Magnum Energy MMS Series User Manual

Page 25

Inc.

Installation

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 ter-
minal 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 or
heat shrink tubing; RED for positive (+), and BLACK for
negative (-) to avoid polarity confusion.

Info: The DC overcurrent device (i.e., fuse or circuit
breaker) must be placed in the positive (RED) DC cable
line between the inverter’s positive DC terminal and the
battery’s positive 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 Ground Terminal (see Figure 3, Item
11) to a dedicated system ground. Recommended tightening torque
is 45 in-lbs.
DC Negative Wire
Route an appropriately sized DC negative wire (BLACK) from the
negative terminal of the last battery string to the inverter’s negative
terminal (see Figure 21 for reference).
Battery Temperature Sensor
Connect the RJ11 connector end of the BTS to the ACCESSORY PORT
(see Figure 4, Item 15) on the inverter. Connect the other end of the
BTS to the negative terminal of the fi rst battery string (in same place
as the DC negative wire above); refer to Figure 11 for the correct
hardware placement.
DC Positive Wire
Mount the DC fuse block and disconnect (or circuit breaker assembly)
as near as practical to the batteries, and then open the disconnect
(or circuit breaker).

WARNING: DO NOT close the DC fuse/DC disconnect (or
close the DC circuit breaker) to enable battery power to
the inverter at this time. This will occur in the Functional
Test after the installation is complete.

Route and connect an appropriately sized DC positive wire (RED)
from the DC fuse block (or circuit breaker assembly) to the inverter’s
positive DC terminal.
Connect a wire (same rating as the DC wires) to one end of the fuse
block and the other end of this wire to the positive terminal of the
fi rst battery string (see Figure 21). This is essential to ensure even
charging and discharging across the entire battery bank.