--- title: "Growatt MAC 66KTL3-X MV Grid-tie Inverter: Specs & Datasheet | ComparePV" description: "Growatt MAC 66KTL3-X MV 66 kW grid-tie inverter. Specs: 3 MPPT, 1100 V max DC input, 52.0 kg, 5 yrs warranty." source: "https://comparepv.com/inverter/growatt-mac-66ktl3-x-mv" updated: 2026-01-16 --- # Growatt MAC 66KTL3-X MV ## Identity - **Manufacturer:** Growatt - **Model:** MAC 66KTL3-X MV - **Series:** MAC 50-70KTL3-X - **Rated AC power:** 66 kW - **Type:** Grid-tie - **Phases:** Three-phase ## 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 | 3 | 4 | Weak - bottom 15% | 82 | | Max DC input voltage | 1100 V | 1100 V | Typical | 3 | | Weight per kW | 0.8 | 1.1 | Strong - top 14% | 32 | | Warranty | 5 yrs | 5 yrs | Typical | 17 | ## Specification ### AC output - **Rated AC power:** 66 kW - **Max AC power:** 73.30 kW - **Max apparent power:** 73.30 kVA - **Phases:** Three-phase - **Max AC current:** 88.2 A - **Power factor:** 0.8 leading - 0.8 lagging - **Harmonic distortion (THD):** 3.0 % ### PV input - **Max DC input power:** 85.80 kW - **Max DC voltage:** 1100 V - **MPPT voltage range:** 200 to 1000 V - **Start-up voltage:** 250 V - **MPPT trackers:** 3 - **Max input current per MPPT:** 13.0 A ### Efficiency - **Max efficiency:** 98.8 % ### Physical - **Dimensions:** 508 × 680 × 281 mm - **Weight:** 52.0 kg - **Enclosure:** IP65 - **Cooling:** forced-air - **Operating temperature:** -25 to 60 °C - **Max humidity:** 100 % - **Max altitude:** 4000 m ### Connectivity and protection - **Interfaces:** Wi-Fi, Display - **Protocols:** USB, RS485, WiFi, GPRS/4G (optional/standard depending on configuration) - **Protection:** DC switch, Surge protection ### Warranty and certificates - **Warranty:** 5 years - **Certifications:** CQC, CE, VDE 0126-1-1, VDE-AR-N4105, EN50438, CEI 0-21, AS 4777 ### Pros - **Peak efficiency: 98.8%** - The maximum efficiency of 98.8% places the MAC 50-70KTL3-X series above many competitors in the commercial segment (SMA Sunny Tripower Core2 achieves up to 98.5%). High European efficiency translates into tangible benefits in Polish conditions, not just in laboratory peak power. - **3 independent MPPT controllers (DC voltage range: 200-1000 V)** - Each of the 3 trackers independently optimizes the performance of a separate PV section, which, in commercial installations on building roofs or parking canopies, effectively reduces energy losses due to partial shading or different orientations of the panels. A wide MPPT range (200-1000 V DC) at a maximum voltage of 1100 V DC provides significant design flexibility for string configurations. - **Built-in Type II DC and AC SPD + IP65** - Factory-installed Class II surge protectors on both sides eliminate the need to purchase and install separate protective devices (saving several hundred złotys per UPS). The IP65 enclosure allows for direct outdoor mounting without the need for a complex rack cabinet, which reduces installation costs. - **Availability of LV and MV variants** - The series includes both low-voltage (LV) and medium-voltage (MV) versions within the same product line, allowing designers to match the topology to the existing network infrastructure of the facility without changing the inverter model and simplifying service logistics. - **RS485/USB/WLAN multi-protocol communication** - Standard RS485 and USB connections allow integration with SCADA and BMS systems without the need for additional converters, while the WLAN module enables quick configuration via the ShinePhone app and online monitoring via ShineServer. Production data is stored locally for up to 25 years. ### Cons - **The standard warranty is only 5 years.** - The standard manufacturer warranty is 5 years, while Fronius offers a 10-year warranty without additional costs, and SMA allows for an extension up to 20 years at the time of purchase. For commercial installations with an anticipated lifespan of 20-25 years, this means the need to purchase an extended warranty, which also incurs a cost. - **Lack of BNEF Tier 1 (bankable) status** - Growatt is not listed on the current list of bankable inverter manufacturers according to BloombergNEF (tier\_1\_bankable: false), which could be a barrier when seeking project financing or meeting the due diligence requirements of institutional investors and banks providing loans for large commercial and industrial (C&I) installations. ## About this series Growatt MAC 50-70KTL3-X series are **three-phase grid-tie inverters (on-grid)** for commercial and industrial installations where reliable operation, high energy yield, and convenient service are key. The application of **three independent MPPTs** facilitates designing PV fields with different orientations or partial shading - each tracker can perform individual optimization, minimizing daily yield losses. In practice, this helps better utilize rooftop areas, carports, and ground-mounted complex installations. Worthy of attention is the **high European efficiency**, which genuinely translates to better yields under typical operating conditions in Poland, not just in laboratory maximums. The series also prioritizes safety with **II-type surge protectors on both DC and AC sides** and a sealed casing facilitating installation in demanding environments. Monitoring and operation are straightforward thanks to online services and local configuration in the app, with communication including, among others, RS485, USB, and WLAN. These are not hybrid inverters - for energy storage systems, dedicated solutions should be selected. Standard features include the manufacturer’s warranty and a complete set of popular certifications for grid connection. ## Questions ### How many MPPT trackers does the Growatt MAC 50-70KTL3-X have, and why does this matter for commercial installations? The MAC 50-70KTL3-X series is equipped with 3 independent MPPT trackers. For commercial installations, this means PV strings with different orientations, tilt angles, or partial shading can be connected without mutual energy losses. Each MPPT independently optimizes its portion of the array, which is critical for industrial rooftops, carport canopies, and large ground-mounted systems with irregular layouts. ### What is the manufacturer warranty on the Growatt MAC 50-70KTL3-X inverters? The standard manufacturer warranty for the MAC 50-70KTL3-X series is 5 years. Growatt offers extended warranty options up to 10 years through optional service packages. Before purchasing, it is advisable to confirm the terms with an authorized distributor, as service scope and response times may vary depending on the specific agreement. ### Does the MAC 50-70KTL3-X operate during winter and in harsh weather conditions? Yes, the MAC 50-70KTL3-X series operates across a temperature range of -25 °C to +60 °C, fully covering the climatic conditions encountered in Poland. The enclosure carries an IP65 protection rating, guarding against dust ingress and water jets. Above 45 °C the inverter automatically derates output power to protect internal components. Built-in Type II DC- and AC-side surge protection devices provide additional safeguarding against transient overvoltages. ### Can the Growatt MAC 50-70KTL3-X be connected to an energy storage system? No, the MAC 50-70KTL3-X series consists of grid-tied (on-grid) inverters only and does not include hybrid functionality. Direct battery connection is not supported. If the installation is intended to incorporate energy storage, a dedicated hybrid inverter or a separate battery storage system compatible with a different topology must be selected. ### What efficiency does the Growatt MAC 50-70KTL3-X achieve, and does it matter for energy yield in Poland? The MAC 50-70KTL3-X series achieves a maximum conversion efficiency of 98.8% and an MPPT efficiency of up to 99.9%. The high European efficiency figure - which accounts for the irradiance distribution typical of a temperate climate - directly translates into greater annual energy production in Poland. For a 50-70 kW installation, even a fraction of a percentage point in efficiency represents a measurable difference in kilowatt-hours over the course of a year. ### What monitoring and communication options does the MAC 50-70KTL3-X series offer? The MAC 50-70KTL3-X inverters support communication via RS485, USB, and WLAN, enabling integration with energy management systems and Growatt monitoring platforms (ShineServer, ShinePhone). Local configuration and data visualization are available through the mobile application. For industrial installations with multiple inverters, daisy-chaining is supported, allowing centralized production monitoring across the entire array. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/62870bc6b90fc-e8ef3f1b3f9f.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [SolarEdge SE66.6K (K66.6SE)](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-k66-6se) | 66.6 kW | 98.0% | | | +0.6 kW | | [SolarEdge SE66.6K (K66.6SE) - Primary unit](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-k66-6se-primary-unit) | 66.6 kW | 98.0% | | 48.0 kg | +0.6 kW, 4.0 kg lighter | | [SolarEdge SE66.6K (K66.6SE) - Secondary unit](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-k66-6se-secondary-unit) | 66.6 kW | 98.0% | | 45.0 kg | +0.6 kW, 7.0 kg lighter | | [SolarEdge SE66.6K (Synergy, 277/480V)](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-synergy-277-480v) | 66.6 kW | 98.0% | | | +0.6 kW | | [SolarEdge SE66.6K (Synergy) – secondary unit (physical)](https://comparepv.com/inverter/solaredge-solaredge-se66-6k-synergy-secondary-unit-physical) | 66.6 kW | 98.0% | | 45.0 kg | +0.6 kW, 7.0 kg lighter | | [SolarEdge SE66.6K (400V grid)](https://comparepv.com/inverter/solaredge-se66-6k-400v-grid) | 66.6 kW | 98.0% | | | +0.6 kW | | [SolarEdge SE66.6K (Synergy, 380/400V)](https://comparepv.com/inverter/solaredge-se66-6k-synergy-380-400v) | 66.6 kW | 98.0% | | 32.0 kg | +0.6 kW, 20.0 kg lighter | | [SolarEdge SE66.6K (IL00IBNQ4)](https://comparepv.com/inverter/solaredge-se66-6k-il00ibnq4) | 66.6 kW | 98.0% | | | +0.6 kW | --- Source: https://comparepv.com/inverter/growatt-mac-66ktl3-x-mv