Installation Manual

Neutral to Safety Ground Bonding

The NEC (National Electric Code) provides the standards for safely

wiring AE (house, cabin, or ofﬁ ce) installations in the United States.

These wiring standards require the AC source (inverter, utility power,

or a generator) to have the neutral conductor tied to ground. These

standards also require that the AC neutral be connected to safety

ground (often called a “bond”) in only one place at any time.

If more

than one bond is established, currents can circulate between neutral

and ground and cause ground-loop currents. These “ground-loops”

can trip GFCIs and cause an electric shock hazard. In AE installations,

the neutrals are connected together and are always connected to

safety ground at the main AC panel – never at the inverter.

Info: For an AE application, you must use an MM-AE

Series inverter/charger. Non “AE” versions are designed

for use in mobile applications.

AC Wiring

This section describes the required AC wire size and the overcurrent

protection needed. It also provides information on how to make the

AC connections.

WARNING: All wiring should be done by a qualiﬁ ed

person or a licensed electrician following all local/NEC

codes.

2.0 Installation

Connect a short wire (same rating as the DC wires) to one end of the

fuse block and the other end of the short wire to the positive terminal

of the last battery string (see Figure 16). This is essential to ensure

even charging and discharging across the entire battery bank.

Ensure the DC wire connections (to batteries, inverter, and fuse lugs/

DC circuit breaker) are ﬂ ush on the surface of the DC terminals, and

the hardware (lock washer and nut) used to hold these connections

are stacked correctly (see Figures 9 and 10).

Verify all DC connections are torqued from 10 to 12 foot-pounds.

Once the DC connections are completely wired and tested, coat the

terminals with an approved anti-oxidizing spray.

Press the red and black terminal covers onto the inverter’s DC con-

nectors to secure them in place.

If batteries are in an enclosure, perform a ﬁ nal check of the hold

down brackets and all connections. Close and secure the battery

enclosure.