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AC Safety Grounding: During the AC wiring
installation, AC input and output ground wires are
connected to the inverter. The AC input ground wire
must connect to the incoming ground from your AC
utility source. The AC output ground wire should go to
the grounding point for your loads (e.g. a distribution
panel ground bus).
Neutral Grounding:
a) 120V models: The neutral conductor of the AC
output circuit of the Sine Wave Inverter is
automatically connected to the safety ground during
inverter operation. This conforms to National
Electrical Code requirements that separately derived
AC sources (such as inverters and generators) have
their neutral conductors tied to ground in the same
way that the neutral conductor from the utility is
tied to ground at the AC breaker panel. For models
configured with a transfer relay, when AC utility
power is present and the Sine Wave Inverter is in
bypass mode, this connection (neutral of the
inverter's AC output to input safety ground) is not
present so that the utility neutral is only connected
to ground at your breaker panel, as required.
b) 230V models: There is no connection made inside
the Sine Wave Inverter from either of the line
conductors (line or neutral) to the safety ground.
2.4.3 Ground Fault Circuit Interrupters (GFCIs)
Installations in Recreational Vehicles (for North
American approvals) will require GFCI protection of
all branch circuits connected to the AC output of the
hardwire terminal equipped Sine Wave Inverters. In
addition, electrical codes require GFCI protection of
certain receptacles in residential installations. While the
true sine wave output of the Sine Wave Inverter is
equivalent to the waveform provided by utilities,
compliance with UL standards requires us to test and
recommend specific GFCIs.
Xantrex has tested the following GFCI-protected 15 A
receptacles and found that they functioned properly
when connected to the AC output of the inverter:
Xantrex Sine Wave Inverter Owner's Manual
2.4.4 Making DC Wiring Connections
Follow this procedure to connect the battery cables to
the DC input terminals on the Sine Wave Inverter. Your
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With Line/Load inversion check & indicator light
**
Hospital Grade
cables should be as short as possible (ideally, less than
10 ft./3 m) and large enough to handle the required current,
in accordance with the electrical codes or regulations
applicable to your installation. Cables that are not an
adequate gauge (too narrow) or are too long will cause
decreased inverter performance such as poor surge
capability and frequent low input voltage warnings and
shutdowns.
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Table 3. Voltage drop per ft of DC cable
These low input voltage warnings are due to DC voltage
drop across the cables from the inverter to the batteries.
The longer and narrower these cables, the greater the
voltage drop. Table 3 shows voltage drop per foot of
cable, at various power output levels.
For example, if the 1800 Inverter is 10 ft. from your
battery, is operating at 2000 watts, and is improperly
connected with #4AWG wire, then you can expect a
voltage drop per foot of 0.0506 V. Total cable length is
actually 20 ft., not 10 ft., since the cable length is
measured from the battery to the inverter and back.
Therefore, multiply 0.0506 V by 20 to get a total voltage
drop of 1.012 V. If your battery voltage is only 11.2 VDC,
then the actual voltage at the inverter is 10.188 (11.2 V–
1.012 V) because of this significant voltage drop. The
Sine Wave Inverter will either be in low input voltage
warning or shutdown in such a condition. In high current
draw and surge situations, the unit may go into low
input voltage shutdown if the cables are too small and
too long.
Increasing your DC cable size will help improve the
situation. With cables sized correctly, and using a #0
AWG cable, your voltage drop will be 0.02 VDC
(multiplied by 20, you get a total voltage drop of 0.4 VDC).
This illustrates that at 10 ft. away from the battery and
with large cables, you can expect voltage drop. Again,
try to keep cable length to a minimum and use the
maximum gauge cable possible. Xantrex recommends
the following cables for optimum inverter performance
0
2
5
0
0
3
0
0
0
(apply to both 120 V and 230 V versions).
0
2
5
0
3
0
0
1000/12: #0 AWG or 55 mm
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1000/24: #6 AWG or 13 mm
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1800/12: #4/0 AWG or 110 mm
0
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1
2
5
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1
5
0
1800/24: #2 AWG or 34 mm
2
6
0
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1
5
8
0
0 .
1
8
9
5
8
0
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1
9
8
0
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2
3
7
Also, use only high quality copper wiring and keep cable
0
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0 .
2
5
0
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3
0
0
length short, a maximum of 3–6 ft.
5
2
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1
5
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3
7
8
1
8
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3
9
8
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4
7
7
Xantrex, in researching the requirements for inverter use
0
2
0
0 .
5
0
3
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6
0
3
in different markets, provides the following table that
0
6
0
0 .
6
3
3
0
0 .
7
5
9
outlines the minimum DC cable size and maximum fuse/
breaker size allowed by different regulatory bodies
2
2
2
2
English
7
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