User Manual for 4G Series Grid Inverter

Important Notes

WARNING: Product specifications are subject to change without notice. Every attempt has been made to make this document complete, accurate, and up-to-date. Individuals reviewing this document and installers or service personnel are cautioned, however, that Solis reserves the right to make changes without notice and shall not be responsible for any damages, including indirect, incidental, or consequential damages caused by reliance on the material presented, including but not limited to omissions, typographical errors, arithmetical errors, or listing errors in the material provided in this document.

Solis accepts no liability for customers' failure to comply with the instructions for correct installation and will not be held responsible for upstream or downstream systems Solis equipment has supplied. The customer is fully liable for any modifications made to the system; therefore, any hardware or software modification, manipulation, or alteration not expressly approved by the manufacturer shall result in the immediate cancellation of the warranty.

Given the countless possible system configurations and installation environments, it is essential to verify adherence to the following: sufficient space suitable for housing the equipment, airborne noise produced depending on the environment, and potential flammability hazards.

Solis will not be held liable for defects or malfunctions arising from:

• Improper use of the equipment.
• Deterioration resulting from transportation or particular environmental conditions.
• Performing maintenance incorrectly or not at all.
• Tampering or unsafe repairs.
• Use or installation by unqualified persons.

WARNING: This product contains lethal voltages and should be installed by qualified electrical or service personnel having experience with lethal voltages.

1. Introduction

1.1 Product Description

Solis single-phase US series inverters invert the DC power from (PV) solar modules into AC power, which can support home loads and feed back to the grid. This product manual is valid for the below listed Solis inverters:

• Solis-1P6K-4G-US
• Solis-1P7.6K-4G-US
• Solis-1P10K-4G-US

1.1.1 Front View of the Inverter

The front panel of the inverter features LED lights, an LCD display, four buttons (keypad), and a wiring box. The components within the wiring box may vary based on the MLRSD transmitter choice.

1.1.2 Bottom and Side View

The bottom view shows the DC Switch, COM, Meter, DC input, and RS485 ports. The side view (right) and back view (left) illustrate other connection points.

1.2 Inverter Knockouts

The inverter is equipped with knockouts at the bottom, back, and sides of the wiring box for cable entry. Adding additional knockouts will void the inverter warranty. The following table details the knockout quantity and size:

1.3 Wiring Box Interior View

The interior of the wiring box contains internal DC wiring, an optional Tigo Core (PLC Signal Inducer), internal AC wiring, DC wiring terminals, AC wiring terminals, internal meter wiring, a grounding terminal, internal COM wiring, and an optional Tigo Transmitter. The specific RSD Transmitter device may vary.

1.4 Packaging

Upon receiving the inverter, inspect for any visible damage. The package should include:

• Inverter x1
• Mounting bracket x1
• Locking screws x1
• Expansion screws x3
• Manual x1

In case of damage or missing components, contact the Solis US Service team at ussales@solisinverters.com.

1.5 Tools Required for Installation

The following tools are required for installation:

• Technician Screwdriver
• Phillips Screwdriver
• Wire Strippers (12AWG to 6AWG)
• Wire Strippers (20AWG to 10AWG)
• Torque Wrench Screwdriver
• Channel Locks
• Multimeter (AC/DC amps)
• Drill and Impact Driver
• Smart Phone

1.6 Storage

If the inverter is not installed immediately, follow these storage instructions:

• Use the original packing box with the desiccant inside.
• Store in a clean, dry, dust-free place.
• Storage temperature: -13°F to 176°F (-25°C to 80°C).
• Humidity: 0% to 95%, non-condensing.
• Do not stack more than four (4) inverters high on a single pallet.
• Keep boxes away from corrosive materials.
• Inspect packaging regularly. Repackage if damaged.
• Store on a flat, hard surface, not inclined or upside down.
• After 100 days of storage, inspect for physical damage before installation.
• If stored for more than 1 year, have it inspected and tested by qualified personnel.
• Restarting after long non-use requires inspection and potential cleaning of internal components.

SAVE THESE INSTRUCTIONS

2. Safety Instructions

2.1 Safety Symbols

The following safety symbols are used in this manual:

• WARNING: Indicates important safety instructions that, if not correctly followed, could result in serious injury or death.
• NOTE: Indicates important safety instructions that, if not correctly followed, could result in equipment or property damage.
• CAUTION: RISK OF ELECTRIC SHOCK: Indicates safety instructions that, if not correctly followed, could result in electric shock.
• CAUTION, HOT SURFACE: Indicates safety instructions that, if not correctly followed, could result in burns.

2.2 General Safety Instructions

• WARNING: Do not connect PV array positive (+) or negative (-) to ground, as it may cause serious damage to the inverter.
• WARNING: Electrical installations must be done in accordance with local and national electrical safety standards.
• WARNING: To reduce the risk of fire, over-current protective devices (OCPD) are required for circuits connected to the Inverter. The DC OCPD shall be installed per local requirements. All photovoltaic source and output circuit conductors shall have disconnects that comply with the NEC Article 690, Part II. All Solis single-phase inverters feature an integrated DC switch.
• CAUTION: Risk of electric shock. Do not remove the cover. There are no user-serviceable parts inside. Refer servicing to qualified and accredited service technicians.
• CAUTION: The PV array (solar panels) supplies a DC voltage when exposed to sunlight.
• CAUTION: Risk of electric shock from energy stored in capacitors of the inverter. Do not remove the cover for 5 minutes after disconnecting all power sources (service technician only). Warranty may be voided if the cover is removed without authorization.
• CAUTION: The surface temperature of the inverter can reach up to 75°C (167°F). To avoid risk of burns, do not touch the surface of the inverter while it is operating. The inverter must be installed in a place inaccessible to children.

2.3 Notice For Use

The inverter has been constructed according to applicable safety and technical guidelines. Use the inverter ONLY in installations that meet the following specifications:

1. Permanent installation is required.
2. The electrical installation must meet all applicable regulations and standards.
3. The inverter must be installed according to the instructions stated in this manual.
4. The inverter must be installed according to the correct technical specifications.

2.4 Notice for Disposal

This product shall not be disposed of with household waste. It must be segregated and brought to an appropriate disposal facility to ensure proper recycling, thereby avoiding negative impacts on the environment and human health. Local waste management rules shall be observed and respected.

3. Overview

3.1 Front Panel Display

The front panel display shows inverter operation status and data. (Refer to Figure 3.1 for visual representation).

3.2 LED Status Indicator Lights

Three LED status indicator lights are on the front panel:

• POWER LED (red): Indicates the power status.
• OPERATION LED (green): Indicates the operation status.
• ALARM LED (yellow): Indicates the alarm status.

Status Indicator Lights:

3.3 Keypad

Four keys are located on the front panel: ESC, UP, DOWN, and ENTER. These are used for scrolling through menus (UP/DOWN) and accessing/modifying settings (ESC/ENTER).

3.4 LCD

The two-line Liquid Crystal Display (LCD) shows inverter operation status, data, service messages, and alarm/fault indications.

3.5 System Diagram

A system diagram illustrates the overall connectivity and components of the PV system with the inverter.

4. Installation

4.1 Select a Location for the Inverter

Consider the following criteria for safe operation and easy maintenance:

• WARNING: Do not install in areas with flammable materials or gases, or in potentially explosive atmospheres, to avoid overheating and ensure sufficient free space for air circulation.
• Exposure to direct sunlight can increase operational temperature and limit output power; protection against direct sunlight, rain, or snow is recommended.
• Operating Temperature Range: -13°F to 140°F (-25°C to 60°C).
• Relative Humidity: 0% to 95%.
• It is recommended to use a sun shade if ambient air temperature exceeds 104°F (40°C).
• Avoid installing in living areas to prevent noise disturbance.
• Install in a place inaccessible to children.
• Mount on a wall or strong structure capable of bearing the weight.
• Install vertically with a maximum incline of +/- 5°. Angles greater than +/- 5° can inhibit heat dissipation.
• For multiple adjacent inverters, maintain a minimum clearance of 12 inches (300mm) between units for adequate airflow.
• Ensure 20 inches (500mm) of clearance from the bottom of the inverter to the ground.
• Ensure visibility of the LED status indicator lights and the LCD.
• Provide adequate ventilation if installed in a confined space.
• NOTE: Nothing should be stored on or placed against the inverter.

4.2 Mounting the Inverter

Follow these steps for mounting:

1. Ensure the mounting bracket is vertical and mark the mounting holes.
2. For brick walls, ensure hole positions are suitable for expansion bolts.
3. Drill holes into the wall or pillar as marked.
4. Use expansion screws to fix the bracket to the wall. WARNING: The inverter must be mounted vertically.
5. Lift the inverter (recommended with at least 2 qualified personnel) and align the back bracket on the inverter with the convex section of the mounting bracket. Hang the inverter securely.
6. Use locking screws to fix the bottom of the inverter to the mount bracket. There are two holes at the bottom of the bracket: one for fixing the inverter, another for the lock.

4.3 Electrical Connections

WARNING: Only qualified personnel can perform electrical work. All electrical connections must be terminated in accordance with local and national standards.

NOTE: Press on the wiring box cover while loosening screws to avoid damaging screw threads.

WARNING: The PV strings generate high voltage. Ensure the inverter is isolated from any DC and AC power before making electrical connections.

Follow these steps strictly:

1. Switch the Grid Supply Main Switch (AC) OFF.
2. Switch the DC Switch OFF.

The wiring box has knockouts for DC and AC conduit entry. Refer to Table 1.1 for conduit trade sizes.

4.3.1 Terminal Connections

Strip wire ends 1/4" to 3/4". Use a slotted screwdriver, insert it into Terminal A (top) of the spring clamp terminal, insert the wire into Terminal B (bottom), and remove the screwdriver to secure the wire.

4.3.2 Connect PV Side of Inverter

• Warning: Ensure the PV string open circuit voltage is within the inverter's limit to prevent damage.
• DO NOT connect the PV array positive or negative to ground. Check for ground faults.
• Ensure PV strings have correct polarity before connecting to "DC+" and "DC-" terminals.
• DC Cable Size: Acceptable wire size is 12 AWG to 8 AWG copper conductors. Refer to local code for appropriate size.
• CAUTION: If PV strings are accidentally connected in reverse, or the inverter is faulty, do not turn off the DC switch immediately. This may cause a DC arc. Follow specific procedures involving current measurement and waiting for solar irradiance to decrease before turning off the DC switch and disconnecting PV strings. Damages due to wrong operations are not covered by warranty.

4.3.3 Connect Grid Side of Inverter

Solis Single Phase Inverters can connect to 208V or 240V grids. The default setting is for a 240VAC single-phase grid. Ground must be connected to the PE terminal.

• AC Cable Size: Recommended 10-25mm² (8-4 AWG) copper conductors.
• Grid Terminal Connection: Refer to Table 4.3 for connection requirements for 208V 3PH 3W and 240V SPLIT-PHASE systems.

4.3.4 Ground Connection

Both DC and AC ground cables can be connected to the ground terminal in the wiring box. Acceptable wire size for ground is 12 AWG to 8 AWG. Torque setting is 26 in-lbs (3 Nm) for the internal ground connection point. An external ground connection point is provided on the right side of the inverter; use M4 OT terminals with a torque setting of 20 in-lbs (2 Nm).

4.3.5 Max. Overcurrent Protection Device (OCPD)

An OCPD shall be installed to protect the inverter and AC grid conductors from overcurrent, designed in accordance with local jurisdiction and NEC.

4.3.6 Inverter Monitoring Connection

Remote monitoring is possible with a Solis data logger using LAN, WiFi, or cellular communication. Refer to Solis Monitoring Device installation manuals for connection instructions.

4.3.7 Module Level Rapid Shutdown (MLRSD)

This product provides a module-level shutdown feature to bring panel voltage to a safe level for firefighters, meeting NEC 690.12 requirements. Solis inverters come with integrated Tigo or APS transmitters. Refer to the MLRSD provider's manual for detailed installation.

4.3.8 Meter Connection (Optional)

The inverter can work with a split-phase smart Solis Acrel meter for Export Power Management. Ensure CTs are installed facing the correct direction (towards the grid).

5. Start & Stop

5.1 Start-up Procedure

Follow these steps in order:

1. Turn the AC switch ON.
2. Turn on any external DC switches, then turn the inverter DC switches ON. The inverter turns on if PV array voltage is above the start-up voltage. The red DC POWER LED and LCD will be continuously lit.
3. The inverter turns on when it detects DC power within the operating ranges. It then checks internal parameters and monitors AC voltage, frequency, and grid stability. The green OPERATION LED will flash, and the LCD will show INITIALIZING.
4. After the locally mandated delay (e.g., 300 seconds for IEEE-1547), the inverter starts generating AC power. The green OPERATION LED will light continuously, and the LCD will show GENERATING.

CAUTION: Inverter surface temperature can reach up to 75°C (167°F). Do not touch while operating. Install in a place inaccessible to children.

5.2 Shutdown Procedure

Follow these steps in order:

1. From the inverter LCD advanced settings, select "Grid Off". The Green Operation LED will go dark, and an alarm may indicate NO GRID, with the Yellow Alarm LED illuminating. The RED Power LED remains lit until DC power is removed.
2. Turn off the AC Switch between the Solis inverter and the Grid.
3. Wait approximately 30 seconds for AC side capacitors to dissipate energy. If the inverter has DC voltage above the start-up threshold, the red POWER LED will be lit. Turn the DC switch OFF.
4. Confirm all LEDs switch OFF (approximately one minute).

CAUTION: Even with the DC disconnect switch OFF and all LEDs OFF, wait five (5) minutes after disconnecting DC power before opening the inverter cabinet, as DC side capacitors can take up to five minutes to dissipate stored energy.

If alarm codes cannot be resolved or are not listed, contact Solis customer support. Provide the inverter model number, serial number, and internal transmitter type.

Solis US Technical Support:

• Phone Number: +1(866)438-8408
• Email: usservice@solisinverters.com

6. Operation

During normal operation, the display alternates between power and operation status every 10 seconds. Screens can be manually scrolled using the UP and DOWN keys. Press ENTER to access the Main Menu, and ESC to return to the previous menu.

6.1 Main Menu

The Main Menu provides access to four submenus:

• Information
• Settings
• Advanced Info.
• Advanced Settings

6.2 Information

This submenu provides access to operational data. The display shows values for DC voltage and current (V_DC1, I_DC1, V_DC2, I_DC2), Grid voltage and current (V_Grid, I_Grid), Status, Power output, Grid Frequency (F_Grid), Total Energy generated, monthly and daily energy, inverter serial number, Export Power Management (EPM) data, work mode, DRM number, and meter energy.

6.3 Settings

This menu allows for basic configuration:

6.3.1 Set Time

Allows setting the current time and date. Use UP/DOWN keys to adjust digits and ENTER to move between digits. ESC saves and returns.

6.3.2 Set Address

Used to assign an address (01-99) when multiple inverters are connected to a single monitor. The default address is "01". UP/DOWN keys adjust the address, ENTER saves, ESC cancels.

6.4 Advanced Info - Technicians Only

NOTE: Access requires a password. The default password is "0010".

This section provides detailed information:

• Alarm Message: Displays the 100 latest alarm messages.
• Running Message: Provides running status data like internal temperature.
• Version: Shows the model and software version.
• Daily Energy: Allows checking energy generation for a selected day.
• Monthly Energy: Allows checking energy generation for a selected month.
• Yearly Energy: Allows checking energy generation for a selected year.
• Daily Record: History of settings changes (for maintenance).
• Communication Data: Displays internal inverter data for service technicians.
• Warning Message: Displays the 100 latest warning messages.

6.5 Advanced Settings - Technicians Only

NOTE: Access requires a password. This area is for qualified technicians only.

This menu offers extensive configuration options:

1. Select Standard: Choose the grid reference standard (e.g., UL-240V, Rule21). Includes user-defined options with adjustable limits.
2. Grid ON/OFF: Starts or stops power generation.
3. Clear Energy: Resets historical yield data.
4. Reset Password: Sets a new password for advanced menus.
5. Power Control: Settings for active and reactive power, including power factor curves.
6. Calibrate Energy: Adjusts the total energy value, synchronizing with monitoring websites.
7. Special Settings: Includes Grid Filter, Relay Protection, ILeak Protection, Ground Protection, GRID INTF.02 Set, MPPT Parallel Mode, Constant Voltage Mode, V/FRT Set (Voltage and Frequency Ride-Through), IgZero_COMP.Set, PI Set, and IgADCheckPRO Set.
8. STD. Mode Settings: Configures working modes (e.g., Volt-watt, Volt-Var, Fixed-PF) based on selected standards (UL, Rule21), power rate limits, frequency derating, power priority, and initial settings.
9. Restore Settings: Resets special settings to default values.
10. HMI Update: Used for updating the LCD program.
11. Internal EPM Set: Configures Export Power Management modes (EPM OFF, Meter in Load, Meter in Grid), backflow power limits, and fail-safe options.
12. External EPM Set: Enables settings for external Solis EPM devices (5G-EPM, Others-EPM).
13. Restart HMI: Restarts the Human-Machine Interface.
14. Debug Parameter: For manufacturer maintenance personnel only.
15. DSP Update: Used for updating the DSP.
16. Compensation Set: Calibrates inverter output energy and voltage.

6.6 Arc Fault (AFCI version)

The inverter has a built-in AFCI function to detect arc faults in the DC circuit. If an arc fault occurs, the inverter stops output, and the LCD displays an ARC-FAULT message. Check DC cables and connections to identify the source. Press ESC for 3 seconds to restart.

7. Maintenance

Solis single-phase inverters require no regular maintenance. Cleaning dust from the heat sink can help dissipate heat and increase lifespan. Use a soft brush for cleaning.

CAUTION: Turn off the inverter and wait for it to cool down before performing any maintenance or cleaning. Do not touch hot surfaces.

The LCD and LED status indicators can be cleaned with a damp cloth if necessary. Never use solvents, abrasives, or corrosive materials.

8. Troubleshooting

The inverter is designed to meet international grid-tied standards. In case of failure, the LCD screen will display an alarm message, and the inverter may stop feeding into the grid. The following table lists common alarms, their causes, and solutions:

NOTE: If the inverter displays an alarm message, turn it off (Section 5.2), wait 5 minutes, and restart it (Section 5.1). If the failure persists, contact your local distributor or service center. Be ready with the inverter serial number, distributor information, installation date, problem description (alarm message, LED status, readings), PV array configuration, and your contact details.

Solis US Technical Support:

• Phone Number: +1(866)438-8408
• Email: usservice@solisinverters.com

9. Specifications

Solis-1P6K-4G-US

Solis-1P7.6K-4G-US

Solis-1P10K-4G-US

Manufacturer Information

Manufacturer: Ginlong Technologies Co.,Ltd., Ningbo, Zhejiang, P.R.China

US Office: 565 Metro Pl. S. Suite 3214, Dublin OH 43017, USA

Toll-free: 866.438.8408

Email: sales@ginlong.com | ussales@ginlong.com

Web: www.ginlong.com

Please adhere to the actual products in case of any discrepancies in this user manual.

Certifications: SunSpec Certified, Comply with CA Rule 21/ Certified to UL 1741 SA and SB.