High-voltage three-phase
Solis S6-EH3P hybrid inverter (15–20) kW · three-phase · high voltage
Solis S6-EH3P (15–20 kW) is a three-phase high-voltage hybrid inverter from the S6 series for large residential properties and small businesses. It works with batteries rated 150–800 V, features 3–4 MPPT trackers, delivers instant backup power (UPS <10 ms) and supports parallel operation of up to 6 units.
Models
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Overview
The Solis S6-EH3P hybrid inverter (15–20 kW) is a flagship three-phase solution built on High Voltage technology and designed for sites with demanding requirements for power, fast charging and energy efficiency. Rated from 15 to 20 kW, the series targets large residences, private estates, business centres, production areas, warehouses and vehicle service centres with a three-phase supply.
The key advantage of this model over entry-level and low-voltage alternatives is the combination of high rated power with a high-voltage battery bus interface (150–600 V). Transferring energy at higher voltage means substantially lower operating currents on the battery side. This minimises cable heating, reduces the inverter's internal thermal losses, delivers high efficiency and allows peak charge/discharge currents to be absorbed and released instantly — critical for storing energy quickly in a short space of time.
The device provides reliable protection for the site during blackouts. The transfer to battery backup power takes less than 10 ms, keeping servers, data centres, security systems and sensitive automation running without interruption. Thanks to its generous overload headroom and three-phase architecture, the inverter easily handles the inrush currents of heavy industrial and utility equipment — zoned air-conditioning systems, high-capacity heat pumps, compressors, machine tools and ventilation units.
Solis S6-EH3P (15–20)K-H is built for maximum PV array performance. It accepts heavily oversized PV arrays and is compatible with modern high-output PV modules (input current up to 21 A per tracker). The inverter integrates easily with auto-start generator sets, supports intelligent load prioritisation and allows up to 6 units in parallel to build powerful local grids.
Key specifications
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Power range (kW)
15–20
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Grid phases
Three-phase (380 V)
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Number of MPPT trackers
3–4 MPPT
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Battery voltage
High voltage — HV (200 V+)
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Built-in monitoring
Wi-Fi, LAN
Key features
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AI intelligently manages charging and discharging based on multi-band Time-of-Use (TOU) tariffs
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Seamless integration with VPP and EMS platforms to optimise energy consumption
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Built-in heat-pump control with SG Ready functionality Flexibility and scalability
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Compatibility with widely used lithium battery brands
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Easily expand system capacity through parallel connection and AC coupling
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Support for unbalanced three-phase loads with per-phase overload up to 40% of the inverter's rated power
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Support for up to 160% oversizing on the PV side for maximum solar energy harvest
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Switchover time < 10 ms Simple, fast configuration
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The large 7-inch screen uses US-made industrial-grade ZEITLER components
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Bluetooth app support for fast and simple configuration
Technical specifications
Models
SKU: S6-EH3P15K-H
DC input (PV side)
- Recommended max. PV array size
- 30 kW
- Recommended max. PV array size
- 40 kW
- Max. usable PV module input power
- 24 kW
- Max. usable PV module input power
- 32 kW
- Maximum input voltage
- 1000 V
- Rated voltage
- 600 V
- Start-up voltage
- 160 V
- MPPT voltage range
- 200 - 850 V
- Max. input current
- 4 × 20 A
- Max. current at the DC input
- 20 A
- Max. short-circuit current
- 4 × 30 A
- Number of MPPTs / max. inputs per MPPT
- 4 / 4
Battery
- Battery type
- Lithium-ion
- Battery voltage range
- 120 - 800 V
- Maximum charge / discharge current
- 50 A
- Number of battery ports / BMS ports
- 1 / 1
- Communication
- CAN / RS485
AC output (grid side)
- Rated output power
- 15 kW
- Rated output power
- 20 kW
- Max. apparent output power
- 15 kVA
- Max. apparent output power
- 20 kVA
- Rated grid voltage
- 3/N/PE, 220 V / 380 V, 230 V / 400 V
- Rated grid frequency
- 50 Hz / 60 Hz
- Rated grid output current
- 22.8 A / 21.7 A
- Rated grid output current
- 30.4 A / 28.9 A
- Power factor
- > 0.99 (-0.8 to +0.8)
- THDi
- < 3%
AC input (grid side)
- Max. input power
- 22.5 kW
- Max. input power
- 30 kW
- Input voltage range
- 304 - 437 V / 320 - 460 V
- Max. input current
- 34.2 A / 32.5 A
- Max. input current
- 45.6 A / 43.3 A
AC output (backup output)
- Rated output power
- 15 kW
- Rated output power
- 20 kW
- Max. apparent output power
- 1.6× rated power, 10 s
- Backup switchover time
- < 10 ms
- Rated output voltage
- 3/N/PE, 220 V / 380 V, 230 V / 400 V
- Rated frequency
- 50 Hz / 60 Hz
- Rated output current
- 22.8 A / 21.7 A
- Rated output current
- 30.4 A / 28.9 A
- Max. AC pass-through current
- 34.2 A / 32.5 A
- Max. AC pass-through current
- 45.6 A / 43.3 A
- THDv (at linear load)
- < 3%
AC input (generator side)
- Max. input power
- 15 kW
- Max. input power
- 20 kW
- Rated input current
- 22.8 A / 21.7 A
- Rated input current
- 30.4 A / 28.9 A
- Rated input voltage
- 3/N/PE, 220 V / 380 V, 230 V / 400 V
- Rated input frequency
- 50 Hz / 60 Hz
Efficiency
- Maximum efficiency
- 97.7%
- European efficiency
- 97.5%
- Battery charged from PV / AC — maximum efficiency
- 98.5% / 97.2%
- Battery discharge efficiency
- 97.2%
Protection
- Surge protection
- DC type II / AC type II (optional)
- Overcurrent protection
- Yes
- Insulation resistance monitoring
- Yes
- Residual current detection
- Yes
- Built-in PV switch
- Yes
- DC reverse polarity protection
- Yes
- Ingress protection / overvoltage category
- I / II (PV and BAT), III (MAINS, BACKUP and GEN)
- Anti-islanding protection
- Yes
General data
- Maximum power per phase
- 40% of rated power
- Dimensions (W × H × D)
- 563 × 546 × 250 mm
- Weight
- 35.2 kg
- Inverter topology
- Transformerless
- Self-consumption
- < 25 W
- Operating temperature range
- -25 ~ +60°C
- Relative humidity
- 0 - 100%
- Ingress protection (IP)
- IP66
- Noise level (typical)
- < 65 dB(A)
- Cooling method
- Fan with intelligent speed control
- Max. operating altitude
- 2000 m
- Grid connection standard
- EN 50549-1/-10, VDE4105, CEI 0-21, CEI 0-16, NC-RFG TypeB, NRS 097-2-1, LTU-1, G99, PEA
- Safety / EMC standard
- IEC/EN 62109-1/-2, IEC/EN 61000-6-1/-2/-3/-4
Features
- PV connection
- MC4 connector
- Battery connection
- Lever terminal
- AC connection
- OT terminal
- Display
- 7.0" LCD display and Bluetooth + app
- Communication interface
- Standard: Wi-Fi+LAN+Bluetooth, CAN-BMS, CAN-Parallel×2, RS485-Meter, RS485, DRM, DI, DO×3
Documentation and certificates
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DownloadDatasheet
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний.pdf
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DownloadUser manual 1
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_інструкція1.pdf
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Download
User manual 2
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_інструкція2.pdf
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DownloadCertificate 1
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат1.pdf
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Download
Certificate 2
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат2.pdf
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Download
Certificate 3
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат3.pdf
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Download
Certificate 4
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат4.pdf
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Download
Certificate 5
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат5.pdf
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Download
Certificate 6
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат6.pdf
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Download
Certificate 7
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат7.pdf
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Download
Certificate 8
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат8.pdf
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Download
Certificate 9
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат9.pdf
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Download
Certificate 10
Гібридний інвертор Solis S6-EH3P (15–20) кВт · трифазний · високовольтний_сертифікат10.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.