Magnum Energy MP Extension Box (MPX Series) User Manual

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3.0 Installation

3.2.2 Wiring the MPXS-30D

The following steps are basic guidelines for installing and connecting the AC, DC, and communica-

tion wiring for the MPXS-30D (used with MPSL-30D or MPSH-30D enclosures).

WARNING: To prevent electrical shock, make sure all AC power (inverter, generator, or

utility) is off before making any AC connections inside the MP enclosure.

MPXS-30D AC Wiring

This section provides information on the AC wiring to/from the inverters, and to/from the main panel

and sub-panel. The MPX kit includes strand B wires for wiring to the AC terminals in the MP enclo-

sure. The HOT 1 and HOT 2 wires into/out of the inverter are longer than needed. This allows you to

cut and use the two excess wire lengths (one black and one red, or one black w/stripe and one red

w/stripe) for routing AC wires from the bottom of the AC breaker to the MP’s busbar terminals. See

Table 2-1 for AC wire size, color, length, and routing location.
Inverter AC Input Wiring (see Figure 3-18a - MPSL-30D, Figure 3-19a - MPSH-30D)
1. Route and attach a black wire from the top right terminal of each of the MP enclosure’s new AC input

breakers to each inverter’s AC HOT 1 IN terminal (Master, Slave 1, and if MPSH-30D enclosure, Slave 2).

2. Route and attach a red wire from the top left terminal of each of the MP enclosure’s new AC

input breakers to each inverter’s AC HOT 2 IN terminal.

3. Route and attach a green wire from the MP enclosure’s GROUND busbar to each inverter’s AC

GROUND terminal.

Inverter AC Output Wiring (see Figure 3-18a - MPSL-30D, Figure 3-19a - MPSH-30D)
1. Route and attach a black w/white stripe wire from the MP enclosure’s INV HOT 1 OUT busbar to

each inverter’s AC HOT 1 OUT terminal (Master, Slave 1, and if MPSH-30D enclosure, Slave 2).

2. Route and attach a red w/white stripe wire from the MP enclosure’s INV HOT 2 OUT busbar to

each inverter’s AC HOT 2 OUT terminal.

3. Route a white wire from the MP enclosure’s AC NEUTRAL busbar to each inverter’s AC NEUTRAL terminal.
Bottom AC Breaker Wiring (see Figure 3-18b - MPSL-30D, Figure 3-19b - MPSH-30D)
1. Route and attach a black wire from the bottom right terminal of each of the new AC input

breakers to the MP enclosure’s AC LEG 1 IN busbar (Master, Slave 1, and if a MPSH-30D

enclosure, Slave 2).

2. Route and attach a red wire from the bottom left terminal of each of the new AC input breakers

to the MP enclosure’s AC LEG 2 IN busbar.

External AC Main Panel Wiring (see Figure 3-18b - MPSL-30D, Figure 3-19b - MPSH-30D)
1. Route and attach a black wire from MP enclosure’s AC LEG 1 IN busbar to the main AC electrical panel.
2. Route and attach a red wire from the MP enclosure’s AC LEG 2 IN busbar to the main AC electrical panel.
3. Route and attach a green wire from the MP enclosure’s GROUND busbar to the main AC electrical

panel’s Ground busbar.

4. Route and attach a white wire from the MP enclosure’s AC NEUTRAL busbar to the main AC

electrical panel’s Neutral busbar.

External AC Sub-Panel Wiring (see Figure 3-18b - MPSL-30D, Figure 3-19b - MPSH-30D)
1. Route and attach a black wire from the MP enclosure’s AC LEG 1 OUT busbar to the AC electrical

sub-panel.

2. Route and attach a red wire from the MP enclosure’s AC LEG 2 OUT busbar to the AC electrical

sub-panel.

3. Route and attach a green wire from the MP enclosure’s GROUND busbar to the AC electrical

sub-panel’s Ground busbar.

4. Route and attach a white wire from the MP enclosure’s AC NEUTRAL busbar to the AC electrical

sub-panel’s Neutral busbar.

AC Wiring Inspection
After verifying all AC connections are correct — and all AC terminal screws are torqued correctly —

replace the covers on the main electrical panel/sub-panel.