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EN / SunMaster CS15TL RP / CS20TL RP / CS30TL RP
9 SPECIFIC DC CONFIGURATIONS
This chapter describes specific features of special
installations and options using the CS inverter. It was
written to be an addition to chapter 5 General Installation
and Commissioning.
9.1 ISOLATION DETECTION
Every morning, before the SunMaster CS connects itself
to the grid and initiates power conversion, it measures the
isolation resistance of the PV installation. This measurement
is an important safety check and a mandatory procedure for
transformerless inverters.
Due to conflicting safety requirements in different European
grid and safety standards, it is possible that a healthy PV
installation still triggers the isolation protection mechanism
causing unwanted warnings and reducing the installation’s
energy yield. For more information about this topic, please
visit the Mastervolt website or contact your supplier.
In order to retain the flexibility of use with different PV
installations, Mastervolt CS inverters offer the option to
adjust the protection trip levels for the isolation measurement.
The following settings are available:
CS15TL RP CS20TL RP CS30TL RP
High Setting
Complies with
VDE 0126-1-1 1200 kΩ 1200 kΩ 1200 kΩ
Default Setting
Complies with
UL 1741 700 kΩ 550 kΩ 350 kΩ
Low Setting
Complies with
UL 1741 when
PV inputs
are paralleled 400 kΩ 300 kΩ 200 kΩ
The default settings in the inverter are safe. Do not change
the settings unless the installation requires to do so.
9.2 USING A STRINGMASTER PRO
9.2.1 DC Distribution
The CS inverter has two independent solar inputs. To
accommodate more than two strings, StringMaster and
Switchmaster string boxes are available.
Refer to the StringMaster manual for installation instructions.
To release the MultiContact connectors, use of the special
MultiContact tool is recommended.
When more than three strings are paralleled, they must be
fused. For fuse ratings refer to specifications of used fuse.
All strings connected to the same Solar-input should consist
of the same number of identical PV modules. Measure the
solar voltage for each input.
The calculated string voltage equals the open circuit voltage
(Uoc) per PV module (refer to the specifications of the PV
module), multiplied by the number of PV modules
in each string.
9.3 DC SWITCH
A DC switch may be mandatory in your country. It can be
purchased separately or integrated in a StringMaster
stringbox. Refer to section 9.3 for more information and to
chapter 14 for ordering information. The DC switch is
included in the optional Switch- and StringMasters.
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