The Hoymiles HM-600/HM-600P/HM-700/HM-700P/HM-800 Single-phase Microinverter is a sophisticated system designed to convert direct current (DC) from photovoltaic (PV) modules into alternating current (AC) for feeding into the public grid. This system is composed of multiple microinverters, with each unit designed to accommodate two PV modules. A key feature of this design is that each microinverter operates independently, ensuring maximum power generation from each connected PV module. This independent operation enhances the user's control over the production of individual PV modules, thereby improving the overall flexibility and reliability of the solar energy system.
Function Description:
The microinverter functions primarily to convert DC power from PV modules into AC power suitable for the public grid and household loads. It operates within a wide DC input voltage range of 16 V to 60 V, with a low start-up voltage of just 22 V. This broad operating range and low start-up voltage contribute to the system's efficiency and ability to generate power even in less-than-ideal conditions.
The microinverter supports various work modes to optimize energy management:
- Normal Mode: In this mode, the microinverter operates conventionally, converting DC power to AC power to supply household loads and export any surplus to the public grid.
- Zero Export Control Mode: This mode limits the microinverter's power generation based on the current household loads, preventing any excess power from being fed into the public grid. This is particularly useful in regions with specific grid regulations or where users prefer to consume all generated power locally.
- Standby Mode: The microinverter enters Standby mode under specific conditions, such as when operating requirements are not met, or when there are no household loads and the export control value on the DTU (Data Transfer Unit) is set to "0" in Zero Export Control mode.
The device is equipped with advanced monitoring capabilities. When an Earth Fault Alarm occurs, the LED on the microinverter will illuminate solid red every 0.5 seconds, providing an immediate visual alert. Further details and configuration options for monitoring are available through the Hoymiles monitoring app/portal, which can be accessed via the "HMP Operating Guide (Webpage) V2.0" and "HMP Operation Guide (APP)".
The microinverter also supports various power quality response modes, as specified by standards like AS 4777.2:2015. One such mode is "Power derating for voltage variation" (Volt-Watt mode), where the inverter's output power adjusts in response to voltage fluctuations at its terminal. This mode can be enabled and configured through the grid profile module on the Hoymiles monitoring platform.
Furthermore, the microinverter supports Demand Response Modes (DRM0/5/6/7/8) when installed with a DTU-Pro. This feature allows the system to respond to control signals for demand management, enhancing its integration with smart grid functionalities.
Usage Features:
The Hoymiles microinverter offers several features designed to enhance its usability and performance:
- High Efficiency: The system boasts a high CEC weighted efficiency of 96.50% and a peak efficiency of 96.70%. Its static MPPT (Maximum Power Point Tracking) efficiency is 99.80%, and dynamic MPPT efficiency is 99.76% even in overcast weather, ensuring optimal power harvesting under varying conditions.
- Wide Compatibility: It is adapted for both 60-cell and 72-cell PV panels, offering versatility in system design.
- Adjustable Power Factor: The power factor is adjustable from 0.8 leading to 0.8 lagging, allowing for grid compliance and optimization.
- Enhanced Communication: An external antenna is included for stronger communication with the DTU, ensuring reliable data transfer and monitoring.
- Robust Design: The microinverter features a NEMA 6 (IP67) enclosure, providing high reliability and protection against environmental elements. It also includes 6000 V surge protection, safeguarding the device from electrical surges.
- Easy Installation: The installation process is streamlined, involving attaching the microinverter to the rail, connecting AC cables to form a continuous branch circuit, and then connecting the AC end cable to the distribution box. The system is designed for placement underneath PV modules to ensure a shaded or shadowed environment, which helps prevent power de-rating due to increased internal temperature.
- Installation Map: A removable serial number label from each microinverter can be affixed to an installation map, simplifying system tracking and management.
- Grounding Considerations: The microinverter is a Class I equipment with a basic isolation transformer and must be earthed. Grounding can typically be achieved by using the earth wire within the AC cable. For specific utility requirements, grounding can also be done by affixing the mounting bracket to the racking.
Maintenance Features:
Routine maintenance is crucial for the longevity and optimal performance of the microinverter.
- Qualified Personnel: All maintenance operations must be carried out by authorized personnel who are responsible for reporting any anomalies.
- Personal Protective Equipment (PPE): It is mandatory to use appropriate PPE, including gloves and eye protection, during maintenance.
- Environmental Checks: Regular checks of environmental and logistical conditions are necessary to ensure the equipment is not exposed to adverse weather or covered by foreign bodies.
- Anomaly Resolution: If any problems are found, the equipment should not be used until the proper conditions are restored and the issues resolved.
- Annual Inspection: An annual inspection of various components is recommended, along with cleaning the equipment using a vacuum cleaner or special brushes.
- No Internal Repairs: Users are explicitly warned not to attempt to dismantle the microinverter or perform any internal repairs. The microinverters are not designed for internal repairs to preserve safety and insulation integrity.
- AC Output Wiring: The AC output wiring harness (AC drop cable) on the microinverter cannot be replaced. If it is damaged, the equipment must be scrapped.
- Safety Disconnection: Maintenance operations must be performed with the equipment disconnected from the grid (grid power switch off) and the PV modules obscured or isolated, unless otherwise specified.
- Cleaning Guidelines: For cleaning, avoid using rags made of filamentary materials or corrosive products that could damage parts or generate electrostatic charges.
- Genuine Spare Parts: Temporary repairs are discouraged. All repairs should be carried out using only genuine spare parts.
- Microinverter Replacement: In case of an inoperable microinverter, a structured troubleshooting process is provided. This includes verifying utility voltage and frequency, checking grid connections, inspecting AC branch circuits, ensuring AC breakers are functional, and checking DC connections and PV module DC voltage. If troubleshooting fails, the microinverter should be returned to the factory for replacement. The replacement process involves recording the new microinverter's serial number, installing the unit, and updating the monitoring platform.
- Storage and Transportation: Hoymiles ensures proper packaging for transport. Customers are advised to inspect components upon receipt for any damage. The microinverter storage temperature range is -40°C to 85°C.
- Disposal: Scrapped equipment that is potentially harmful to the environment must be disposed of properly and in accordance with local regulations.
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