Magnum Energy MM-AE Series - Manual (Page 17)

©
2010 Magnum Energy, Inc.
• DC wires and cables should be tied together with wire ties or
electrical tape approximately every 6 inches. This helps improve
the surge capability and reduces the effects of inductance, which
improves the inverter waveform and reduces wear on the
inverter’s fi lter capacitors.
• Use only copper wires with a minimum temperature rating of
75°C.
• To ensure the maximum performance from the inverter, all
connections from the battery bank to the inverter should be
minimized; the exceptions are the DC overcurrent disconnect in
the positive line and a shunt in the negative line. Any other ad-
ditional connection will contribute to additional voltage drops,
and these extra connections points may loosen during use.
• All wiring to the battery terminals should be checked periodically
(once a month) for proper tightness. The torque requirement
for the DC terminals is between 10 to 12 foot-pounds. If you
don’t have a torque wrench, ensure all DC terminals are tight
and cannot move.
CAUTION: Be aware that overtightening and misthreading
the nuts on the DC terminals can cause the bolts to strip
and snap/break off.
DC Wiring
This section describes the inverter’s required DC wire sizes and the
recommended disconnect/overcurrent protection, and how to make
the DC connections to the inverter and the battery bank.
DC Wire Sizing and Overcurrent Protection
It is important to use the correct DC wire to achieve maximum ef-
fi ciency from the system and reduce fi re hazards associated with
overheating. See Table 1 to select the minimum DC wire size needed
based on your inverter model. If the distance from the inverter to the
battery bank is greater than 3 feet, use Table 2 to help determine
the minimum recommended cable sizes for longer distances. Always
keep your wire runs as short as practical to help prevent low volt-
age shutdowns, and keep the DC breaker from nuisance tripping (or
open fuses) because of increased current draw. Undersized cables
can also lower the inverter’s peak output voltage, as well as reduce
its ability to surge heavy loads.
2.0 Installation
11
Info: The DC wires must be color coded with colored
tape or heat shrink tubing; RED for positive (+), BLACK
for negative (-), and GREEN for DC ground.