User Manual
English 7
PROsine Inverter Owners Manual
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 PROsine 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 PROsine Inverter is in
bypass mode, this connection (neutral of the
PROsine Inverters 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 PROsine 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 PROsine Inverters. In
addition, electrical codes require GFCI protection of
certain receptacles in residential installations. While
the true sine wave output of the PROsine Inverter is
equivalent to the waveform provided by utilities,
compliance with UL standards requires us to test and
recommend specific GFCIs.
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 PROsine 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 0.0506V. 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 0.0506V by 20 to get a total voltage
drop of 1.012V. If your battery voltage is only 11.2VDC,
then the actual voltage at the inverter is 10.188 (11.2V -
1.012V) because of this significant voltage drop. The
PROsine 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 0.02VDC
(multiplied by 20, you get a total voltage drop of
0.4VDC). 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. Statpower
recommends the following cables for optimum inverter
performance (apply to both 120V and 230V versions).
PROsine 1000/12: #0 AWG or 55 mm
2
PROsine 1000/24: #6 AWG or 13 mm
2
PROsine 1800/12: #4/0 AWG or 110 mm
2
PROsine 1800/24: #2 AWG or 34 mm
2
Also, use only high quality copper wiring and keep cable
length short, a maximum of 3-6 ft.
Statpower, in researching the requirements for inverter
use in different markets, provides the following table
that outlines the minimum DC cable size and maximum
fuse/breaker size allowed by different regulatory bodies
Statpower has tested the following GFCI-protected 15A
receptacles and found that they functioned properly
when connected to the AC output of the PROsine
Inverter:
2.4.4 Making DC Wiring Connections
Follow this procedure to connect the battery cables to
the DC input terminals on the PROsine Inverter. Your
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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3102000.01010.01020.02030.02040.03050.03060.0
4352000.07210.03520.00830.06050.03360.09570.0
Table 3. Voltage drop per ft of DC cable