--- title: "Growatt MAX 320K-X Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Growatt MAX 320K-X 320 kW grid-tie inverter. Specs: 98.5% European efficiency, 6 MPPT, 1500 V max DC input, 126.0 kg, 5 yrs warranty." source: "https://comparepv.com/inverter/growatt-max-320k-x" updated: 2026-01-16 --- # Growatt MAX 320K-X ## Identity - **Manufacturer:** Growatt - **Model:** MAX 320K-X - **Series:** MAX 320~350K-X - **Rated AC power:** 320 kW - **Type:** Grid-tie - **Phases:** Three-phase ## How it compares Compared against 95 inverters from 100 to 500 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | 98.5% | 98.6% | Typical | 33 | | MPPT trackers | 6 | 10 | Weak - bottom 14% | 56 | | Max DC input voltage | 1500 V | 1100 V | Strong - top 24% | 1 | | Weight per kW | 0.4 | 0.6 | Strong - top 21% | 20 | | Warranty | 5 yrs | 5 yrs | Typical | 2 | ## Specification ### AC output - **Rated AC power:** 320 kW - **Max AC power:** 352.00 kW - **Max apparent power:** 352.00 kVA - **Phases:** Three-phase - **Nominal AC voltage:** 800 V - **Max AC current:** 230.9 A - **Power factor:** 0.8 leading … 0.8 lagging - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC input power:** 480.00 kW - **Max DC voltage:** 1500 V - **MPPT voltage range:** 500 to 1500 V - **Start-up voltage:** 500 V - **MPPT trackers:** 6 - **Max input current per MPPT:** 80.0 A - **Max short-circuit current per MPPT:** 100.0 A ### Efficiency - **European efficiency:** 98.5 % - **Max efficiency:** 99.0 % ### Physical - **Dimensions:** 790 × 1145 × 371 mm - **Weight:** 126.0 kg - **Enclosure:** IP66 - **Cooling:** forced-air - **Operating temperature:** -30 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 5000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Display - **Protocols:** USB, RS485, GPRS, 4G, PLC, WiFi - **Protection:** AFCI, DC switch, Surge protection ### Warranty and certificates - **Warranty:** 5 years - **Certifications:** CE, CB, IEC 62116, IEC 61727, IEC 62109, IEC 61000-6-3, IEC 60068 ### Pros - **Maximum efficiency of 99.03% - premium class** - The declared maximum efficiency of 99.03% places this series among the top performers in utility-scale string inverters; comparable models from Sungrow (SG350HX) achieve 99.0%, and SMA SUNNY CENTRAL 2750-EV approximately 98.7%. The percentage difference translates to an additional 50-60 MWh/year in output for installations of 10 MWp. - **6 MPPT × 75 A, 5 strings per MPPT** - The 75A MPPT input current acceptance allows for native compatibility with large-format modules (182 mm / 210 mm, bifacial up to ~700 Wp), eliminating the need for additional string combiners. With a total of 30 string inputs, the DC layout on large farms is simplified. - **Architecture: 1500 V DC + DC/AC ratio of 1.5** - The maximum input voltage of 1500 V allows for longer strings and lower BOS (balance of system) costs (fewer cables, lower resistive losses). A DC/AC ratio of up to 1.5 allows for intentionally over-sizing the PV array relative to the AC inverter's power, which, in the conditions typical of Poland (high partial loads), actually improves the power utilization factor and reduces the payback period. - **IP66 + SPD Type II AC and DC** - The IP66 level of protection, along with built-in Class II surge protection on both sides, eliminates the need for external protection in typical pharmaceutical applications, reducing electrical project costs and simplifying installation certification. - **Diagnosis of the I/V string + PLC option** - The integrated I/V curve measurement at the single string level enables remote detection of faults without the need for on-site service personnel. Optional PLC communication allows for the elimination of a separate communication cabling layer on the farm, which, for installations >5 MWp, significantly reduces the CAPEX of the telemetry infrastructure. ### Cons - **Not classified as a Tier 1 bankable entity by BNEF** - Growatt does not appear on the BloombergNEF list of bankable inverter manufacturers (as of 2025/2026; status: tier\_1\_bankable: false, according to the manufacturer's data). Banks that finance utility-scale projects using non-recourse project finance methods (EBI, EBRD, ING) often require inverters from BNEF Tier 1 manufacturers. The absence of this status can make it more difficult or expensive to obtain long-term financing, particularly for projects over 5 MW seeking institutional funding. ## About this series Growatt MAX 320-350K-X series represents advanced grid-tie inverters (grid-tie) of the utility-scale category, designed for large PV farms and industrial installations, where stable operation, low losses, and easy service support are crucial. The application of **6 MPPT** facilitates precise optimization of yields in fields with different orientations and uneven shading-instead of pulling down entire sections, the inverter can more effectively manage the operation of individual string groups. High **European efficiency** translates into significantly greater energy production under typical operating conditions in Poland, i.e., varying temperatures and partial loads. In practice, this means better investment profitability and lower energy costs throughout the installation's entire lifecycle. A key feature of the series is the emphasis on safety and resilience-**Type II surge protection on both the DC and AC sides** and **IP66 protection rating** assist in operation within challenging farming environments. Monitoring and diagnostics are prepared for remote management, and communication can be expanded with PLC for simplified infrastructure. This is the choice for EPCs and investors who expect scalability, control, and predictable yields. ## Questions ### What is the maximum power output of the Growatt MAX 350K-X inverter and what types of installations is it designed for? The Growatt MAX 320-350K-X series covers string inverters ranging from 320 to 350 kW, designed for large-scale utility-scale solar farms and major industrial PV installations. These are string-class devices with an AC output voltage of 800 V, compatible with PV arrays built from large-format modules (182 mm and 210 mm cell sizes) that are standard in modern EPC projects. ### What warranty does Growatt provide for the MAX 320-350K-X series? Growatt offers a standard factory warranty of 5 years for inverters rated above 40 kW, a category that includes the MAX 320-350K-X series. An extended warranty of up to 10 years is available; however, registration must be completed within 12 months of the factory shipment date. Full terms and conditions are governed by the warranty card and the agreement with the authorized distributor. ### How do the 6 MPPTs in the Growatt MAX 320-350K-X series operate, and is that sufficient for a large PV farm? Six independent Maximum Power Point Trackers (MPPT) allow separate string groups with different orientations or tilt angles to be connected to the inverter without mutual yield interference. In practice, on a farm with partial shading or combined array layouts (e.g., east-west configurations), each MPPT operates at its individual optimum rather than pulling down the output of an entire section. With a per-channel MPPT current of up to 75 A, the series is well-suited for both 182 mm and 210 mm modules. ### Can the Growatt MAX 320-350K-X inverter operate without dedicated communication cabling thanks to PLC? Yes, the MAX 320-350K-X series offers optional Power Line Communication (PLC), which transmits monitoring data over the existing AC cable infrastructure, eliminating the need to run separate RS485 or Ethernet lines. This simplifies the farm's communication infrastructure and reduces cabling costs, particularly on large sites with numerous inverters spread across wide areas. ### Is the Growatt MAX 320-350K-X suitable for harsh climatic conditions, and what is its ingress protection rating? The series carries an IP66 ingress protection rating, meaning it is fully dust-tight and protected against powerful water jets. The inverter is also equipped with Type II surge protection devices (SPD) on both the DC and AC sides, enhancing operational safety under the variable weather conditions typical of outdoor solar and wind farm sites in Poland. These features make it a sound choice for open-field installations exposed to rain, dust, and significant temperature fluctuations. ### Is Growatt a Tier 1 brand, and how does this affect the investment security of the MAX 320-350K-X series? Growatt is not classified as a Tier 1 manufacturer under standard bankability rankings (e.g., Bloomberg NEF), although it is one of the largest Chinese inverter manufacturers with global distribution and a local presence in Poland. For investors and banks financing large-scale PV farms, the absence of Tier 1 status may require additional negotiation around insurance terms or contractual security provisions. This factor should be carefully addressed during project due diligence. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/max-320-350k-x-datasheet-202503-6e048508dc96.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Sungrow SG320HX](https://comparepv.com/inverter/sungrow-sg320hx) | 320 kW | | 12 | 116.0 kg | +6 MPPT, 10.0 kg lighter | | [Sungrow SG350HX-US](https://comparepv.com/inverter/sungrow-sg350hx-us) | 320 kW | | 12 | 122.0 kg | +6 MPPT, 4.0 kg lighter | | [GoodWe GW320K-UT](https://comparepv.com/inverter/goodwe-gw320k-ut) | 320 kW | | 15 | 124.0 kg | +9 MPPT, 2.0 kg lighter | | [GoodWe GW320KH-UT](https://comparepv.com/inverter/goodwe-gw320kh-ut) | 320 kW | | 15 | 124.0 kg | +9 MPPT, 2.0 kg lighter | | [SolarEdge TerraMax Inverter SE330K](https://comparepv.com/inverter/solaredge-solaredge-terramax-inverter-se330k) | 330 kW | 98.8% | | 175.0 kg | +10.0 kW, 49.0 kg heavier | | [SOFAR 330KTLX0](https://comparepv.com/inverter/sofar-solar-sofar-330ktlx0) | 330 kW | 98.8% | | 113.0 kg | +10.0 kW, 13.0 kg lighter | | [Sungrow SG333HX](https://comparepv.com/inverter/sungrow-sg333hx) | 333 kW | 98.8% | 12 | 116.0 kg | +13.0 kW, +6 MPPT, 10.0 kg lighter | | [Growatt MAX 333K-X](https://comparepv.com/inverter/growatt-max-333k-x) | 333 kW | 98.5% | 6 | 126.0 kg | +13.0 kW | --- Source: https://comparepv.com/inverter/growatt-max-320k-x