What is the SG50CX-P2?
- AC output: 50 kW rated at 415 V (at 50 degrees Celsius), 55 kVA max apparent power, 83.6 A max output current
- PV input: 70 kWp recommended maximum per unit, 1100 V max PV voltage, 160 V - 1000 V MPPT range
- Trackers: 4 independent MPPTs, 2 strings each, 8 strings total, 30 A per input (120 A combined)
- Efficiency: 98.5% maximum, 98.3% European weighted
- Build and warranty: IP66 with C5 corrosion grade, -30 to 60 degrees Celsius operating range, 41 kg, 5-year standard warranty extendable to 25 years
The Sungrow SG50CX-P2 is a 50 kW three-phase on-grid string inverter aimed at mid-size commercial systems — hotels, resorts, factories and office buildings — and it accepts up to 70 kWp of panels per unit. Rather than reprinting the datasheet, this page explains what each number actually means when the unit goes on your roof in a hot, salty, humid climate. Pearl Solar Energy's engineers and technicians specify this model when designing mid-size commercial arrays, and we handle the PEA permits as part of the scope. You can compare it against other units on our equipment page.
What is the Sungrow SG50CX-P2, and how does it differ from other models?
The SG50CX-P2 is a pure on-grid string inverter, meaning it converts DC from your panels into three-phase AC and feeds the building — it has no battery input and cannot keep your lights on during a grid outage. Its output is 3/N/PE at 220/380 V or 230/400 V, which matches the three-phase supply found in most Phuket commercial buildings, with an operating window of 312-480 V at 50/60 Hz. The feature that separates it from smaller units is four fully independent MPPTs, two strings each, for a total of eight strings — so roof faces pointing in different directions, or sections shaded at different times of day, can be tracked separately instead of dragging the whole array down to the weakest string. The -P2 suffix matters: it is the current-generation platform, and the older SG50CX code without -P2 has a completely different set of numbers for tracker count, efficiency, weight and cabinet size. Never mix figures from the two. One detail buried in the datasheet that changes your string design: the full 50 kW rating requires PV input voltage above 630 VDC, so if your strings are too short the unit will run but will not reach nameplate output. If you are still deciding between grid-tied and battery-backed, our hybrid with battery backup page covers the trade-offs.
Highlights from the datasheet
- Four independent MPPTs at 30 A each: Handles today's high-current panels directly, and lets a complex roof be split into up to four separately optimised zones — genuinely useful on hotel blocks with several roof planes.
- Up to 70 kWp of panels on a 50 kW output: Deliberate oversizing means the system still produces strongly in early morning, late afternoon and on the overcast days that are common on the Andaman coast.
- Wide 160 V - 1000 V MPPT window, 200 V startup: The array wakes up early and keeps tracking in weak light, but strings must be designed above 630 VDC if you want the full 50 kW.
- 98.5% peak and 98.3% European efficiency: The European figure is the one worth comparing between brands — it reflects a realistic mix of load conditions across a full day rather than a single best-case point.
- IP66 enclosure with C5 corrosion grade: C5 is the high end of the corrosion-protection scale and is what you want in a coastal, humid environment rather than a standard outdoor rating.
- Full protection package: DC Type I+II and AC Type II surge protection, AFCI arc-fault detection, PID recovery, integrated DC switch, residual current detection and per-string current monitoring so a failing string is spotted early.
- 41 kg in a 645 x 575 x 245 mm cabinet: Compact for a 50 kW unit, but still a two-person lift onto properly rated wall anchors.
Key specifications (SG50CX-P2)
| Specification | Datasheet value |
|---|---|
| Rated AC output power | 50 kW (ที่ 415 V, 50 องศาเซลเซียส) — ต้องมีแรงดัน PV ขาเข้าเกิน 630 VDC |
| Max. AC output apparent power | 55 kVA (ที่ 415 V, 40 องศาเซลเซียส) |
| Max. AC output current | 83.6 A |
| Rated AC voltage / feed-in phases | 3 / N / PE, 220/380 V, 230/400 V — 3 เฟส (3-N-PE) ช่วงแรงดัน 312-480 V, 50/60 Hz |
| Recommended max. PV input power | 70 kWp |
| Max. PV input voltage | 1100 V |
| MPP voltage range | 160 V - 1000 V (แรงดัน PV พิกัด 600 V, แรงดันเริ่มทำงาน 200 V) |
| No. of independent MPP inputs / strings per MPPT | 4 ชุด, 2 สตริงต่อ MPPT (รวมสูงสุด 8 สตริง) |
| Max. PV input current | 120 A (30 A x 4) — กระแสลัดวงจร DC สูงสุด 160 A (40 A x 4) |
| Max. efficiency / European efficiency | 98.5% / 98.3% |
| Degree of protection / corrosion grade | IP66, เกรดกันกัดกร่อน C5 |
| Operating ambient temperature range | -30 องศาเซลเซียส ถึง 60 องศาเซลเซียส (ระบายความร้อนด้วยพัดลมอัจฉริยะ) |
| Dimensions (W*H*D) | 645 mm x 575 mm x 245 mm |
| Weight | 41 kg |
| Protection | DC Type I+II SPD / AC Type II SPD, AFCI, PID recovery, DC switch, ตรวจจับกระแสรั่ว, ตรวจสอบกระแสรายสตริง |
| Warranty | 5 ปีมาตรฐาน (เงื่อนไข APAC สำหรับ String Inverter ไม่เกิน 6 ปีนับจากวันผลิต) ซื้อขยายได้รวมสูงสุด 25 ปี |
Note: every figure above comes straight from the Sungrow Power Supply Co., Ltd. (阳光电源股份有限公司) datasheet. Actual system design (strings per MPPT, cable sizing, breakers) must be calculated for each site.
Why this model suits Phuket
- Salt air and humidity: The IP66 enclosure with C5 corrosion grade is the specification level we treat as the baseline for island work. Note that the manufacturer's warranty carries extra conditions for installations close to the shoreline, so we confirm the mounting location before quoting.
- Year-round heat: The unit is rated from -30 to 60 degrees Celsius, and the headline 50 kW figure is measured at 50 degrees Celsius — close to real plant-room conditions on a Phuket rooftop in the afternoon. Smart fan cooling keeps it in range.
- Daytime load matches daytime sun: Hotels, resorts and factories here draw hardest during the day from air conditioning and pumps, exactly when the array peaks. Run a first estimate on our calculator.
- Three-phase supply: Commercial premises in the PEA service area are almost always three-phase, matching this inverter's 3/N/PE output at 220/380 V or 230/400 V.
Who it suits
- Hotels and resorts: Buildings with heavy daytime air conditioning, lift, pump and kitchen loads, typically sized around 50-70 kWp per inverter.
- Factories and warehouses: Large uninterrupted roof areas where multiple units run in parallel, with enough trackers to split several roof planes cleanly.
- Office buildings and large restaurants: Premises on a three-phase meter whose main goal is cutting the daytime peak of the electricity bill.
- Multi-villa developments: Projects on a shared or common-area meter that prefer one larger inverter over several small ones. See our services for scope.
- Not the right fit for: Single-phase homes, systems well under the tens-of-kilowatt range, or anyone who needs backup power during an outage — this is a grid-tied-only unit with no battery input.
Summary
The Sungrow SG50CX-P2 earns its place on mid-size commercial roofs through four independent 30 A MPPTs, 70 kWp of PV headroom on a 50 kW output, and an IP66 C5 enclosure suited to humid coastal air. The points to settle before ordering are the 5-year standard warranty (extendable to 25 years), the additional conditions that apply near the shoreline, and obtaining the Thailand-market datasheet from the distributor to confirm the supported grid codes. For an idea of what a system of this size involves, see solar cost in Phuket, or contact us and we will size the strings for your actual roof.
See other models from this brand on the Sungrow overview, or browse all the equipment we install.
Download the datasheet (PDF) — full manufacturer specification sheet