Magnum Energy Magnum Panel (MP Series) - Manual (Page 45)

Page 38 © 2011 Magnum Energy, Inc.
3.0 Installation
3.6 AC Wiring
This section provides information on the AC wiring inside the MP enclosure. It covers all AC wiring
to/from the inverter, from the incoming external AC source, and to the outgoing external AC
distribution panel (i.e., inverter sub-panel).
3.6.1 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 Pre-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 120V AC only inverter to both
busbars in an AC load center (circuit breaker panel) having multi-wire branch circuits
connected. Every circuit connected to a 120V AC panel must have its own neutral;
otherwise, currents on shared neutrals will add rather than subtract, overloading the
neutral conductor.
3.6.2 AC Connections
To view the AC connection points inside the MP enclosure, r eview Figure 3-12 for MPSL-30D and
MPSH-30D models, Figure 3-13 for MPSL-60S models, or Figure 3-13 for MPDH-30D models.
3.6.2.1 AC Input/Output Connections
The MP enclosure provides busbars that allow the AC wiring (both inverter and external) to be
easily and permanently wired. Each busbar has dual set-screw compression terminals allowing #14
to #1/0 AWG wires using the larger set-screws and #14 to #6 AWG wires using the smaller set-
screws. These busbars use slotted head set-screws and should be torqued according to Table 3-1.
The lower section of the MP enclosure provides the external AC input and output busbars. The
external AC input busbars are labeled AC HOT 1 IN, AC HOT 2 IN, AC NEUTRAL, and GROUND.
These busbars are used to wire a service/distribution panel (AC main panel) which allows the
incoming utility/AC generator input to be connected to the inverter’s input breakers. The external
AC output busbars are labeled AC HOT 1 OUT, AC HOT 2 OUT, AC NEUTRAL, and GROUND. These
busbars allow a dedicated inverter panel (AC sub-panel) to be wired between the inverter’s output
and the AC loads.
The upper section of the MP enclosure provides the inverter’s AC output busbars. The inverter
busbars are labeled INV HOT 1 OUT, INV HOT 2 OUT, AC NEUTRAL, and GROUND. These busbars
combine all the inverter outputs together when stacked for increased power capability.
Info: The busbars labeled AC NEUTRAL in the MP enclosure ARE connected together.
You do not need to provide both an inverter input and output neutral connection when
using the Magnum MS-PAE Series inverter because the input and output neutrals are
connected together. However, using any other Magnum inverter, the input and output
neutrals are not connected, so you must connect to the inverter’s input and output
neutral terminals when wiring the neutral wires.
Info: The busbars labeled GROUND in the MP enclosure ARE connected together. You do
not need to provide both an inverter AC input and output ground connection.
CAUTION: A neutral to ground connection is provided in the MP enclosure. If a neutral
to ground connection is provided elsewhere in the AC system, the connection inside
the MP enclosure must be disconnected. See Section 3.9 for information to disconnect
this neutral to ground connection.