The Siemens SINVERT Solar MASTER is an industrial central photovoltaic inverter unit belonging to a modular MASTER/SLAVE configuration designed for large-scale photovoltaic power plants.
A fundamental point for correct identification is the designation shown on the label:
SOLAR_PRJ_1000 MS TL
“SOLAR_PRJ_1000 MS TL” identifies the complete 1000kW project/system configuration, consisting of an approximately 500kW MASTER section and an approximately 500kW SLAVE section.
The MASTER manages its own power conversion stage and also performs the control and coordination functions of the SLAVE unit; together, the two sections form the complete 1MW photovoltaic inverter system.
This designation should not be interpreted as an individual 1000kW rating for the MASTER cabinet alone. In the photographed system, the configuration consists of two coordinated units:
MASTER Unit: approximately 500kW
SLAVE Unit: approximately 500kW
Total MASTER + SLAVE system power: approximately 1000kW / 1MW
The MASTER section represents the main unit of the system and performs photovoltaic power conversion, operational control, operating sequence management, diagnostics and coordination of the associated configuration. The SLAVE section, also rated at approximately 500kW, forms the second power unit and operates in coordination with the MASTER.
In this architecture, the value 1000 shown in the project designation identifies the overall power class of the combined inverter system, rather than the standalone power rating of the individual MASTER unit.
The MS designation is consistent with a Master/Slave configuration, while TL indicates a Transformerless solution, meaning that no isolation transformer is integrated into the inverter section.
⚙️ Main Features
Siemens central photovoltaic inverter
Main MASTER unit
MASTER unit power: approximately 500kW
Designed for coordination with an approximately 500kW SLAVE unit
Total MASTER + SLAVE configuration power: approximately 1000kW / 1MW
Modular Master/Slave architecture
Transformerless / TL technology
Industrial and utility-scale application
Multi-cabinet system
Centralized configuration control
Industrial forced-air cooling
Siemens power electronics
Integrated diagnostics and protection functions
📋 Technical Specifications
Brand: Siemens
Product Range: SINVERT Solar
Configuration: MASTER / SLAVE
Unit Described: MASTER
Visible Part Number: A5E03360675
Label Designation: SOLAR_PRJ_1000 MS TL
Visible MASTER Reference: 102443326
Order Reference: 3458898 / 000070
Indicative MASTER Unit Power: approximately 500kW
Indicative Associated SLAVE Unit Power: approximately 500kW
Total Configuration Power: approximately 1000kW / 1MW
Topology: Transformerless / TL
Control Architecture: Master/Slave
Number of MPPTs: to be verified against the exact technical documentation for this configuration; it should not be stated as “1 MPPT” without confirmed evidence
Application: Large-scale industrial photovoltaic systems
Visible Label Date: 31.01.2011
🔄 MASTER / SLAVE Configuration Operation
The operating principle can be described as follows:
The MASTER is an approximately 500kW power inverter that also acts as the main management unit.
When connected to the corresponding approximately 500kW SLAVE unit, the system reaches a total power of approximately:
500kW MASTER + 500kW SLAVE = 1000kW / 1MW
This configuration distributes energy conversion across two coordinated power sections instead of concentrating the entire 1MW capacity in a single independent inverter unit.
The MASTER can manage and coordinate operational aspects of the configuration, while the SLAVE contributes its own conversion section to the total available system power.
🔧 Difference Between MASTER and SLAVE
MASTER
Indicative Power: approximately 500kW
Main unit of the configuration
Operational management and coordination
Conversion of its own share of power
Main control interface
System diagnostics
Coordination with the SLAVE unit
SLAVE
Indicative Power: approximately 500kW
Associated secondary unit
Conversion of its own share of power
Coordinated operation with the MASTER
Contribution to total system power
Complete System
MASTER 500kW + SLAVE 500kW
Total Power: approximately 1000kW / 1MW
⚡ Internal Siemens SBM Solar Module
The photographs also identify an internal Siemens module with the following data:
Brand: Siemens
Series: SBM SOLAR
Order Number: A5E02556717
Factory / Serial Number: F2B1004600
Maximum Current Imax: 1025A
Trigger Threshold Von: 820V
Input Voltage Vin: DC 510–650V
Pulse Power: 840kW
Minimum Resistance: 0.8 Ohm -8%
Revision: Issue A
Manufactured in: Germany
It is important to specify that the 840kW value refers to the Pulse Power parameter of the SBM Solar module and does not represent the nominal AC output power of the individual MASTER inverter.
⚠️ Possible Errors and Fault Conditions
The system may experience faults related to:
Overcurrent
Overload
Overtemperature
MASTER-SLAVE communication error
SLAVE unavailable
Synchronization error between units
DC voltage anomaly
Photovoltaic field insulation fault
Grid voltage outside permitted limits
Grid frequency outside permitted limits
Power module fault
Cooling or ventilation fault
Contactor fault
Auxiliary circuit fault
Thermal shutdown
Control electronics fault
🔌 Compatibility
Suitable for:
Large photovoltaic power plants
Utility-scale installations
Siemens SINVERT Solar configurations
MASTER/SLAVE systems
Photovoltaic plant revamping
Replacement of compatible units
Recovery of Siemens industrial spare parts
📦 Product Condition
Used central inverter
MASTER unit
Cosmetic condition as shown in the photographs
Signs of use and storage
Surface dust and dirt present
Identification labels visible
Internal completeness to be verified
Operation to be verified through professional testing
Recommended for sale as a used industrial unit, replacement part or component for a compatible system
