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BEFORE YOU START
3.4
AC WIRING
The Sunmaster may only be used in a in a permanent
installation, connected to a separate AC distribution group,
to which no other electrical equipment is connected.
The cabling between the junction box or electric cable duct
and the Sunmaster must be double insulated. Use an
appropriate AC-wire diameter, so that the single wire
resistance between the Sunmaster and the AC distribution
will not exceed 0.25 Ohm. Directive: up to 25 meters
length, choose a wire diameter of 3 x 4mm². Choose a
larger wire size for lengths above 25 meter.
3.5
GROUNDING
The Sunmaster must be provided with an equipment-
grounding conductor to the AC-output ground terminal.
Grounding and all other wiring must comply with local
codes and ordinances.
Grounding of the solar array is not necessary thanks to the
galvanic isolation between the DC-input and the AC output
of the Sunmaster.
3.6
SPECIFICATIONS OF THE SOLAR SYSTEM
The solar system should meet the following specifications:
•
Maximum open circuit string voltage at lowest possible
temperature of the PV modules and maximum PV
power connected to the inverter:
Model Sunmaster
Max voltage
XS4300
550Vdc max
XS3200
600Vdc max
XS2000
450Vdc max
•
Double insulated PV-wiring
•
All cables of the string should have double insulation
and must be fitted with pre-assembled MultiContact
connectors (Ø4mm)
•
If two or more strings are connected to the same
Sunmaster, both string lengths must be equal.
.
CAUTION!
Do not install the Sunmaster if the solar-
system does not comply with the above
mentioned stipulations.
3.7
DC SWITCH
Depending on local applicable regulations the use of a DC
switch between the PV modules and the inverter may be
mandatory.
For example international standard IEC60364-7-712
prescribes a DC switch in solar electric installations in
buildings. For this reason Mastervolt offers several models
of the Sunmaster with integrated DC-switch. See chapter
3.2 to check if your Sunmaster is equipped with such a
DC-switch.
8
Max power
4600Wp
3500Wp
2100Wp
If your Sunmaster is not equipped with a DC-switch, an
external DC-Switch can be applied. Single and double
output types are available rated 600 Volts and 25A. See
chapter 8 for ordering information.
3.8
PV MODULES AND STRINGS
The solar or DC side of the system consists of several
photovoltaic (solar) modules, further mentioned as "PV
modules". The PV-modules are connected in series to
form a so called "string". These strings consist of a plus (+)
and a minus (–) connection which can be connected
directly to the Sunmaster.
The string voltage should be equal to the open circuit
voltage (Voc) per PV module (refer to the specifications of
the PV-module), multiplied by the number of PV-modules
in each string. Depending on the solar irradiation and
temperature, this value should be equal to 70-95% of the
calculated string voltage.
The Sunmaster is equipped with a single MPP tracker and
two parallel string connections, see figure 6.
1
DC
Figure 6
November 2008 / Sunmaster XS4300-3200-2000 / EN
2
AC
AC grid
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