Solis - Installation Guide

4 MPPT - 8 strings up to 21 A and up to 100 kW usable PV power

168A / 84+84A - Maximum charge/discharge

Compatible with leading global battery brands 

Pre-assembled battery cables, energy meter, and data logger included in the box

Remote Monitoring - For clear understanding and analysis

Automatic UPS switching - <10ms

Parallel system - On-grid or off-grid, Max. 6 (10) inverters in parallel

160% overload capacity for 2s - Temporary overload

Operating Logic of Solis Hybrid Inverters with Smart Port

• During a grid outage: The Solis hybrid inverter supplies the backup loads using available energy from the battery and PV system. The available backup duration depends on the battery state of charge, load demand, and system configuration.
• Generator operation: The generator can be used as a secondary power source only when the system is operating in off-grid mode.
• Generator activation: As the battery state of charge (SOC) decreases and reaches the configured minimum SOC, the hybrid inverter activates the generator through the Smart Port. The generator then supplies energy to the backup loads and recharges the battery.
• Generator shutdown: Once the battery SOC reaches the configured target SOC, the hybrid inverter switches off the generator.
• AC-coupled PV inverter: An AC-coupled PV inverter can be used in both on-grid and off-grid modes. It can supply energy to the loads and, where supported by the system configuration, contribute to battery charging.
• Smart Port as a second Backup Port: When configured as a second Backup Port, the Smart Port can supply additional loads in both on-grid and off-grid operation, subject to the applicable system configuration and operating limits.
• The Smart Port is available on S6-EH models equipped with this feature.
• Updating the hybrid inverter to the latest firmware version is recommended before using the Smart Port.

Generator Operating Mode on Solis S6-EH Hybrid Inverters

• The hybrid inverter synchronizes with the generator and operates in grid-following mode when the AC grid is unavailable.
• The hybrid inverter activates the generator when the configured SOC_on threshold in the Smart Port settings is reached.
• During an AC grid outage, the generator supplies power to the backup loads through the Smart Port.
• If the generator produces more power than the backup loads require, the surplus energy can be used to charge the battery.
• The hybrid inverter deactivates the generator when the configured SOC_off threshold is reached.
• When the AC grid is unavailable, the hybrid inverter cannot synchronize with or follow the AC grid. Instead, it synchronizes with the generator frequency when the generator is operating.

Generator Types for Off-Grid Operation

The following generator configurations can be used in off-grid applications, subject to system compatibility:

• Generator with automatic start/stop: The generator is controlled via the dry contact on the Smart Port.
• Generator with manual start/stop: The generator is manually started and stopped and does not require external communication with the inverter.
• Generator with permanent power supply: A generator can provide a permanent power source in systems equipped with an AC grid and an automatic transfer switch (ATS), subject to the applicable system configuration.

Generator Design Rules for S6-EH Hybrid Inverters

• Three-phase compatibility: Only three-phase generators should be connected to the Smart Port of three-phase hybrid inverters.
• Generator power sizing: The maximum generator input power at the Smart Port should be equal to or slightly higher than the hybrid inverter’s rated nominal power.
• Example: For the S6-EH3P50K-H, the maximum recommended generator input power at the Smart Port is 60 kW.
• Generator efficiency: Generator sizing should also take into account the generator’s operating efficiency. Most generators achieve their optimal efficiency at approximately 80% of rated load.

Connection wiring in S6-EH3P(12-20)K-H

S6-EH3P(29.9-60)K-H

NOTE: Generator size: S6-EH50K-H supports range greater than 20K

System with One Generator Supplying Backup Loads

• Follow the applicable design rules for each hybrid inverter and refer to the corresponding inverter installation manual.
• Connect the generator:
  • Connect the generator AC output to the Smart Port – GEN terminals.
  • Install an appropriately rated circuit breaker between each hybrid inverter and the generator to provide protection.
• Connect the backup loads:
  • Connect the critical loads to the Backup Port.
  • Install an appropriately rated circuit breaker between each hybrid inverter and the connected loads to provide protection.

Connection on S6-EH3P(29.9-60)K-H

Installation Procedure for S6-EH3P(29.9–60)K-H

1. Connect the generator: Connect the generator AC output cables to the GEN terminals on the Smart Port.
2. Connect the generator start/stop control: For the generator’s automatic start/stop function, use pins 7 (G) and 8 (V) on the 14-pin communication terminal block.
3. Configure the system: Complete the required settings in SolisCloud. 

Parallel System

Special Case – Parallel System with One Generator Supplying All Backup Loads

• Compatible hybrid inverters: Only hybrid inverters of the same model can be connected in parallel (e.g., 2 × 50 kW, not 50 kW + 30 kW).
• Generator connection: For parallel systems using a single generator, connecting the diesel generator through an Automatic Transfer Switch (ATS) is recommended, subject to the system configuration.
• Generator sizing: The generator AC output power should be equal to or slightly higher than the combined rated AC power of all parallel hybrid inverters.
  Example: For 2 × 50 kW hybrid inverters, a 100 kW generator can be used.
• Connect the generator to the Smart Ports:
  • Connect the GEN terminals of all hybrid inverters to the generator.
  • Install an appropriately rated circuit breaker between each hybrid inverter and the generator for protection.
• Connect the Backup Ports:
  • Connect the Backup Ports of all hybrid inverters to a common backup bus supplying the backup loads.
  • Install appropriately rated circuit breakers between the inverters and the backup/load circuits for protection.
• Parallel configuration: Configure the hybrid inverters as a parallel system using the Master/Slave operating logic.
• Generator start/stop control: Connect the generator's automatic start/stop control to the 14-pin communication terminal of the Master hybrid inverter.
• SolisCloud configuration: Complete the required generator and parallel-system settings in SolisCloud on the Master hybrid inverter, as described in the following sections.

Setup for Smart Port - Generator

SolisCloud Desktop version:

Navigate to Smart Port and activate Genset input

• Gen rated power (AC) = rated output power of generator in Watts
• Mode: Automatic = with communication signal to start and stop
• Mode: Manual = without automatically start and stop
• SOC_on in range of 1% till 95%
• SOC_off in range of 35% till 100%

SolisCloud Overview 

SolisCloud mobile APP:

Navigate to Smart Port → Genset Input and configure the following parameters:

• Gen Rated Power: Enter the rated AC output power of the generator in watts (W).
• Mode:
  • Automatic: The hybrid inverter controls the generator start/stop function through the communication signal.
  • Manual: The generator is started and stopped manually and does not use the inverter's automatic start/stop signal.
• SOC_on: Set the battery state of charge (SOC) threshold at which the generator starts. The configurable range is 1% to 95%.
• SOC_off: Set the battery SOC threshold at which the generator stops. The configurable range is 35% to 100%.

Generator Operating Mode on Solis S6-EH Hybrid Inverters

• The hybrid inverter synchronizes with the generator and operates in grid-following 

Working Mode of AC-Coupled PV Inverter on Solis S6-EH Hybrid Inverters

• PV inverter compatibility: The S6-EH hybrid inverter supports the connection of both Solis grid-tied PV inverters and compatible third-party grid-tied PV inverters.
• AC-coupled operation: The AC-coupled PV inverter synchronizes with the hybrid inverter. During off-grid operation, the hybrid inverter operates in grid-forming mode and establishes the AC voltage and frequency for the AC-coupled PV inverter. AC coupling can be used in both on-grid and off-grid operation.
• PV inverter grid-code settings: The AC-coupled PV inverter must be configured with the same applicable grid code as the hybrid inverter. It must also support the required frequency-response functions, including over-frequency power reduction and under-frequency power increase, where required by the system configuration.

On-Grid Operation

During on-grid operation:

• The AC-coupled PV inverter supplies energy to the loads connected to the hybrid inverter's AC system, including the Grid Port and Backup Port, subject to the system configuration.
• Surplus PV energy can be used to charge the battery.
• If PV generation exceeds the local load and the permitted battery charging power, surplus energy may be exported to the public grid, subject to the applicable export configuration and grid requirements.
• Because the output of an AC-coupled PV inverter cannot necessarily be directly controlled by the hybrid inverter, the hybrid inverter may need to reduce its own PV generation to maintain the required power balance.

Off-Grid Operation

During off-grid operation:

• The hybrid inverter operates in grid-forming mode and establishes the AC grid for the AC-coupled PV inverter.
• Energy generated by the AC-coupled PV inverter can supply the backup loads and charge the battery, subject to the configured system limits and battery SOC.
• The hybrid inverter manages the available energy according to the configured operating logic and battery SOC.
• When PV generation exceeds the instantaneous load demand and permitted battery charging power, the AC-coupled PV inverter must reduce its output through the applicable frequency-control functions.

Power Management

• The hybrid inverter can reduce its own PV output when required to maintain the system power balance.
• The hybrid inverter's AC output remains limited by its rated AC power. Additional available PV energy cannot be used to increase the hybrid inverter's AC output beyond its rated power.
• The AC-coupled PV inverter may continue to generate power according to the available PV energy and its control limits. Therefore, appropriate frequency-response and power-reduction functions are required to prevent excess generation during off-grid operation.
• The actual power available for battery charging depends on the battery charging limits, inverter configuration, load demand, and available PV generation.

Design Rules for AC-Coupled PV Inverters on S6-EH Hybrid Inverters

• Three-phase compatibility: Only three-phase grid-tied PV inverters may be connected to the Smart Port of three-phase S6-EH hybrid inverters.
• PV inverter power rating: The rated AC output power of the AC-coupled PV inverter must be equal to or lower than the rated AC power of the S6-EH hybrid inverter.
• Example: For an S6-EH3P50K-H, the AC-coupled PV inverter connected to the Smart Port must have a rated AC output power of ≤ 50 kW.

Setup for Smart Port - AC Coupled

SolisCloud Desktop version:

Navigate to Smart Port and activate AC Coupled.

• Hybrid inverter: Operates in grid-forming mode; the AC-coupled PV inverter follows the hybrid inverter.
• Max Frequency (Hz): Frequency control of the AC-coupled PV inverter.
  • At the configured maximum frequency, the AC-coupled PV inverter can be derated down to zero output, as the hybrid inverter cannot directly control its power output.
• Export Power & SOC: Used for off-grid operation.
  • The Smart Port relay switches ON/OFF when the configured battery SOC limits are reached.

SolisCloud Overview 

SolisCloud mobile APP:

Navigate to Smart Port → Genset Input and configure the following parameters:

Setup with SolisCloud Mobile App

During the Quick Installation process, the app prompts for Smart Port settings in Point 3. 

Navigate to Genset Input and configure:

• AC Coupled Max. Frequency
• Battery SOC limits for when the Smart Port is used as a power source.

C&I

SolisStorage C&I Energy Storage System

PrimePower Series

S1-109EC3P50K04-NV-YD-H

4 Unique Advantages

1: Long-Term Performance

• High-quality CATL 306 battery cells 
• Extended cycle life of more than 10,000 cycles 
• High cell consistency for stable, reliable long-term operation 

2: Comprehensive Safety Protection 

• Multi-layer protection from the individual cell level to the complete battery cabinet 
• 12-level fire safety protection 
• 24-hour active insulation/leakage detection
• Comprehensive battery pack temperature monitoring 

3: Multiple Application Scenarios

• Supports multiple operating modes. 
• Easily adaptable to 13 application scenarios.

4: Easy Maintenance

• Patented battery pack with IP67 protection, natural cooling, and a fanless design 
• Separate mounting structure for the hybrid inverter, helping to reduce the risk of heat accumulation 
• Maintenance-free combustible-gas sensor with a service life of up to 10 years 
• Supports remote OTA updates via SolisCloud 

Easy Maintenance

Patented IP67-rated battery pack with natural cooling and a fanless design. 

High IP protection ratings: Battery module IP67, cabinet IP55, and inverter IP66 

High corrosion resistance: C4 corrosion protection; C5 available as an optional configuration 

No coolant required: No periodic coolant filling or replacement is required 

Expandable Capabilities

AC-side parallel connection: Supports up to 6 units in parallel, enabling the total system inverter capacity to be expanded up to 300 kW. 

DC-side parallel connection: Supports up to 6 battery cabinets in parallel, enabling the total battery capacity to be expanded up to 654 kWh. 

Up to 6 units in parallel (AC side)

Up to 6 battery cabinets in parallel to a single 50/125 kW inverter.

5 Competitive Advantages

1. Fast on-grid/off-grid transfer: Switches between on-grid and off-grid modes in less than 10 ms, helping to minimize power interruptions. ① 
2. Flexible grid and generator integration: Supports flexible operation in weak-grid and generator (genset) hybrid systems, helping to reduce system investment costs. 
3. Scalable system capacity: Supports system expansion up to 1.25 MW / 15.66 MWh, providing flexibility to meet growing energy demands. ② 
4. AI and VPP readiness: Supports AI integration and Virtual Power Plant (VPP) applications, enabling dynamic tariff optimization, potential electricity cost savings, and additional revenue opportunities. 
5. Remote monitoring and OTA updates: Supports remote system monitoring and over-the-air (OTA) updates via the SolisStorage Cloud platform. 

            ① When multiple inverters operate in parallel, switching time does not exceed 20 ms.

                ② When more than 6 inverters are connected in parallel, the use of a Solis power distribution cabinet is

                   recommended.