© 2016 Sensata Technologies
14
Installation
2.5.1 Inverter to Battery Bank Wiring
WARNING
: Ensure all sources of DC power (i.e., batteries, solar,
wind, or hydro) and AC power (utility, shorepower or AC generator)
are de-energized (i.e., breakers opened, fuses removed) before
proceeding.
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 terminal 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 (Figure 1-4, Item 17) to a dedicated system
ground. Recommended tightening torque is 45 in-lbs (5.1 N-m).
DC Negative Wire
Route an appropriately sized DC negative wire (BLACK) from the negative
terminal of the
fi
rst battery string to the inverter’s negative terminal (see
Figure B-3 for reference).
Battery Temperature Sensor (MM1212/MM1212-G models only)
Connect the RJ11 connector end of the BTS to the ACCESSORY Port (Figure
1-3, Item 11) 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 negative DC wire
above)—refer to Figure 2-5 for the correct hardware placement.
DC Positive Wire
Mount the DC fuse block and disconnect (or circuit breaker) as near as practical
to the batteries, and then remove the fuse (or open the circuit breaker).
WARNING
: DO NOT close the DC fuse/DC disconnect (or close DC
circuit breaker) to enable battery power to the inverter at this time.
This occurs 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 short wire (same rating as the DC wires) to one end of the fuse
block and the other end of the short wire to the positive terminal of the last
battery string (see Figure B-3). This is essential to ensure even charging and
discharging across the entire battery bank.
Ensure the DC wire connections (on the batteries, inverter, and fuse lugs/DC
circuit breaker) are
fl
ush on the surface of the DC terminals and the hardware
(lock washer and nut) used to hold these connections are stacked correctly
(see Figures 2-5 & 2-6).
Verify all DC connections are torqued from 10 to 12 ft-lbs (13.6 to 16.3 N-m).
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