--- title: "Growatt WIT 40K-XHU Hybrid Inverter: Specs & Datasheet | ComparePV" description: "Growatt WIT 40K-XHU 40 kW hybrid inverter. Specs: 4 MPPT, 1100 V max DC input, 90.0 kg, 5 yrs warranty." source: "https://comparepv.com/inverter/growatt-wit-40k-xhu" updated: 2026-01-16 --- # Growatt WIT 40K-XHU ## Identity - **Manufacturer:** Growatt - **Model:** WIT 40K-XHU - **Series:** WIT Hybrid Inverter - **Rated AC power:** 40 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 | 4 | Typical | 34 | | Max DC input voltage | 1100 V | 1100 V | Typical | 3 | | Weight per kW | 2.2 | 1.1 | Weak - bottom 6% | 211 | | Warranty | 5 yrs | 5 yrs | Typical | 17 | ## Specification ### AC output - **Rated AC power:** 40 kW - **Max apparent power:** 44.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 400 V - **Max AC current:** 66.7 A - **Grid frequency:** 50 Hz - **Power factor:** -1…+1 - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC input power:** 80.00 kW - **Max DC voltage:** 1100 V - **MPPT voltage range:** 180 to 1000 V - **Start-up voltage:** 195 V - **MPPT trackers:** 4 - **Max input current per MPPT:** 40.0 A - **Max short-circuit current per MPPT:** 50.0 A ### Efficiency - **Max efficiency:** 98.1 % ### Battery - **Battery port:** Yes - **Battery voltage:** 200-900V - **Max charge current:** 165.0 A - **Max discharge current:** 165.0 A - **Grid-forming:** Yes ### Physical - **Dimensions:** 585 × 920 × 320 mm - **Weight:** 90.0 kg - **Enclosure:** IP66 - **Cooling:** forced-air - **Noise:** 55 dB - **Operating temperature:** -30 to 60 °C - **Max humidity:** 95 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Ethernet, Display - **Protocols:** RS485, USB, CAN, WiFi (optional), LAN/Ethernet (optional) - **Protection:** Surge protection ### Warranty and certificates - **Warranty:** 5 years - **Certifications:** NRS 097-2-1:2017, EN 50549-1, NC RFG, PSE-2018, PTPiREE-2021, IEC 62116, IEC 61727, G99:2020, VDE 4105, IEC/EN 61000-6-1, IEC/EN 61000-6-3, IEC/EN 62477-1, IEC/EN 62109-1, IEC/EN 62109-2 ### Pros - **IP66 Ingress Protection - Above Industry Norm** - WIT-HU series models carry an IP66 ingress protection rating, while competing products such as the Growatt SPH TL3 BH-UP and many Fronius Symo Hybrid inverters are rated only IP65. IP66 guarantees complete dust-tight sealing and protection against powerful water jets, directly extending the service life of outdoor installations. - **10 ms UPS Switchover Time** - The transition to backup mode is completed within 10 ms, well below the 20 ms tolerance threshold defined by IEC 62040-3 for sensitive electronic equipment. By comparison, standard on-grid inverters typically switch in 20-100 ms. - **4 Independent MPPTs (XHU Models) + 150% Off-Grid Overload Capacity** - Commercial WIT 29.9-50K-XHU models feature 4 independent MPPT trackers with 8 string inputs, a maximum DC input voltage of 1,100 V, and 150% overload capability in off-grid mode. The manufacturer's October 2024 datasheet confirms no power derating up to 50 °C ambient temperature. - **Up to 98.2% Efficiency (XHU Models)** - The WIT 29.9-50K-XHU series achieves a peak efficiency of 98.2%, on par with leading SMA and Huawei models in the commercial three-phase hybrid segment. The smaller WIT-HU models are rated at 97.6%. - **Black Start Capability and Smart Load Management** - The WIT series supports black start functionality - the ability to bring the system online without grid voltage - as well as smart load control. These features set it apart from basic three-phase hybrids at a comparable price point, making it a sound choice for facilities that require energy autonomy. ### Cons - **Not Listed as a BNEF Tier 1 Bankable Manufacturer** - Growatt does not appear on the BNEF Tier 1 bankable inverter manufacturers list (confirmed by manufacturer data: tier\_1\_bankable: false). This may complicate project financing with independent commercial lenders and reduce the asset valuation of PV installations when sold to institutional investors. - **Extended Warranty Claim Processing Times** - Independent reviews and installer feedback (igrowattinverter.com, DIY Solar Forum 2024-2025) indicate warranty claim resolution takes 23-40 business days. Premium suppliers such as SMA and Fronius maintain local replacement unit inventories and resolve claims within 5-10 days. The quality of technical support varies by region. - **WIT-HU Models Restricted to 48 V Battery Systems** - Residential WIT 4-25K-HU models are compatible only with low-voltage 48 V batteries (e.g., Growatt AXE, up to 150 A charge current), whereas competing platforms such as the SMA Sunny Tripower Hybrid and Huawei SUN2000-HV support high-voltage battery systems rated 100-550 V, offering greater flexibility in battery selection. ## About this series The **Growatt WIT Hybrid Inverter** series comprises three-phase hybrid inverters designed for operation with photovoltaic systems and energy storage batteries-both in on-grid configurations and off-grid scenarios. These inverters stand out due to their emphasis on achieving high yields and offering flexible configuration options: WIT models feature multiple MPPTs, simplifying the design of rooftop installations with varying orientations and minimizing energy losses from partial shading, as each independent tracker optimizes the performance of its own module array. In practice, this translates to improved **European efficiency**, meaning higher energy production under typical operating conditions in Poland. A significant advantage is the comprehensive communication and monitoring capabilities-online monitoring, network integration, and remote parameter management via the platform and app. The WIT is engineered for compatibility with **battery energy storage systems** (including high-voltage setups) and solutions requiring robustness in challenging environments, thanks to its weatherproof enclosure. This makes it an excellent choice for residential and commercial installations, as well as facilities prioritizing reliable backup power, complete certification packages, and clear warranty conditions. ## Questions ### How many MPPT trackers does the Growatt WIT inverter have, and is that sufficient for a roof with multiple pitches? The Growatt WIT 8-15K-HU models feature 2 independent MPPT trackers, allowing two separate strings with different orientations or roof tilt angles to be connected. Each tracker independently optimizes its own array, so partial shading on one roof pitch does not reduce the yield from the other. For a typical gable roof in Poland, this configuration is fully adequate. ### Which battery storage systems are compatible with the Growatt WIT hybrid inverter? The Growatt WIT series is compatible with lithium-ion (LiFePO4) and lead-acid batteries in the low-voltage range of 40-60 V, while newer variants also support high-voltage energy storage systems. BMS communication is handled via RS485 or CAN. Growatt offers its own AXE battery lineup, and the system can be scaled to over 30 kWh of total capacity. ### What is the efficiency of the Growatt WIT inverter, and how much energy will it realistically produce in Poland? The peak efficiency of the WIT 8-15K-HU series is 97.6%, while the European efficiency (weighted for actual solar irradiance conditions across Europe) reaches 97.0%. European efficiency is the critical parameter for evaluating real-world yield: a higher value means lower losses on overcast days and at partial load - conditions that dominate the Polish climate. ### Does the Growatt WIT inverter provide backup power (UPS functionality) during a grid outage? Yes, the WIT series has a built-in UPS function with a switchover time of just 10 ms, which is imperceptible to the vast majority of electrical appliances. Upon detecting a grid failure, the inverter automatically switches to island mode, supplying the home from the battery and PV panels. A connected and sufficiently charged energy storage system is required for this functionality. ### What warranty does the Growatt WIT hybrid inverter carry, and can it be extended? The standard manufacturer's warranty for the Growatt WIT series is 5 years, with the option to extend it to 10 years upon fulfilling Growatt's conditions. The inverter features an IP66-rated enclosure, protecting the electronics against rain and dust both indoors and outdoors, thereby reducing the risk of mechanical damage during operation. ### How can the Growatt WIT inverter be monitored, and is remote management available? The Growatt WIT integrates with the ShineServer cloud platform and the ShinePhone mobile app, both available free of charge. Connectivity is established via Wi-Fi or LAN using the communication module included in the package or available as a separate accessory. This allows users to track real-time energy production, battery state of charge, and household consumption, as well as remotely adjust inverter operating parameters without requiring an on-site service visit. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/WIT-299-50K-XHU-EU-Datasheet-EN-202401-fae9e66daa67.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [GoodWe GW40K-ET-10](https://comparepv.com/inverter/goodwe-gw40k-et-10) | 40 kW | 97.8% | | 62.0 kg | 28.0 kg lighter | | [Ginlong Solis S6-EH3P40K-H](https://comparepv.com/inverter/ginlong-solis-s6-eh3p40k-h) | 40 kW | 97.4% | | 73.0 kg | 17.0 kg lighter | | [Growatt MID 40K-HU](https://comparepv.com/inverter/growatt-mid-40k-hu) | 40 kW | 97.2% | | 48.0 kg | 42.0 kg lighter | | [Deye SUN-40K-SG01HP3-EU-BM4](https://comparepv.com/inverter/deye-sun-40k-sg01hp3-eu-bm4) | 40 kW | 97.0% | | 80.0 kg | 10.0 kg lighter | | [Growatt WT 40K-H-US L2 / WT 40K-HU-US L2](https://comparepv.com/inverter/growatt-wt-40k-h-us-l2-wt-40k-hu-us-l2) | 40 kW | | 2 | 140.0 kg | -2 MPPT, 50.0 kg heavier | | [Growatt WIT 40K-A-US L2 / WIT 40K-AU-US L2](https://comparepv.com/inverter/growatt-wit-40k-a-us-l2-wit-40k-au-us-l2) | 40 kW | | | 120.0 kg | 30.0 kg heavier | | [PowMr SOLXPOW X4-40K](https://comparepv.com/inverter/powmr-solxpow-x4-40k) | 40 kW | | | 72.0 kg | 18.0 kg lighter | | [Growatt MID 36K-HU](https://comparepv.com/inverter/growatt-mid-36k-hu) | 36 kW | 97.2% | | 48.0 kg | -4.0 kW, 42.0 kg lighter | --- Source: https://comparepv.com/inverter/growatt-wit-40k-xhu