REFUsol 250K-5T
For solar parks with full power even in hot conditions
- AC power
- 250 kW
- MPPTs
- 5
- max. efficiency
- 99.01 %
At a glance
1,500 V
Max. DC voltage
405 kWp
Max. recommended PV power
DC/AC ratio up to 150 %
up to 50 °C
Full AC power
250 kVA at 50 °C
98.52 %
European efficiency
IP66
Protection rating
Corrosion protection C5-M
5 + 5 years
Warranty
5 years standard, extendable by 5 years
Your benefit as …
Operators & investors
Real-time monitoring with REFUview
REFUview shows the status, output and yield of your PV plant in real time, on your computer and on your smartphone. Spot deviations early and protect your yield.
Data hosting in Germany
Your plant data is hosted and processed in Germany. This makes data protection and data sovereignty easier, especially for operators of critical infrastructure.
Technical support from Germany
For questions about operation, faults or firmware updates, you can reach our technical support in Germany, personally and without detours.
EPCs & general contractors
Datasheets, certificates and manuals in the download centre
Datasheets, unit certificates, declarations of conformity and manuals are all in one place in the download centre, always in the current version.
Personal contacts in sales and engineering
For system design, quotations and detailed technical questions, you talk directly to our sales team and our engineers, including for large solar parks.
Scalable with REFUlink and REFUview
REFUlink connects up to 60 inverters to the control room and the grid operator, while REFUview brings all operating data together. The system grows with your plant.
Planners & engineers
Unit certificates and declarations of conformity in the download centre
Download the evidence you need for plant design, such as unit certificates to VDE-AR-N 4105 and 4110 or EN 50549, directly and without a request.
Complete technical data for comparison
Every product page shows all values from the datasheet, from the MPPT voltage range to the overvoltage category, clearly arranged by group.
Direct contact with engineering
For detailed questions on grid protection, reactive power or plant control, talk directly to our engineers, without detours.
Project developers
Grid-compliant operation to European grid codes
REFUsol inverters are certified to EN 50549 and the German VDE application rules. This gives you planning certainty for the grid connection of your PV project.
Monitoring with data hosting in Germany
With REFUview, you keep track of the output and availability of your plants. The data is hosted and processed in Germany.
Complete documents for permits and grid connection
Unit certificates, declarations of conformity and datasheets are ready in the download centre, so the plant certificate and grid connection procedure move ahead quickly.
Utilities & grid operators
Power control via Modbus TCP/IP and DRM
With REFUlink, you apply active and reactive power setpoints via Modbus TCP/IP or the DRM levels 0, 30, 60 and 100 % on all connected inverters.
Grid-compliant operation to grid codes
The inverters meet the requirements of EN 50549 and the German VDE application rules for connection to low- and medium-voltage grids, certified and documented.
Data hosting in Germany
Operating data is hosted and processed in Germany. This supports operators of critical infrastructure with data protection and information security.
Technical data
Datasheet (PDF)DC data
| Max. recommended PV power | 405 kWp |
|---|---|
| Max. input voltage | 1,500 V |
| Rated input voltage | 1,080 V |
| Start-up input voltage | 550 V |
| Operating voltage range | 500–1,500 V |
| MPPT voltage range | 500–1,500 V |
| Number of independent MPPTs | 5 |
|---|---|
| DC inputs per MPPT | 5 |
| Max. current per MPPT | 75 A |
| Max. short-circuit current per MPPT | 113 A |
| DC connection | MC4 |
| Max. DC/AC ratio | 150 % |
AC data
| Rated AC power (active power) | 250 kW |
|---|---|
| Max. AC apparent power | 250 kVA |
| AC power at temperature | 250 kVA at 50 °C |
| Max. output current | 198.5 A |
| Nominal grid voltage | 3P/PE: 800 V |
| Grid voltage range | 640–920 V |
| Nominal grid frequency | 50 / 60 Hz |
|---|---|
| Grid frequency range | 45–55 / 55–65 Hz |
| Active power adjustable range | 0–100 % |
| Total harmonic distortion (THDi) | < 3 % |
| Power factor adjustable range | 1 (0.8 inductive … 0.8 capacitive) |
| AC connection | OT / DT Terminal (max. 500 mm²) |
Efficiency
| Max. efficiency | 99.01 % |
|---|
| European efficiency | 98.52 % |
|---|
Protection
| DC switch | integrated |
|---|---|
| String monitoring | Yes |
| Safety protection | Anti-islanding, DC reverse polarity protection, Ground fault monitoring, PV string fault monitoring, Residual current monitoring (RCMU), Overtemperature protection, Overvoltage protection, Overcurrent protection, Terminal temperature monitoring (AC/DC) |
| Protection class | I |
| Overvoltage category DC | II |
| Overvoltage category AC | III |
| Surge protection DC | Type II |
|---|---|
| Surge protection AC | Type II |
| AFCI (arc fault detection) | Yes (IEC 63027) |
| PID recovery | Optional |
| IV curve scan | Yes |
Communication
| RS485 | Yes |
|---|---|
| USB | Yes |
| PLC | Yes |
|---|---|
| Protocols | Modbus, RBUS |
General data
| Min. ambient temperature | −30 °C |
|---|---|
| Max. ambient temperature | 60 °C |
| Night-time self-consumption | < 5 W |
| Topology | transformerless |
| Protection rating | IP66 |
| Corrosion protection class | C5-M |
| Permissible humidity range | 0–100 % |
| Max. operating altitude | 5,000 m |
|---|---|
| Derating from altitude | 4,000 m |
| Weight | 116 kg |
| Cooling | Smart air cooling |
| Display and operation | LED |
| Dimensions (H × W × D) | 760 × 1,158 × 382 mm |
| Warranty | 5 years, extended warranty option for a further 5 years available |
Item no. 890P250Data as of: 28 September 2026WEEE-Reg.-Nr. DE35952985Subject to technical changes
Discuss your project
Which model suits your solar park? We advise you personally, directly with our engineers.
Or directly+49 7121 145 1888info@refu.com
Request a project