--- title: "Growatt WIT 50K-A-US / WIT 50K-AU-US Hybrid Inverter: Specs & Datasheet | ComparePV" description: "Growatt WIT 50K-A-US / WIT 50K-AU-US 50 kW hybrid inverter. Specs: 120.0 kg, 5 yrs warranty." source: "https://comparepv.com/inverter/growatt-wit-50k-a-us-wit-50k-au-us" updated: 2026-01-16 --- # Growatt WIT 50K-A-US / WIT 50K-AU-US ## Identity - **Manufacturer:** Growatt - **Model:** WIT 50K-A-US / WIT 50K-AU-US - **Series:** WIT - **Rated AC power:** 50 kW - **Type:** Hybrid - **Phases:** Three-phase - **Battery port:** yes ## How it compares Compared against 243 inverters from 30 to 100 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | - | 98.2% | | | | MPPT trackers | - | 4 | | | | Max DC input voltage | - | 1100 V | | | | Weight per kW | 2.4 | 1.1 | Weak - bottom 5% | 213 | | Warranty | 5 yrs | 5 yrs | Typical | 17 | ## Specification ### AC output - **Rated AC power:** 50 kW - **Max apparent power:** 55.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 480 V - **Max AC current:** 66.2 A - **Power factor:** -1 ~ +1 - **Harmonic distortion (THD):** 3.0 % ### Battery - **Battery port:** Yes - **Battery voltage:** 750-1000 V - **Grid-forming:** Yes ### Physical - **Dimensions:** 1200 × 820 × 510 mm - **Weight:** 120.0 kg - **Enclosure:** NEMA/IP66 - **Cooling:** forced-air - **Operating temperature:** -30 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Display - **Protocols:** RS485, CAN, USB, WiFi (optional) - **Protection:** Surge protection ### Warranty and certificates - **Warranty:** 5 years - **Certifications:** UL1741:2021, UL1741 SA, IEEE 1547:2003, IEEE 1547.1:2005, IEEE 1547.1:2020, FCC Part 15, CSA C22.2 No.107.1, UL 1998:2018 ### Pros - **10 ms EPS Switchover Time** - The WIT 4-15K-HU datasheet (October 2024) specifies an EPS switchover time of 10 ms - comparable to dedicated UPS systems and faster than the typical 20-30 ms found in competing hybrids (e.g., Fronius Gen24 ~20 ms). This is a genuine advantage for installations with sensitive loads such as servers, pumps, and medical equipment. - **4 MPPT Trackers on 25 kW+ Models** - The WIT 25K-HU features 4 independent MPPT inputs, each rated up to 20 A of string current, enabling 4 different array orientations or tilt angles to be served without yield loss from mismatch. The 4-15 kW models include 2-3 MPPTs, which still exceeds most single-phase hybrids available at a comparable price point. - **97.0% European Efficiency, 99.9% MPPT Efficiency** - The official WIT 4-15K-HU datasheet (202410) declares a European efficiency of 97.0% and MPPT efficiency of 99.9%, with a peak efficiency of 97.6%. These figures are on par with the Sungrow SH10RT (~97.3% EU efficiency), confirming the series' competitive performance under Central European climate conditions. - **Generator Support and Smart Load Control** - The WIT series natively supports an AC generator as a backup power source, while the Smart Load Control function combined with an energy meter enables export limiting without additional hardware. This makes it a turnkey solution for commercial and industrial sites, eliminating the need to integrate external energy management systems. - **IP66 Ingress Protection and Parallel Operation of Up to 6 Units** - The IP66-rated enclosure allows outdoor installation without an additional enclosure cabinet, reducing overall BoS costs. Parallel operation of up to 6 units (available from Q2 2025) enables system scaling up to 90 kW using WIT 15K-HU inverters, making the series well-suited for flexible C&I installations. ### Cons - **No BNEF Tier-1 Bankable Status** - Growatt does not appear on the BNEF Tier-1 Bankable inverter lists (as of 2025), which may complicate or increase the cost of financing commercial and industrial projects with banks and infrastructure funds that require bankability for key system components. Competitors such as SMA, Fronius, and Sungrow hold this status. - **Standard 5-Year Warranty (vs. 10-15 Years from Premium Brands)** - Growatt provides a standard 5-year warranty with a paid extension option to 10 years, whereas SMA and Fronius offer 10-15 years of standard warranty coverage at no additional cost. Over a system lifetime of 20-25 years, this translates into the need for active warranty extension management and additional OPEX for the asset owner. - **Warranty Claim Processing Time of 23-40 Business Days** - Independent industry sources indicate an average warranty claim resolution time of 23-40 business days for Growatt, compared to 7-14 days for premium manufacturers with established regional spare-parts networks (including SMA and Huawei). This may result in extended system downtime in the event of a fault occurring outside the summer season. ## About this series Growatt WIT series are **three-phase hybrid inverters** designed for installations where not only self-consumption but also stable power supply during grid fluctuations or power supply interruptions matters. These devices feature the **UPS function** and the ability to work with generators, facilitating the construction of backup systems for homes, businesses, or industrial facilities. A large number of MPPT inputs in selected models means **better performance under shading** and flexibility in string designs for different roof orientations and tilts-without unnecessary compromises in energy yield. The high European efficiency translates into significantly higher energy production in typical operating conditions in Poland, not just at the ideal test point. Monitoring is done via loggers and the application (WiFi, LAN, optional cellular transmission), with parameter viewing and remote diagnostics. The series is designed for compatibility with **energy storage systems**, and compliance with grid standards (including EN 50549) and a solid warranty facilitate safe implementation in the commercial sector. ## Questions ### How quickly does the Growatt WIT inverter switch to backup power when the grid fails? The switchover time to UPS mode is under 20 ms, meaning that most household and office devices will not experience any interruption in power supply. This is one of the key parameters that distinguishes the Growatt WIT from standard grid-tied inverters, which simply shut down upon grid loss. As a result, the series is well suited to powering equipment sensitive to momentary outages, such as computers, alarm systems, and heat pumps. ### Can the Growatt WIT be connected to a generator as an additional energy source? Yes, the Growatt WIT series has built-in generator support, which is uncommon among hybrid inverters in this price class. The generator can automatically assist with battery charging or site power supply when the photovoltaic system and energy storage are insufficient. This solution is particularly effective for businesses and industrial facilities where continuous power availability is critical around the clock. ### Which energy storage systems are compatible with the Growatt WIT inverter? The Growatt WIT supports both lithium-ion batteries (recommended voltage 51.2 V, operating range 40-60 V) and conventional lead-acid batteries. The maximum charge and discharge current reaches 290 A, enabling rapid replenishment of the storage system. The inverter is compatible with Growatt energy storage products as well as selected third-party batteries that support BMS communication. ### What is the warranty on Growatt WIT series inverters? The standard warranty on the Growatt WIT varies by model and region: units up to 22 kW typically carry a 10-year warranty, while higher-power models are covered by a 5-year warranty with the option to extend. Growatt also offers extended service packages. It is advisable to confirm the exact terms with the local distributor before purchase, as details may differ depending on the agreement with the importer. ### How many MPPT inputs does the Growatt WIT have, and is that sufficient for a partially shaded roof? Lower-power models (4-15 kW) feature 2 independent MPPT inputs, allowing two strings operating under different irradiance conditions or with different azimuths and tilt angles to be handled simultaneously. Higher-tier models offer a greater number of MPPT inputs, providing more flexibility when designing installations on complex roof structures with dormers, chimneys, or other obstructions that cause partial shading of roof sections. ### Is the Growatt WIT inverter suitable for commercial and industrial installations in Poland? Yes, the WIT series covers models ranging from 4 kW to 100 kW, and the units comply with the EN 50549 standard, which is a mandatory requirement for grid connection in the Polish power network. Support for 100% unbalanced output across phases, a high IP66 ingress protection rating, monitoring via LAN or Wi-Fi with optional cellular connectivity, and compatibility with large-scale energy storage systems make the WIT a viable option for businesses, hotels, and public-use facilities. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/WIT-50-100K-AU-US-8ef27f8e196c.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [GoodWe GW50K-ET-10](https://comparepv.com/inverter/goodwe-gw50k-et-10) | 50 kW | 97.8% | | 65.0 kg | 55.0 kg lighter | | [Ginlong Solis S6-EH3P50K-H](https://comparepv.com/inverter/ginlong-solis-s6-eh3p50k-h) | 50 kW | 97.4% | | 73.0 kg | 47.0 kg lighter | | [Growatt MID 50K-HU](https://comparepv.com/inverter/growatt-mid-50k-hu) | 50 kW | 97.2% | | 50.0 kg | 70.0 kg lighter | | [Deye SUN-50K-SG01HP3-EU-BM4](https://comparepv.com/inverter/deye-sun-50k-sg01hp3-eu-bm4) | 50 kW | 97.0% | | 80.0 kg | 40.0 kg lighter | | [Growatt WIT 50K-AU-US](https://comparepv.com/inverter/growatt-wit-50k-au-us) | 50 kW | | | 140.0 kg | 20.0 kg heavier | | [Growatt WIT 50K-H-US / WIT 50K-HU-US](https://comparepv.com/inverter/growatt-wit-50k-h-us-wit-50k-hu-us) | 50 kW | | 10 | 60.0 kg | 60.0 kg lighter | | [Growatt WIT 50K-A](https://comparepv.com/inverter/growatt-wit-50k-a) | 50 kW | | | 120.0 kg | Similar on paper | | [Growatt WIT 50K-AU](https://comparepv.com/inverter/growatt-wit-50k-au) | 50 kW | | | 120.0 kg | Similar on paper | --- Source: https://comparepv.com/inverter/growatt-wit-50k-a-us-wit-50k-au-us