Installation Manual

DC Overcurrent Protection

For safety and to comply with NEC (National Electrical Code) electrical

code regulations, you must install a DC overcurrent protection device

in the positive DC cable line to protect your DC cables. This DC

overcurrent device can be a fuse or circuit-breaker, but must be DC

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.

If using a fuse, we recommend using a

class-T type or equivalent.

This fuse type is rated for DC operation, can

handle the high short-

circuit currents, and

allows for momentary current surges from the

inverter without opening.

DC Grounding

The inverter/charger should always be connected to a permanent,

grounded wiring system.

The idea is to connect the metallic chassis

of the various enclosures together to have them at the same voltage

potential, which reduces the possibility for electric shock.

For the

majority of installations, the inverter chassis and the negative battery

conductor are connected to the system’s ground bond via a safety-

grounding conductor (bare wire or green insulated wire) at only one

point in the system. Per the NEC, the size for the grounding conductor

is usually based on the size of the overcurrent device used in the DC

system.

Refer to Table 1 to select the appropriate DC ground wire

based on the overcurrent device used for your inverter model.

2.0 Installation

Table 2, DC Wire Size For Increased Distance

Minimum recommended DC wire size (one way)

3 ft or less 3 to 5 ft 5 to 10 ft 10 to 15 ft

MM612AE #2 AWG #1 AWG #1/0 AWG #2/0 AWG

MM1512AE # 1/0 AWG #1/0 AWG #2/0 AWG #4/0 AWG

MM1524AE # 1/0 AWG #1/0 AWG #2/0 AWG #4/0 AWG