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Magnum Energy MS-PE Series User Manual

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2013 Magnum Energy, Inc.

Page 17

Installation

2.4.6

Wiring the Inverter to the Battery Bank

CAUTION: The inverter is NOT reverse polarity protected—if this happens the inverter

will be damaged and will not be covered under warranty.

Before connecting the DC

wires from the batteries to the inverter, verify the correct battery voltage and polarity

using a voltmeter. If the positive terminal of the battery is connected to the negative

terminal of the inverter and vice versa, severe damage will result. If necessary, color

code the cables (with colored tape); brown for positive (+) and blue for negative (-)

to avoid polarity confusion.

Info: The DC overcurrent device (i.e., circuit breaker or fuse) must be placed in the

positive (brown) DC cable line between the inverter’s positive DC terminal and the

battery’s positive terminal (brown); as close to the battery as possible.

DC Ground Wire
Route an appropriately sized DC grounding wire (green, green w/yellow stripe, or bare wire)

from the inverter’s DC equipment ground terminal (Item 7, Figure 1-2) to a dedicated system

ground. Recommended tightening torque is 5.1 N-m (45 in lbf). Refer to Section 2.6 for grounding

information and sizing the DC ground wires.
DC Negative Wire
Route an appropriately sized DC negative wire (marked blue) from the negative terminal of the

battery bank to the inverter’s negative DC terminal (Item 11, Figure 1-2).

Info: If installing a battery monitor such as Magnum’s ME-BMK, install a DC shunt in-

line with the negative battery cable.

DC Positive Wire
Mount the circuit breaker or fuse assembly as near as practical to the batteries and leave open

(i.e., no power to inverter).

WARNING: DO NOT close the DC circuit breaker or connect the fuse to connect

battery power to the inverter at this time. This will occur in the Functional Test after

the installation is complete.
CAUTION: If connecting live battery cables to the inverter’s DC terminals, a brief

spark or arc may occur; this is normal and due to the inverter’s internal capacitors

being charged.

1. Route and connect an appropriately sized DC positive wire (brown) from the inverter’s positive

DC terminal (Item 10, Figure 1-2) to one end of the circuit breaker (or DC fuse block).

2. Connect a short wire (same rating as the DC wires) to the other side of the DC circuit breaker

(or one end of the fuse/disconnect assembly), and the other end of the short wire to the positive

terminal of the battery bank (see Figure 2-1 for reference). This is essential to ensure even

charging and discharging across the entire battery bank.

3. Ensure the DC wire connections (on the batteries, inverter, and DC circuit breaker/fuse lugs)

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 (Figures 2-5 and 2-6).

4. Verify all DC connections are torqued from 13.6 to 16.3 N-m (10 to 12 ft lbf).
5. Once the DC connections are completely wired and tested, coat the terminals with an approved

anti-oxidizing spray.

6. Attach the red and black terminal covers over the inverter’s DC connectors, and then secure

them in place with the supplied screws.

If the batteries are in an enclosure, perform a fi nal check of the connections to the battery terminals,

and then close and secure the battery enclosure.

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