©
2012 Magnum Energy, Inc.
Page 24
Installation
2.9 AC
Wiring
This section provides information on the AC wiring inside the MMP enclosure to/from the inverter,
from the incoming AC source, and to the outgoing AC distribution panel (i.e., inverter sub-panel).
2.9.1
AC Wiring Guidelines
CAUTION:
Before installing any AC wiring, review the safety information at the
beginning of this manual and below to ensure a safe and long-lived system:
• Read all instructions and cautionary markings located at the beginning of this
manual and in the Installation section, before installing the inverter and batteries.
• AC wiring must be no less than #10 AWG (5.3 mm
2
) gauge copper wire and be
approved for residential wiring.
• DO NOT connect the Magnum inverter’s output to an AC power source. This could
cause severe damage to the inverter and is not covered under warranty.
WARNING:
To reduce the risk of
fi
re, do not connect a 120 VAC only inverter to both
busbars in an AC load center (circuit breaker panel) having multi-wire branch circuits
connected. Every circuit connected to a 120 VAC panel must have its own neutral;
otherwise, currents on shared neutrals will add rather than subtract, overloading the
neutral conductor.
2.9.2 AC
Connections
Use either Figure 2-10 (for MMPxxx-30D models) or Figure 2-11 (for MMPxxx-60S models) to view
the AC connection points inside the MMP enclosure.
2.9.2.1
AC Input/Output Connections
The MMP enclosure provides two AC terminal blocks that allow the AC input and output wiring to
be easily and permanently wired. These terminal blocks allow a service/distribution panel (main
panel) to be wired to the inverter’s input, and a dedicated inverter panel (sub-panel)
1
to be wired
between the inverter’s output wiring and the AC loads.
Depending on your MMP model, it will either have two six-pole AC terminals (Figure 1-2, Items
4 and 6), or two four-pole AC terminals (Figure 1-4, Items 4 and 6). The six-pole terminals are
provided on the MMPxxx-30D models to allow 120/240 VAC inverters—up to 30 AC amps per leg
pass-thru capability—to be connected. The four-pole terminals are provided on the MMPxxx-60S
models to allow 120 VAC inverters—up to 60 AC amps pass-thru capability—to be connected.
The upper AC terminal block—INVERTER AC TERMINAL BLOCK—provides the connection points for
the inverter’s input and output Hot and Neutral connection points. The lower AC terminal block—
EXTERNAL AC TERMINAL BLOCK—provides the Hot and Neutral connection points for the incoming
utility/AC generator input and to the inverter AC sub-panel (if needed)
1
.
Info:
The neutrals on the INVERTER AC TERMINAL BLOCK are NOT connected together.
You must provide both an inverter input and output neutral connection to the inverter’s AC
terminal unless the inverter has the input and output neutrals connected together.
Each connection on the AC terminal block is rated to accept one #14 to #6 AWG (2.1 to 13.3 mm
2
) CU
stranded wire, or, two #12 AWG (3.3 mm
2
) CU stranded wires. Each connection uses a M3.5 slotted
screw, and the maximum tightening torque is 16 lbf-in (1.8 N-m).
2.9.2.2
AC Ground Connections
The MMP enclosure comes with a ground busbar (Item 8, in Figure 1-2 or 1-4) to allow the AC
grounds to be connected to a common point. This busbar has three #14 to #1/0 AWG and six
#14 to #6 AWG screw type compression terminals. See Table 2-1 for torque requirements.
CAUTION:
A neutral to ground connection is provided in the MMP enclosure. If this
neutral-ground connection is provided elsewhere in the AC system, this connection
must be disconnected. See Section 2.11 for information to disconnect this connection.
Note
1
– MS2012/MS2000 (-15B and -20B) breaker models do not require a dedicated inverter sub-panel.
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