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©
2012 Magnum Energy, Inc.
Installation
2.8.6
Wiring the Battery Bank
Depending upon the voltage of the batteries you use in the installation (6 or 12 VDC), the batteries
must be wired in series, parallel, or series-parallel to provide the correct voltage. The interconnecting
DC wires should be sized and rated exactly the same as those that are used between the battery
bank and the inverter.
Place the batteries as close as practical to the MMP enclosure/inverter system, preferably in an
insulated and ventilated enclosure. Allow adequate space above the batteries to access the terminals
and vent caps (as applicable). Also allow at least one inch of space between the batteries to provide
good air
fl
ow. DO NOT mount the batteries directly under the MMP enclosure/inverter system.
Info:
To ensure the best performance from your MMP enclosure/inverter system, batteries
should be of the same size, type, rating, and age. Do not use old or untested batteries.
2.8.7
Wiring the MMP Enclosure to the Battery Bank/Inverter
WARNING:
Ensure that all AC and DC breakers are switched OFF before connecting
or disconnecting the battery cables, and that all sources of power (both AC and DC)
are disconnected from the inverter.
WARNING:
Lethal currents will be present if the positive and negative cables attached
to the battery bank touch each other. During the installation and wiring process, ensure
the cable ends are insulated or covered to prevent touching/shorting the cables.
CAUTION:
DO NOT connect the DC wires to the battery bank until: 1) all DC, AC, and
accessory wiring are completed, 2) the correct DC and AC overcurrent protection have
been installed and, 3) the correct DC voltage and polarity have been veri
fi
ed.
CAUTION:
The Magnum inverter is NOT reverse polarity protected, if this happens
the inverter will be damaged and will not be covered under warranty. Before making
the
fi
nal DC connection
from the batteries up to the inverter, verify the correct battery
voltage and polarity by 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. Ensure the cables are color-coded to avoid polarity confusion.
This section describes how to make DC connections between your Magnum inverter/charger and
the MMP enclosure, and the DC connections from the MMP enclosure to the batteries (using battery
cables provided by the installer – see Table 2-4).
1. Place the Magnum inverter onto the top of the MMP enclosure, ensuring the inverter’s DC
terminals
fi
t through the holes in the pre-installed DC positive and negative busbars within
the MMP enclosure.
2. Route the DC cables from the battery bank—with the cables not connected to the battery—and
connect them to the MMP enclosure; negative
(–)
to the bottom side of the DC shunt, positive
(+)
to the bottom side of the DC breaker. Be careful to observe proper polarity.
3. Ensure the DC wire connections (on the batteries, inverter, DC circuit breaker, and DC shunt)
are
fl
ush on the surface of the DC terminals and the hardware used to hold these connections
are stacked correctly (see Figure 2-9); and then securely tighten these DC connections. Only
after the entire installation is complete and all connections are veri
fi
ed should the DC circuit
breaker be closed to provide power to the inverter.
4. Route an appropriately sized DC grounding wire (green or bare wire) from the inverter’s DC
equipment ground terminal and from the battery bank enclosure to the DC ground busbar in
the MMP enclosure. Refer to Section 2.10 for grounding information and sizing the DC ground
wires.
