The Solis S6-EH3P15K-H is a 15kW three-phase high voltage hybrid inverter, built for larger residential and light commercial solar-plus-storage systems. With a recommended max. PV array size of 30kW, a wide 120-800V battery voltage range, and a dedicated generator input, it's engineered for high-power PV modules of any brand alongside intelligent dual backup port management, making it a strong fit for demanding three-phase installations.
120-800V
Battery Voltage Range
Installer note — grid compliance & high voltage battery: This inverter is certified to G99 under the manufacturer's listed grid connection standards. Battery voltage operates up to 800V, so installation, isolation, and commissioning must strictly follow the manufacturer's high-voltage safety procedures. Confirm DNO notification requirements and use an MCS-accredited installer before commissioning.
Backup overload rating on this model: The manufacturer's datasheet rates backup output at 2 times rated power for 10 seconds on the 15K model, which differs from the 20K model in the same range (rated at 1.6 times for 10 seconds). Confirm the correct surge rating for the specific model being quoted.
Battery compatibility: Compatible with Li-ion battery systems operating within the 120-800V range. Always confirm compatibility against the current Solis approved battery list before specifying a system, given the high voltage architecture of this platform.
High-Current PV Input
A maximum input current of 20A per MPPT across four independent trackers makes this inverter compatible with all high-power PV modules regardless of brand, supporting a recommended array size of up to 30kW without derating.
Dual Backup Port Load Management
Two independently controlled backup ports allow intelligent separation of critical and non-critical loads, so essential circuits stay powered during an outage while less critical circuits can be shed to conserve battery capacity.
Generator Compatibility with Reverse Current Protection
Built-in AC voltage detection of both grid and generator output prevents reverse current from the grid from damaging a connected generator, extending safe backup duration during prolonged power outages.
Peak Shaving in Self-Use & Generator Modes
Supports peak shaving functionality in both self-use and generator operating modes, helping to manage demand charges and smooth load spikes for larger properties with variable consumption patterns.
Unbalanced & Half-Wave Load Support
The inverter supports unbalanced and half-wave loads on both the grid and backup port, allowing single-phase loads to be served flexibly from a three-phase supply without dedicated balancing equipment.
SG Heat Pump Compatibility
Native SG-ready heat pump compatibility allows the inverter to coordinate directly with compatible heat pump systems, using surplus solar generation to drive space and water heating more efficiently.
Input DC (PV Side)
| Recommended max. PV array size |
30 kW |
| Max. usable PV input power |
24 kW |
| Max. input voltage |
1000 V |
| Rated voltage |
600 V |
| Start-up voltage |
160 V |
| MPPT voltage range |
200-850 V |
| Max. input current |
4 x 20 A |
| Max. short circuit current |
4 x 30 A |
| MPPT number / max. input strings number |
4 / 4 |
Battery
| Battery type |
Li-ion |
| Battery voltage range |
120-800 V |
| Max. charge / discharge power |
15 kW |
| Max. charge / discharge current |
50 A |
| Communication |
CAN / RS485 |
Output AC (Grid Side)
| Rated output power |
15 kW |
| Max. apparent output power |
15 kVA |
| Rated grid voltage |
3/N/PE, 220 V / 380 V, 230 V / 400 V |
| Rated grid frequency |
50 Hz / 60 Hz |
| Rated / max. output current |
22.8 A / 21.7 A |
| Power factor |
>0.99 (0.8 leading – 0.8 lagging) |
| THDi |
<3% |
Input AC (Grid Side)
| Input voltage range |
304-437 V / 320-460 V |
| Max. input current |
34.2 A / 32.5 A |
| Rated grid frequency |
50 Hz / 60 Hz |
| Frequency range |
45-55 Hz / 55-65 Hz |
Input Generator
| Max. input power |
15 kW |
| Max. input current |
22.8 A / 21.7 A |
| Rated input frequency |
50 Hz / 60 Hz |
Output AC (Backup)
| Rated output power |
15 kW |
| Max. apparent output power |
2x rated power, 10 s |
| Back-up switch 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 |
| THDv (@linear load) |
<3% |
Efficiency
| Max. efficiency |
97.7% |
| EU efficiency |
97.5% |
| Battery charged by PV max. efficiency |
98.5% |
| Battery charged/discharged to AC max. efficiency |
97.2% |
Protection
| Anti-islanding protection |
Yes |
| Output over current protection |
Yes |
| Short circuit protection |
Yes |
| Integrated AFCI 2.0 |
Optional |
| Integrated DC switch |
Yes |
| DC reverse-polarity protection |
Yes |
| PV over voltage protection |
Yes |
| Battery reverse protection |
Yes |
General Data
| Max. allowable phase imbalance (grid & backup) |
100% |
| Max. power per phase (grid & backup) |
50% rated power |
| Dimensions (W x H x D) |
563 x 546 x 250 mm |
| Weight |
35.2 kg |
| Topology |
Transformerless |
| Self-consumption (night) |
<25 W |
| Operating ambient temperature range |
-25°C to +60°C |
| Relative humidity |
0-95% |
| Ingress protection |
IP66 |
| Noise emission (typical) |
<65 dB(A) |
| Cooling concept |
Intelligent fan-cooling |
| Max. operation altitude |
2000 m |
Connections & Compliance
| PV connection |
MC4 connector |
| Battery connection |
OT terminal |
| AC connection |
OT terminal |
| Display |
7.0" LCD display + Bluetooth + App |
| Communication |
CAN, RS485, Ethernet; optional Wi-Fi, Cellular, LAN |
| Safety / EMC standard |
IEC/EN 62109-1/-2, IEC/EN 61000-6-1/-2/-3/-4 |
| 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 |
Frequently Asked Questions
What size PV array can be connected to this inverter?
The inverter supports a recommended maximum PV array size of 30kW across four MPPT inputs, each rated at 20A, making it suitable for high-power PV modules from any manufacturer without derating.
Which batteries are compatible with this inverter?
The inverter operates within a wide 120-800V battery voltage range and is designed for Li-ion battery systems. Always confirm compatibility against the current Solis approved battery list before specifying a system, given the high voltage architecture.
How fast is the backup power switchover?
The manufacturer's datasheet specifies a switchover time of under 10ms, allowing critical loads on the backup ports to continue running through most grid outages with minimal interruption.
Can this inverter be used with a backup generator?
Yes. It includes a dedicated generator input rated at 15kW, with built-in AC voltage detection of both grid and generator output to prevent reverse current from damaging the generator during extended outages.
Can this inverter handle unbalanced loads across the three phases?
Yes. The inverter supports unbalanced and half-wave loads on both the grid and backup port, along with a maximum allowable phase imbalance of 100%, giving flexibility for uneven single-phase loads on a three-phase supply.
Does this inverter support UK grid connection standards?
Yes, the series is certified to G99 under the manufacturer's listed grid connection standards. Installers should confirm current DNO notification requirements based on total system export capacity before commissioning.
