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If a fuse is used as an overcurrent device, a Class-T type or equivalent is recommended. This
fuse type is rated for DC operation, can handle high short-circuit currents, and has a time delay
that allows for momentary current surges from the inverter without opening the fuse. However,
because the fuse can be energized from both directions, the NEC requires that it be installed in a
manner that the power must be disconnected on both ends of the fuse before servicing.
Use Table 2-1 to select the DC overcurrent device needed based on the recommended minimum
wire size for your particular inverter model (may not meet all local code or NEC requirements).
Table 2-2, DC Wire Size For Increased Distance
5 feet or less
Inverter
(1.5 m or less)
Model
In Conduit
#4/0 AWG
MS2000
(107.2 mm
#4/0 AWG
MS2012
(107.2 mm
#4/0 AWG
MS2812
(107.2 mm
#1 AWG
MS2024
(42.4 mm
#4/0 AWG
MS4024
(107.2 mm
#1 AWG
MS4048
(42.4 mm
* Copper wire rated with 90°C (194°F) insulation at an ambient temperature of 30°C (86°F).
2.4.3
DC Cable Connections
Do not put anything between the battery cable ring lug and the battery post or the fl at metal part
of the inverter's DC terminal. When connecting the battery cable to the battery post or inverter
DC terminal, the cable should be placed directly against the inverter terminal or battery post.
Incorrectly installed hardware causes a high resistance connection which could lead to poor inverter/
charger performance, and may melt the cable and terminal connections.
CAUTION: The DC terminal and Flange/Kep nuts are made of stainless steel which have
a high likelihood of seizure. To help prevent the bolt and nut from seizing—causing the
bolts to strip or snap/break-off—the use of anti-seize lubricant is highly recommended.
Info: If antioxidant grease or spray is used, apply it after all the connections have been
made and are properly tightened. A 1/2-inch wrench or socket is used to tighten the 5/16
SAE Flange/Kep nuts.
Refer to Figures 2-7 and 2-8 on the next page to connect the DC cables and to stack the hardware
correctly. Tighten the terminal connections from 10 to 12 ft lbf (13.6 to 16.3 N-m).
© 2016 Sensata Technologies
Minimum Recommended DC Wire Size (one way)*
In Free Air
In Conduit
#2/0 AWG
#4/0 AWG x2
)
(67.4 mm
)
(107.2 mm
2
2
#2/0 AWG
#4/0 AWG x2
)
(67.4 mm
)
(107.2 mm
2
2
#4/0 AWG
#4/0 AWG x2
)
(107.2 mm
)
(107.2 mm
2
2
#4 AWG
#1/0 AWG
)
(21.1 mm
)
(53.5 mm
2
2
#2/0 AWG
#4/0 AWG x2
)
(67.4 mm
)
(107.2 mm
2
2
#4 AWG
#1/0 AWG
)
(21.1 mm
)
(53.5 mm
2
2
5 to 10 feet
(1.5 m to 3.0 m)
In Free Air
#4/0 AWG
)
(107.2 mm
)
2
2
#4/0 AWG
)
(107.2 mm
)
2
2
#4/0 AWG x2
)
(107.2 mm
)
2
2
#2 AWG
)
(33.6 mm
)
2
2
#4/0 AWG
)
(107.2 mm
)
2
2
#2 AWG
)
(33.6 mm
)
2
2
Installation
10 to 15 feet
(3.0 m to 4.6 m)
In Conduit
In Free Air
not
#4/0 AWG x2
recommended
(107.2 mm
not
#4/0 AWG x2
recommended
(107.2 mm
not
not
recommended
recommended
#2/0 AWG
#1/0 AWG
(67.4 mm
)
(53.5 mm
2
not
#4/0 AWG x2
recommended
(107.2 mm
#2/0 AWG
#1/0 AWG
(67.4 mm
)
(53.5 mm
2
Page 18
)
2
)
2
)
2
)
2
)
2
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