SMA Sunny Highpower Peak3 Commercial Inverter Setup Guide

Key Takeaways

• The SMA Sunny Highpower PEAK3 (SHP 100-20 / SHP 100-20) is a 1500V DC commercial string inverter.
• It supports flexible DC input configurations, including direct string or centralized combiner box connections.
• Central control of decentralized PEAK3 inverters is managed by the SMA Data Manager M via Speedwire fieldbus networks.
• Always switch off the DC input isolator and wait 5 minutes for capacitor discharge before servicing.

Understanding the SMA Sunny Highpower PEAK3 Inverter

The SMA Sunny Highpower PEAK3 (SHP 100-20 / SHP 100-20) is a commercial string inverter designed for large-scale photovoltaic (PV) installations. These inverters operate on high-voltage DC bus architectures, providing high power density suitable for commercial arrays. The system architecture is typically decentralized, with individual inverters distributed across the PV array, but centrally managed.

Core Components and System Architecture

The SMA Sunny Highpower PEAK3 is engineered for decentralized PV systems, where multiple inverters are deployed across a large solar array. This approach allows for a central inverter layout, optimising power conversion and management.

Commercial inverters like the PEAK3 operate on high-voltage DC bus architectures. This design choice enables them to deliver high power density, which is crucial for large commercial arrays where efficiency and space utilisation are paramount.

DC Connection and Combiner Box Integration

The SMA Sunny Highpower PEAK3 offers flexibility in how DC power from the solar modules is connected. It supports flexible system architectures, allowing direct DC string connection or centralized DC combiner inputs.

• Direct DC String Connection: Individual strings of solar modules can be connected directly to the inverter. This method is common in smaller commercial installations or specific array layouts.
• Centralized DC Combiner Inputs: For larger or more complex arrays, multiple strings can be combined in external DC combiner boxes. These combiner boxes then feed a single, higher-current DC input to the inverter. This simplifies wiring and can improve system safety and maintenance.

Networking and Central Control with SMA Data Manager M

In SMA PEAK3 systems, the decentralized inverters are controlled centrally. This central control is facilitated by the SMA Data Manager M, which communicates with the inverters via Speedwire fieldbus networks. The Data Manager M acts as the central intelligence, enabling monitoring, control, and data logging for the entire PV plant. This setup allows for efficient operation and remote management of the inverter fleet.

Safety Protocols for Installation and Maintenance

Safety is paramount when working with high-voltage commercial inverters. The SMA Sunny Highpower PEAK3 incorporates several safety features and requires adherence to specific protocols.

One critical safety measure involves the safe DC disconnect and capacitor discharge procedure. Before performing any work on the inverter, you must switch off the DC input isolator. After switching off, it is essential to wait at least 5 minutes for internal capacitors to discharge. This waiting period ensures that residual electrical energy stored within the inverter's capacitors dissipates, preventing electric shock hazards.

Proper earthing is also crucial. You must bond the inverter chassis ground and any associated metal enclosures to the main installation earthing terminal. This protective enclosure earth bonding ensures that in the event of an electrical fault, current is safely directed to the earth, protecting personnel and equipment.

The inverter also features certified anti-islanding protection, ensuring it safely disconnects from the grid during power outages to protect utility workers. It is compatible with standard single-phase and three-phase electrical distribution systems, supporting various grid connection requirements.

What you can check yourself, and what you cannot

As a system owner or operator, you can perform basic visual inspections and monitor system performance through the SMA Data Manager M or Sunny Portal. This includes checking for error messages, verifying power output, and ensuring communication is active.

However, any work involving opening the inverter enclosure, making or changing electrical connections, or troubleshooting internal components must be performed by an accredited installer or qualified service technician. This is due to the high voltages present (up to 1500V DC) and the need for specialised tools and knowledge. Attempting internal repairs without proper training and authorisation can lead to serious injury or damage to the equipment. Always ensure the DC input isolator is switched off and the 5-minute discharge time is observed before any interaction with the inverter's electrical components.

What the published sources do not tell you

While official documentation provides key specifications and features, detailed installation procedures, specific wiring diagrams, and comprehensive troubleshooting guides are typically found in the full engineering manual provided by SMA. These manuals contain critical information regarding cable sizing, torque settings for terminals, specific communication cable requirements (e.g., shielded twisted-pair cables for Speedwire), and environmental considerations for optimal performance. Information on specific grid connection requirements, which can vary by Distribution Network Operator (grid operator) in Great Britain, is also not detailed in general product specifications and must be obtained from the grid operator or a qualified installer. The specific operational parameters of the OptiCool active fan cooling system, beyond its existence, are also not detailed.