REFUsol 20K/33K

Product catalog summary

Overview: The REFUsol 20K…33K-2T inverter series is designed for flexibility in commercial and industrial photovoltaic (PV) systems. It features two Maximum Power Point (MPP) trackers, allowing for diverse system designs with varying orientations and tilts. The inverters are lightweight and compatible with existing REFUsol systems, making them suitable for repowering applications.

Specifications: The series includes two power classes: 20 kVA and 33 kVA. Key specifications include a maximum input voltage of 1,000 V, operating input voltage range of 230 to 960 V, and a rated input voltage of 620 V. The inverters have two independent MPPTs, with the 20K model supporting up to 26.6 kWp and the 33K model up to 44 kWp of recommended PV power.

AC and DC Data: The 20K model has a rated power of 20 kW and a maximum AC power of 22 kVA, while the 33K model offers 33 kW and 36.3 kVA. Both models support a nominal grid voltage of 220/380 V or 230/400 V and a grid frequency of 50/60 Hz. The total harmonic distortion is less than 3%, and the power factor is adjustable between 0.8 inductive and 0.8 capacitive.

Efficiency and Performance: The maximum efficiency is 98.2% for the 20K and 98.6% for the 33K, with a weighted European efficiency of 98.0% and 98.2%, respectively. MPPT efficiency exceeds 99.9%, and self-consumption at night is less than 1 W.

General Features: The inverters operate in ambient temperatures from -25°C to +60°C, with derating above 45°C. They are transformerless, with an IP65 protection rating, and can operate at altitudes up to 2,000 meters. Noise levels are below 30 dBA for the 20K and below 45 dBA for the 33K.

Protection and Safety: Integrated DC switches and safety features include anti-islanding, DC reverse polarity, overtemperature, overvoltage, overcurrent, and ground fault protection. The inverters are classified as Class I with Type III overvoltage protection.

Communication and Monitoring: The inverters feature four digital inputs for EEG feed-in management and support RS485 and Ethernet connections. An optional WiFi stick is available. The REFUlog monitoring portal is included free during the 5-year warranty period.

Certifications: The inverters are certified under various standards, including EN 61000, IEC 62109, IEC 62116, and VDE 0126, ensuring compliance with international safety and performance standards.

Catalog excerpts

REFUsol 20K … 33K-2T New flexibility meets compatibility SUITABLE FOR REPOWERING APPLICATIONS Lightweight design Compatible with legacy REFUsol inverters The completely new range of REFUsol 20K…33K-2T inverter is developed for a maximum of flexibility in commercial and industrial PV systems. With two MPP trackers, each system design can be realized, including different orientations and tilts. Compact dimensions paired with a high power density per weight gives more installation location flexibility – on the rooftop or on ground mounted systems. With two power classes of 20 kVA and 33 kVA, it fits to any mid-size project. The RS485 and the Ethernet interface can be connected on the same RS485 Bus or Ethernet network for Park Control applications without the need for reconfiguration. Therefore, the devices are also best suited for repowering of existing PV plants equipped with REFUsol inverters. Four digital inputs support the EEG feed-in management (i.e. 0 %, 30 %, 60 %, 100 %). The REFUlog monitoring portal comes for free with each inverter during the warranty period of 5 years. The Ethernet connection for easy integration into the local network comes as standard, an optional Wifi-stick plug is avai

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TECHNICAL DATA DC DATA Max. recommended PV power (kWp) Max. input voltage (V) Operating input voltage range (V) Start-up input voltage (V) Rated input voltage (V) Number of independent MPPT Number of DC inputs per MPPT Max. power per MPPT Input (kW) Max. short circuit current per MPPT (A) Rated power MPPT voltage range (V) AC DATA Rated power (kW) Nominal grid voltage (V) Nominal grid frequency (Hz) Total harmonic distortion (THD) (%) Adjustable power factor range ring cable lugs (M6) Weighted european efficiency (EU/CEC) (%) MPPT efficiency (%) Feed-in start power (W) EFFICIENCY DIAGRAM Rated...

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Safety protection Anti-islanding, DC reverse polarity, Overtemperature, Overvoltage, Overcurrent, RCMU, ground fault protection String monitoring each MPPT String fuses Protection class / overvoltage category Class I / DC and AC: Type III standard External environment pollution degree Max. inverter back-feed current to the array (A) Output short circuit current (A) Output inrush current (A) COMMUNICATION Digital inputs GENERAL DATA Ambient temperature (°C) Allowable rel. air humidity range (%) Max. operating latitude (m above sea level) Noise level (dBA) Cooling Dimension H × W × D (mm) Weight...

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SINGLE LINE DIAGRAM Only 33K: current measurement, back/current diodes For 20K: 1C and 2C input is not used Anti-condensation valve DC switch DC positive poles connectors Etherne t / WiFi / GPRS interface RS 485 input cable gland / dry contact AC cable gland Heatsink / fans (only for 33K) DC negative poles connectors PERFORMANCE DIAGRAMS No responsibility is taken for the correctness of this information. Subject to modification. REFU Elektronik GmbH | Marktstraße 185 | 72793 Pfullingen | Germany | Tel. +49 7121 4332-0 | Fax +49 7121 4332-140 | [email protected] | www.refu.com Output Power vs. Grid...

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REFUsol 20K/33K

REFUsol 20K/33K

Catalog excerpts

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