Magnum Energy MS-G Series - Manual (Page 26)

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©
2015 Sensata Technologies
Installation
2.4.4 Wiring the Battery Bank
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.
Info: DO NOT connect the DC wires from the battery bank to the inverter until 1) all DC
and AC wiring is complete, 2) the correct DC and AC overcurrent protection has been
installed, and 3) the correct DC voltage and polarity have been verifi ed.
Info: For the MS-G Series inverter/charger to perform optimally, a minimum battery
bank of 200 AH is recommended for moderate loads (<1000W) and greater than 400
AH for heavy loads (≥1000W).
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 (see Appendix
B – Battery Information for guidance on wiring batteries together). The interconnecting DC wires
must be sized and rated exactly the same as those used between the battery bank and the inverter.
Place the batteries as close as practical to the inverter, 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 1” (2.5 cm) of space between the batteries to provide good air
fl ow. DO NOT mount the batteries directly under the inverter.
CAUTION: Install batteries in a well ventilated area. Batteries can produce explosive
gasses. For compartment or enclosure installations, always vent batteries to the outside.
Info: To ensure the best performance from your inverter system, batteries should be of
the same size, type, rating, and age. Do not use old or untested batteries.
2.4.5 Battery Temperature Sensor Installation and Wiring
The Battery Temperature Sensor (Figure 2-9) provides the inverter with precise battery temperature
information to automatically adjust the ABSORB and FLOAT charge voltage set-points. This allows
the batteries to be correctly charged under extreme temperature changes.
If the temperature sensor is NOT installed and the batteries are subjected to large temperature
changes, the battery life may be shortened.
The BTS cable may be extended—using a RJ11 connector (female to female) and a standard phone
cable with RJ11 connectors—to a maximum length of 40 feet (12 m). However, your inverter to
battery cable length should not exceed the recommended distance provided in Table 2-2.
Figure 2-9, Battery Temperature Sensor
To install the BTS:
1. Attach the ring terminal end of the Battery Temperature Sensor to the negative battery terminal;
see Figure 2-7 for proper connection to the battery terminal.
2. Route the sensor’s cable to the inverter following existing wire runs.
3. Connect the RJ11 connector end of the BTS cable to the yellow-labeled BTS port on the inverter
(Figure 1-1, Item 6).
FRONT VIEW
SIDE VIEW
~2" ~1"
0.375" diameter
Cable ~¾”
(~2.54 cm) (~5.1 cm)
(~1.9 cm)
(~.95 cm)
~½” (~1.3 cm)