Owner`s manual

Page 7

2.0 Introduction

DC Ground Stud - This 5/16” stud is connected to the MMP enclosure chassis and is

provided as a connection point to the DC grounding electrode when the conductor is

larger than #1/0 AWG.

This 5/16” stud also connects to the DC Shunt through a busbar and serves as the DC

negative to ground connection point. If installing a PV-GFP device, this busbar must be

removed (see Section 3.12).

Note: For ground wires #1/0 AWG or smaller, use the DC Ground Busbar (Item 20).

DIN Rail Track - For installing up to eight 1/2” (12.7mm) wide, DIN rail mounted, Q-

Frame type breakers. These breakers can be used for connecting DC loads or installing

a PV-GFP device.

Mounting Holes (x8) - For installing up to four 1” (25.4mm) wide, back mounted, E-

Frame type breakers. These breakers can be used for connecting DC loads or installing

a PV-GFP device.

Inverter DC Disconnect Breaker - This disconnect is a heavy-duty high amperage circuit

breaker speciﬁ cally designed for the MMP enclosures. It provides an easy and convenient

way to isolate the inverter from the battery, and meets the NEC/CEC requirements for DC

overcurrent protection when used in accordance with the installation instructions in this

manual. The amperage rating depends on the MMP model (175 or 250 amps).

Battery Positive Connection - The bottom of the inverter’s DC disconnect is the

connection point to the positive terminal of the battery bank. The DC disconnect has a

front connected terminal with 3/8 - 16 captive nuts.

DC Positive Busbar - This busbar is connected to the battery bank positive through the

bottom of the inverter DC disconnect. This busbar is the battery positive common point

for connecting additional DC circuits, such as from the output of a charge controller or

connecting to DC load breakers.

This busbar is rated to handle 120 amps; and has dual hole sizes — two # 14 to #1/0

AWG and ﬁ ve #14 to #6 AWG — with screw type compression terminals (no ring lugs

required).

DC Negative Busbar -This busbar is connected to the battery bank negative through

the load side of the DC shunt. This busbar is the battery negative common point for

connecting additional DC circuits, such as from the DC negative output of a charge

controller or combining the negatives of DC load circuit breakers.

This busbar is rated to handle 120 amps; and has dual hole sizes — two # 14 to #1/0

AWG and ﬁ ve #14 to #6 AWG — with screw type compression terminals (no ring lugs

required).

DC Ground Busbar - This busbar is connected to the MMP enclosure chassis and is used

to tie DC equipment grounds to a common point. This terminal is also used to connect

the inverter/MMP enclosure system to the DC grounding electrode.

This busbar has dual hole sizes — two #14 to #1/0 AWG and three #14 to #6 AWG

— with screw type compression terminals (no ring lugs required).

If the DC grounding electrode conductor is greater than #1/0 AWG, use the DC Ground

Stud (Item 14) to connect the DC grounding electrode (i.e., ground rod).