MV substations
Solis 6300 kW MV substation for 255K inverters
Solis-6300-MV is a complete 6300 kW medium-voltage (MV) transformer substation designed specifically to aggregate and connect arrays of Solis 255K grid-tied inverters to medium-voltage distribution networks at industrial and utility-scale solar power plants.
Models
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Overview
Solis-6300-MV is a block-modular engineered solution (skid- or container-mounted) created to optimise the topology and grid connection of large-scale photovoltaic plants. The substation is optimised for Solis high-efficiency 255 kW string inverters (Solis-255K-EHV-5G), collecting power from a group of inverters and stepping it up to medium voltage (10, 20 or 35 kV).
The solution integrates a 6300 kVA oil-immersed or dry-type power transformer, a complete low-voltage (LV) switchgear assembly with protection devices, a complete medium-voltage (MV) cubicle with a load-break/vacuum circuit breaker, plus auxiliary power, monitoring and dispatch systems.
The marine/outdoor-grade enclosure protects the equipment from extreme weather, while the factory-assembled "Plug and Play" skid design minimises on-site construction and installation costs, shortens the commissioning time of the solar power plant and delivers maximum reliability when exporting electricity to the grid.
Key specifications
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Application
Industrial sites / utility-scale PV
Key features
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Optimised compatibility with Solis 255K inverter arrays for building large utility-scale solar power plants
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High rated power of 6300 kVA to optimise the number of substations across the generation field
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Factory-ready Plug and Play solution for fast installation and lower civil works costs
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Integrated high-efficiency power transformer with low no-load losses
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Comprehensive low- and medium-voltage protection using dependable switchgear
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All-weather rugged enclosure for stable operation in harsh climates
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Built-in local and remote monitoring for compatibility with industrial SCADA systems
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Maximum servicing safety through separation of the LV, MV and transformer compartments
Technical specifications
Models
SKU: Solis-6300-MV Solis-6300-MV
General data
- Low-voltage panel — moulded case circuit breaker (MCCB) specification
- 250 A / 800 Vac / 3P, 14 × 2 pcs
- Connection arrangement with the transformer
- Copper busbar
- Transformer — transformer type
- Oil-immersed
- Rated output power
- 6300 kVA @ 40°C
- Max. apparent output power
- 6930 kVA @ 40°C 3h
- Low / medium voltage
- 0.8 kV / 10 - 35 kV
- Max. input current
- 2577 A × 2
- High-voltage switch
- ±2 × 2.5%
- Transformer vector group
- Dy11y11
- Frequency
- 50 Hz / 60 Hz
- Cooling method
- ONAN
- Resistance
- 8% (± 10%)
- Oil type
- Mineral oil (optional: vegetable oil)
- Winding material
- Al / Al (optional: Cu / Cu)
- Insulation class
- A
- Connection arrangement with the medium-voltage switchgear
- Cable
- Medium-voltage switchgear — insulation type
- SF6 (optional: SF6-free)
- Rated voltage
- 12 - 40.5 kV
- Rated current
- 630 A
- Internal arc fault
- 20 kA / 1 s
- Number of power supplies
- 3 feeders
- Dimensions (W × H × D)
- 6058 × 2896 × 2438 mm
- Approximate weight
- 21 T
- Ambient operating temperature range
- -25 ~ +60°C
- Max. operating altitude
- 2000 m
- Auxiliary power supply
- 5 kVA / 230 V (optional: maximum 50 kVA)
- UPS
- 1 kVA 30 min (optional: maximum 2 kVA 2 h)
- Ingress protection (IP)
- IP54
- Anti-corrosion class
- C4-H (optional: C5-M)
- Permissible relative humidity range
- 0 - 95%
- Communication
- RS485, Ethernet, Optical fiber
- Standards compliance
- IEC 60076, IEC 62271, IEC61439
Protection
- Overvoltage protection (low voltage)
- AC type I + II
- AC input protection
- Circuit breaker
- Transformer protection
- Oil temperature, oil level, oil pressure
- Fire protection
- Smoke detection, emergency lighting
Related products
Documentation and certificates
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DownloadDatasheet
MV-підстанція Solis 6300 кВт для інверторів 255K.pdf
Frequently asked questions
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Start from the site's average daily consumption and the peak load the inverter has to carry in off-grid mode. The power range of each modification and the recommended PV array size for it are listed in the product card under "Key specifications" — for a precise selection, contact a Solis dealer or use the form below.
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The list of validated batteries is published on the product page — in the compatible-equipment section, where one has already been compiled for that model. The voltage range (LV or HV, depending on the series) is stated in the technical specifications either way. If there is no list, or the battery you need is not on it, contact the Solis Ukraine technical department — compatibility should be confirmed separately.
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Most Solis hybrid and off-grid inverters support connecting a generator with automatic start-up when the battery is discharged. Whether a specific model has this function, and how it is wired, is stated under "Key features" and in the "Technical specifications" table of the product card.
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It depends on the series: single-phase models are designed for a 220 V grid, three-phase models for 380/400 V. The exact connection type for a given product is stated in the "Grid phases" card under "Key specifications".
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Solis equipment carries the manufacturer's warranty, which in Ukraine is administered by official dealers and authorised service centres. The exact term and conditions are stated on the warranty card and on the device's rating plate — for registration and the claim procedure, see the Support section.
Didn't find your answer?
The Solis Ukraine technical department advises on equipment compatibility, wiring diagrams and system configuration.