What is the MID 50KTL3-X2?
- AC output: 50,000 W rated (55,500 VA max), three-phase 380/400 V, 84.1 A max output current
- PV input: up to 75,000 W — a DC/AC ratio of up to 1.5
- MPPT: 4 trackers, 2 strings each (8 strings total), 200–1,000 V window, 32 A per tracker
- Efficiency: 98.8% peak, 98.5% European weighted, with built-in string-level monitoring
- Protection: Type II SPD on both DC and AC, DC switch, AFCI arc-fault detection, RCMU, anti-islanding — IP66 enclosure
The Growatt MID 50KTL3-X2 is a 50 kW three-phase on-grid inverter for commercial work: mid-sized factories, warehouses, hotels, resorts, and villa clusters sharing a three-phase supply. What makes it practical on real sites is four MPPT trackers accepting eight strings, so the array can follow the roof planes that actually exist, plus integrated protection — Type II surge arrestors on both DC and AC sides and AFCI arc-fault detection — which reduces the number of external enclosures the installation needs.
What is the Growatt MID 50KTL3-X2, and what scale of project is it for?
The MID 50KTL3-X2 sits in Growatt's commercial and industrial line, between residential units and the 100 kW-plus class. Fifty kilowatts is the size we specify most often for Phuket hotels, small factories and commercial buildings, because it covers a mid-sized building's daytime load in a single unit rather than several residential inverters, which complicate both cabling and monitoring. Accepting 75,000 W of PV against a 50,000 W AC rating allows a DC/AC ratio up to 1.5 — standard practice in commercial design, trading a few hours of clipping on the brightest days for materially higher annual yield. The built-in string monitoring matters just as much: on a system with dozens of modules, a single underperforming string disappears into the total unless the inverter reports each string separately.
Highlights from the datasheet
- 4 MPPTs, 8 strings: divide the array across up to four roof orientations — practical on factory and multi-span commercial roofs
- DC/AC ratio up to 1.5: 75,000 W of PV into a 50,000 W inverter lifts annual production without adding hardware
- String-level monitoring: spot an underperforming string quickly, whether the cause is shading, soiling or a loose connector
- AFCI arc-fault detection: shuts down on DC arcing, the leading cause of fire incidents in large PV systems
- Integrated Type II SPDs, DC and AC: lightning surge protection built in — relevant during the southern Thai rainy season — without extra enclosures
- IP66 with smart air cooling: a step above the common IP65 rating, with cooling modulated to actual load
- 98.5% European efficiency: the weighted figure that reflects all-day operation, not just an ideal-condition peak
Key specifications (MID 50KTL3-X2)
| Specification | Datasheet value |
|---|---|
| AC nominal power | 50,000 W |
| Max. AC apparent power | 55,500 VA |
| Max. output current | 84.1 A |
| No. of MPP trackers / PV strings per MPP tracker | 4 ตัว / 2 สตริงต่อ MPPT (รวม 8 สตริง) |
| MPPT voltage range | 200V–1000V (แรงดันเริ่มทำงาน 200 V, แรงดันปกติ 600 V) |
| Max. DC voltage | 1,100 V |
| Max. recommended PV power (for module STC) | 75,000 W |
| Max. input current / short-circuit current per MPP tracker | 32 A (Isc สูงสุด 40 A) |
| Max. efficiency | 98.8% |
| European efficiency | 98.5% (MPPT efficiency 99.9%) |
| AC grid connection type | 3 เฟส 3W+N+PE, 220V/380V หรือ 230V/400V (340–440V), 50/60 Hz |
| Protection degree | IP66 (ระบายความร้อนแบบ Smart air cooling) |
| Operating temperature range | −25°C ถึง +60°C |
| Protection devices | SPD Type II ทั้งฝั่ง DC และ AC, DC switch, AFCI, String monitoring, Anti-islanding, RCMU |
| Dimensions (W/H/D) / Weight | 580 / 435 / 230 มม. / 38 กก. |
| Warranty | 5 ปี (มาตรฐาน) ขยายเป็น 10 ปีได้เป็นตัวเลือกเสริม |
Note: every figure above comes straight from the Shenzhen Growatt New Energy Co., Ltd. datasheet. Actual system design (strings per MPPT, cable sizing, breakers) must be calculated for each site.
Why this model suits Phuket
- Hotels and resorts consume heavily by day: aircon and refrigeration loads coincide with production, so a 50 kW system is almost entirely self-consumed
- Frequent lightning in the rainy season: integrated Type II SPDs on both sides are a necessary first layer for Phuket buildings; we add site-appropriate earthing on top
- Multi-span factory and warehouse roofs: four trackers let the array follow the roof as built rather than forcing a single orientation
- Humidity and salt air: IP66 copes well outdoors, but on coastal sites we still choose mounting positions sheltered from direct salt spray
Who it suits
- Hotels and resorts of 40–100 rooms: daytime aircon and kitchen loads comfortably absorb a 50–75 kWp array
- Mid-sized factories and warehouses: long metal-sheet roofs offer area, and production loads sit squarely in daylight hours
- Office buildings and retail: three-phase supply with monthly bills in the tens of thousands to low hundreds of thousands of baht
- Villa clusters on a shared meter: one central system instead of small inverters on every house
- Projects needing string-level visibility: owners who want to see which group of panels is underperforming, not just a single system total
Summary
The Growatt MID 50KTL3-X2 is a 50 kW three-phase on-grid inverter that fits Phuket's commercial work well — hotels, mid-sized factories and commercial buildings with heavy daytime consumption. Four MPPTs across eight strings handle multi-plane roofs, PV input reaches 75,000 W, and integrated AFCI plus dual-side Type II SPDs cut down external switchgear while making the system easier to maintain.
See other models from this brand on the Growatt overview, or browse all the equipment we install.
Download the datasheet (PDF) — full manufacturer specification sheet