Magnum Energy MS-AEJ Series User Manual

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2.3.6 Wiring the Inverter to the Battery Bank

CAUTION: 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 voltme-

ter. If the positive terminal of the battery is connected to the negative terminal of the in-

verter and vice versa, severe damage will result. If necessary, color code the cables (with

colored tape): red for positive (+); black for negative (-) to avoid polarity confusion.

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

tive (red) DC cable line between the inverter’s positive DC terminal and the battery’s posi-

tive terminal (red); as close to the battery as possible.

DC Ground Wire
Route an appropriately sized DC grounding wire (green or bare wire) from the inverter’s DC

equipment ground terminal (item 12 in fi gure 1-2) to a dedicated system ground. Recommended

tightening torque is 45 in lbf (5.1 Nm). Refer to section 2.6 for grounding information and sizing

the DC ground wires.
DC Negative Wire
Route an appropriately sized DC negative wire (black) from the negative terminal of the battery

bank to the inverter’s negative terminal (item 11 in fi gure 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 assembly as near as practical to the batteries and open the circuit

breaker.

WARNING: DO NOT close the DC circuit breaker 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 DC terminals, a brief spark or

arc may occur; this is normal and due to the inverter’s internal capacitors being charged.

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

terminal (item 10 in fi gure 1-2) to one end of circuit breaker (or DC fuse block).
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 block) and the other end of the short wire to the positive terminal of the bat-

tery bank (see fi gure 2-1 for reference). This is essential to ensure even charging and discharging

across the entire battery bank.
Ensure the DC wire connections (on the batteries, inverter and DC circuit breaker/fuse lugs) are

fl ush on the surface of the DC terminal’s and the hardware (lock washer and nut) used to hold

these connections are stacked correctly (see fi gures 2-9 and 2-10). Verify all DC connections are

torqued from 10 to 12 ft lbf (13.6 to 16.3 Nm).
Once the DC connections are completely wired and tested, coat the terminals with an approved

anti-oxidizing spray.
Attach the red and black terminal covers over the inverter’s DC connectors and 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 termi-

nals, then close and secure the battery enclosure.

Installation