battery Voltage Recommended Array Size

(in watts, Standard Test Conditions)

12 V 800 W

24 V 1600 W

36 V 2400 W

48 V 3200 W

60 V 4000 W

The MX60 PV MPPT Charge Controller is capable of an input open circuit voltage (Voc) of up to150

VDC. Cooler climates can cause the Voc to rise above the panel Voc rating. In climates that observe

temperatures less than approximately 5° F, a Voc greater than 125 VDC is not recommended.

When sizing an array, it is recommended that the nominal array voltage be higher than the nomi-

nal battery voltage. Below is a list of recommended nominal array sizing:

Nominal Battery Voltage Nominal Array Voltage (recommended)

12 V 24 V (or higher)*

24 V 36 V (or higher)*

36 V 48 V (or higher)*

48 V 60 V (or higher)*

60 V 60 V (low temp is less than 5° F) or

72v (low temp is greater than 5° F)

* When sizing an array to charge controller with a distance of 70 feet or greater, OutBack

recommends the nominal array voltage be slightly higher than the recommended nominal

array voltage. Example: A 36 VDC nominal array recharging a 12 V nominal battery with an array to

charge controller distance of about 70 feet or greater. Sizing the nominal array voltage higher than

the nominal battery voltage ensures that the Maximum Power Point is always above the battery

voltage. The Maximum Power Point will decrease as the panels warm up, thus lowering the output

of the array. The MX60 Charge Controller will not be able to boost the output if the Maximum

Power Point of the array is at or lower than the battery voltage.

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Outback Power Systems MX60 User Manual Page 78