New Industry Products

250kW, 1500Vdc String Inverter up to 99% Efficient

May 16, 2019 by Scott McMahan

Sungrow unveiled a 1500Vdc string inverter SG250HX at Intersolar Europe 2019. The 250kW inverter, designed for optimal performance, is now available for pre-sale.

According to Sungrow, the SG250HX is the world's most powerful 1500Vdc string inverter. It features a high capacity of 250kW and comes with the high voltage of 1500Vdc and 800Vac, enabling cost saving on dc and ac cables.

With a maximum efficiency of 99%, the string inverter is compatible with bi-facial modules, offering a higher yield. The system features 12 MPPTs and a flexible block design allowing for up to 6.3MW blocks, making it suitable for hilly utility-scale applications.

An ingress protection level of IP66 and an anti-corrosion grade of C5 make the compact inverter resilient in harsh conditions such as desert and coastal areas.

With smart, forced air-cooling technology, the SG250HX can operate without derating at extremely high temperatures. The system also has fault diagnostic and IV-curve scan functions, simplifying operation and maintenance.

An embedded anti-PID function results in much less module degradation. Also, the improved power line communication will decrease installation cost without requiring excessive communication wiring.

The inverter can connect to storage systems equipped with a storage interface.

"Sungrow is excited to bring forth another disruptive string inverter technology to Europe, maximizing ROI for our customers at unforeseen levels," said Stefan Froboese, Technical Director, Sungrow EMEA.


  • Max. PV input voltage: 1500V
  • Min. PV input voltage / Start-up input voltage: 600V/600V
  • Nominal PV input voltage: 1080V
  • MPP voltage range: 600V to 1500V
  • MPP voltage range for nominal power: 860V to 1300V
  • No. of independent MPP inputs: 12
  • Max. number of PV strings per MPPT: 2
  • Max. PV input current: 26A x 12
  • Max. current for input connector:30A
  • Max. DC short-circuit current: 50A x 12


  • AC output power: 250kVA @ 30℃/225kVA @ 40℃/200kVA @ 50℃
  • Max. AC output current: 180.5A
  • Nominal AC voltage: 3/PE, 800V
  • AC voltage range 680V to 880V
  • Nominal grid frequency/Grid frequency range: 50Hz/45Hz to 55Hz, 60Hz/55Hz to 65Hz
  • THD: <3% (at nominal power)
  • DC current injection: <0.5% In
  • Power factor at nominal power/Ajustable power factor: >0.99/0.8 leading - 0.8 lagging
  • Feed-in phases/connection phases: 3/3


  • Max. efficiency: 99.0%
  • Euro. efficiency: 98.7%


  • DC reverse connection protection
  • AC short circuit protection
  • Leakage current protection Yes Grid monitoring Yes Ground fault monitoring Yes
  • DC switch
  • PV String current monitoring
  • Q at night function
  • PID recovery function
  • Anti-PID or PID recovery
  • Over-voltage protection
  • DC Type II / AC Type II

General Data

  • Dimensions (W*H*D): 1051mm x 660mm x 363mm, Weight 95kg
  • Isolation method: Transformerless
  • Ingress protection rating: IP66
  • Night power consumption: <2W
  • Operating ambient temperature range: -30℃ to 60℃
  • Allowable relative humidity range (non-condensing): 0% to 100 %
  • Cooling method: Smart forced air cooling
  • Max. operating altitude: 4000m (>3000m derating)
  • Display: LED, Bluetooth+APP
  • Communication: RS485/Optional: PLC
  • DC connection type: Amphenol UTX (Max. 6 mm² )
  • AC connection type: OT terminal (Max. 300 mm²)
  • Compliance: IEC 62109, IEC 61727, IEC 62116, IEC 60068, IEC 61683, VDE-AR-N 4110:2018, VDE-AR-N 4120:2018, IEC 61000-6-3, EN 50438, UNE 206007-1:2013, P.O.12.3, UTE C15-712-1:2013,UL1741, UL1741SA, IEEE1547, IEEE1547.1, CSA C22.2 107.1-01-2001, FCC Part15 Sub-part B Class A Limits, California Rule 21
  • Grid Support: Q at night function, LVRT, HVRT, active & reactive power control, and power