Deye SUN-50K-G04 — 50 kW Three-Phase On-Grid Inverter, 4 MPPT, 98.7% Peak Efficiency

The Deye SUN-50K-G04 is a 50 kW three-phase grid-tied inverter for projects with one clear objective: cut the daytime electricity bill as hard as possible, without batteries and without backup circuits. Its real advantages are 98.7% peak and 98.1% Euro efficiency — higher than a hybrid of the same size — and a 39 kg body that makes installation on a factory or commercial roof dramatically simpler. It is one of the units our engineers specify for businesses whose consumption peaks during daylight hours. If you are still sizing the project, start with the calculator and look at the equipment we build systems around.

What is the Deye SUN-50K-G04, and how does it differ from a hybrid?

The SUN-50K-G04 is a three-phase string inverter with a single job: convert DC from the array into AC that offsets what the building would otherwise buy from PEA. There is no battery circuit, and when the grid goes down the inverter stops exporting as grid-connection safety standards require. Removing the charging and transfer circuitry that a hybrid must carry buys two measurable advantages. First, efficiency: 98.7% peak and 98.1% Euro, higher than a hybrid of comparable capacity. Second, mass: 39 kg in a 434×570×243 mm cabinet, which cuts lifting effort and removes most wall-structure constraints. On the DC side, four MPPT trackers take three strings each (3+3+3+3) with a 200–1,000 V tracking window and 1,100 V maximum PV input — a range that permits long strings, reducing home-run cabling and balance-of-system cost on large roofs. Maximum operating PV current of 40+40+40+40 A leaves room for current-dense modern modules without shortening strings to dodge a current ceiling. The unit also supports zero export for sites that must not feed power back to the grid. For a wider view of our work, see services and the solar cost in Phuket page.

Highlights from the datasheet

• 98.7% peak and 98.1% Euro efficiency: the Euro figure reflects real all-day operation and matters far more to annual yield than a brief peak reading.
• Four MPPTs, 3+3+3+3 strings: twelve strings on a single inverter, ideal for factory and commercial roofs split across several areas, with shaded groups isolated from the rest.
• 200–1,000 V MPPT window, 1,100 V max PV: long strings are practical, which means fewer home runs and less balance-of-system cost on large arrays.
• 65 kW of PV on a 50 kW inverter: deliberate oversizing keeps production strong through early mornings, late afternoons and overcast monsoon days.
• 40+40+40+40 A maximum PV current: current-dense modern panels fit without trimming string length purely to stay under a current limit.
• Only 39 kg: in a 434×570×243 mm cabinet, far easier to lift and mount than a hybrid of the same capacity — less installation time and less site risk.
• IP65 with zero export support: suitable for outdoor mounting and configurable to prevent any reverse feed where site conditions require it.

Key specifications (SUN-50K-G04)

Note: every figure above comes straight from the Ningbo Deye Inverter Technology Co., Ltd. datasheet. Actual system design (strings per MPPT, cable sizing, breakers) must be calculated for each site.

Why this model suits Phuket

• Businesses that consume during daylight: hotels, offices, retail and factories in Phuket peak exactly when the sun does, so a grid-tied system offsets consumption immediately without battery investment.
• Heat and derating: the datasheet gives an operating range of -25 to +60°C with derating above 45°C, so a shaded, ventilated mounting position measurably affects year-round output.
• Coastal conditions: the IP65 rating supports outdoor installation, but on seafront sites we still position equipment away from direct salt spray.
• PEA connection conditions: sites that must not export to the grid can use the zero export function, a common requirement on commercial connections in Thailand.

Who it suits

• Factories and warehouses: wide roofs, daytime operation, and a straightforward goal of maximum bill reduction per baht invested.
• Hotels and resorts on daytime load: properties not yet ready to invest in storage but wanting to start reducing energy cost now.
• Offices and retail: air-conditioning and lighting that follow business hours line up almost perfectly with the solar production curve.
• Sites with an existing standby generator: buildings that already have backup power do not need to buy that capability twice through the inverter.
• Owners planning phased expansion: grid-tied systems scale by adding inverters and arrays in later phases without disturbing the original installation.

Summary

The Deye SUN-50K-G04 is the straightforward choice when the goal is purely daytime bill reduction: 50 kW output, 65 kW of PV across four MPPTs, 98.7% peak efficiency, and a 39 kg body that installs faster and more safely than a comparable hybrid. Pearl Solar Energy's engineers and technicians handle design, installation and PEA permits from start to finish. Review our services, or contact us with twelve months of electricity bills and we will model the array size that pays back fastest on your site.

See other models from this brand on the Deye overview, or browse all the equipment we install.

Download the datasheet (PDF) — full manufacturer specification sheet