Magnum-energy MMS Series User Manual download pdf (Page 21)

Installation

Table 1, Recommended DC Wire/Overcurrent Device

Info: The term “in free air” is deﬁ ned by the NEC as not

encased in conduit or raceway.

Note¹ – Maximum Continuous Current is based on the inverter’s continuous

power rating at the lowest input voltage with an inefﬁ ciency factor.

Note² – Per the NEC, the DC grounding electrode conductor can be a #6

AWG conductor if that is the only connection to the grounding electrode and

that grounding electrode is a pipe, rod, or plate electrode.

Note³ – Wire size is based on the requirements needed to increase efﬁ ciency

and reduce stress to the inverter.

Note – The next larger standard size overcurrent device may be used if

the de-rated cable ampacity falls between the standard overcurrent devices

found in the NEC.

Inverter Model

MMS1012 MMS1012-G

Maximum Continuous

Current¹

133 amps 133 amps

DC Grounding

Electrode Wire Size²

#6 AWG

(13.3 mm²)

#6 AWG

(13.3 mm²)

Minimum DC Wire Size³

(75˚C rating in free air)

#2 AWG

(33.6 mm²)

[170 amps]

#2 AWG

(33.6 mm²)

[170 amps]

Maximum DC Fuse Size

150 amps with

time delay

150 amps with

time delay

Table 2, DC Wire Size For Increased Distance

Minimum recommended DC wire size (one way)

5 ft or less

(≤1.5 m)

5 to 10 ft

(1.5 m - 3.0 m)

10 to 15 ft

(3.0 m - 4.6 m)

MMS1012

#2 AWG

(33.6 mm²)

#2 AWG

(33.6 mm²)

#1 AWG

(42.4 mm²)

MMS1012-G

#2 AWG

(33.6 mm²)

#2 AWG

(33.6 mm²)

#1 AWG

(42.4 mm²)

rated. It must be correctly sized according to the size of DC cables

being used, which means it is required to open before the cable

reaches its maximum current carrying capability, thereby preventing

a ﬁ re.

See Table 1 to select the DC overcurrent device based on the

minimum wire size for your inverter model.

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