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SOLIS 4G series - User Manual

SOLIS 4G series
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User Manual
for 4G Series Grid Inverter
Version 1.0, Release Date: 09,2022
Applicable models
Solis-1P2.5K-4G-US
Solis-1P3K-4G-US
Solis-1P3.6K-4G-US
Solis-1P3.8K-4G-US
Solis-1P4K-4G-US
Solis-1P4.6K-4G-US
Solis-1P5K-4G-US
Solis-1P6K2-4G-US
Applicable System
Single phase system

Table of Contents

Other manuals for SOLIS 4G series

Preview: Installation And Operation Manual
Installation And Operation Manual28 pages

Questions and Answers

  • C
    chelseawalkerAug 28, 2025
    What does it mean when my SOLIS 4G shows OV-G-F: Over Grid Frequency?
    • C
      Cynthia BakerAug 28, 2025
      If your SOLIS Inverter displays 'OV-G-F: Over Grid Frequency', it means the inverter is detecting that the grid frequency is too high. With the DC switch OFF, check the frequency at the inverter test points. If the frequency measures high, adjust the upper limit with permission from the utility and check the LCD reading, as it may be a bad measurement circuit. With the DC Switch ON, verify the appropriate Grid Standard. If problems persist, consider replacing the inverter.
  • J
    jerrygrayAug 29, 2025
    What does it mean if my SOLIS Inverter shows UN-G-F: Under Grid Frequency?
    • J
      jessicathomasAug 29, 2025
      If your SOLIS Inverter displays 'UN-G-F: Under Grid Frequency', it means the inverter is detecting that the grid frequency is too low. With the DC switch OFF, check the frequency at the inverter test points. If the frequency measures low, adjust the lower limit with permission from the utility and check the LCD reading, as it may be a bad measurement circuit. With the DC Switch ON, verify the appropriate Grid Standard. If the issue continues, the inverter may need to be replaced.
  • J
    Jennifer BriggsAug 29, 2025
    What to do if my SOLIS 4G Inverter displays OV-TEM: Temperature Protection?
    • D
      David MartinezAug 29, 2025
      If your SOLIS Inverter displays 'OV-TEM: Temperature Protection', it means the inverter detects a high ambient temperature, specifically above 60C. Inspect the installation, checking the heatsink for any obstructions and ensuring adequate ventilation. Verify that the inverter is not in direct sunshine and measure the ambient temperature near the inverter. If the temperature is within range, the inverter may need to be replaced.
  • S
    Sarah GarrisonAug 30, 2025
    What should I do if my SOLIS 4G Inverter shows ARC-FAULT?
    • M
      murphyemilyAug 30, 2025
      If your SOLIS Inverter displays 'ARC-FAULT', it indicates that the inverter has detected an arc in the DC circuit. Inspect the installation, check the cable with a string tester, and physically check the cables. Also, inspect the panel junction boxes and cable connections. Try resetting the inverter. If the problem persists, consider replacing the inverter.
  • D
    Dr. Robin Hoffman MDAug 25, 2025
    Why does my SOLIS 4G say NO-GRID?
    • A
      ashley50Aug 25, 2025
      If your SOLIS Inverter is showing 'NO-GRID', it means the inverter is not detecting the grid. With the DC switch OFF, check the AC voltage at the inverter test points (L-L, L-GND). Check the LCD reading, as it may indicate a bad measurement circuit. With the DC Switch ON, check the grid standard. If problems persist, the inverter may need replacement.
  • W
    William WilliamsAug 31, 2025
    What does it mean when my SOLIS Inverter displays GRID-INTF: Grid unstable?
    • M
      Mrs. Diane RodriguezSep 1, 2025
      If your SOLIS Inverter displays 'GRID-INTF: Grid unstable', it means the inverter detects grid instability and a high internal fault current. With the DC Switch OFF, measure the AC voltage and test the AC line for THD. With the DC Switch ON, test the AC line for THD again. If you have multiple inverters, try turning one off. You may need an impedance matching adjustment or box. Internal damage or a loose wire in shipping could also be the cause.
  • M
    marcus08Sep 1, 2025
    What to do if my SOLIS 4G Inverter displays PV ISO-PRO 01/02: Ground Protection?
    • K
      kylebrewerSep 1, 2025
      If your SOLIS Inverter displays 'PV ISO-PRO 01/02: Ground Protection', it means the inverter detects low DC insulation resistance. First, inspect the installation and reset the inverter. Note the weather conditions when the alarm occurs. Measure the insulation resistance; if it's normal, measure again in the same weather conditions as when the alarm occurred. Physically check the cables. If the problem continues, the inverter may need to be replaced.
  • C
    chanjenniferSep 2, 2025
    How to troubleshoot a SOLIS Inverter with no information (blank screen)?
    • S
      Stephanie FordSep 2, 2025
      If your SOLIS Inverter shows no information or a blank screen, it could be due to several reasons: low or missing input voltage, reversed polarity, or a damaged main board. To troubleshoot, first test with the DC switch OFF by checking PV connections, polarity, and ensuring the voltage is greater than 120V for single-phase or greater than 350V for three-phase systems. Then, test with the DC Switch ON, again checking the voltage. If the DC voltage is “0”, the inverter may need to be replaced.
  • S
    Sarah SantanaSep 2, 2025
    Why is my SOLIS 4G stuck in initializing mode?
    • J
      joefordSep 3, 2025
      If your SOLIS Inverter is stuck in 'Initializing' mode, it could be waiting for a driving signal. To resolve this, test with the DC switch OFF by checking the PV connections, polarity, and ensuring the voltage is greater than 120V for single-phase or greater than 350V for three-phase systems. Then, test with the DC Switch ON, again checking the voltage. A cable may have been damaged or loosened during shipping, which might require replacing the inverter.
  • A
    Antonio BennettSep 3, 2025
    What to do if my SOLIS 4G displays OV-BUS: DC BUS voltage is too high?
    • R
      Rachael WhiteSep 3, 2025
      If your SOLIS Inverter displays 'OV-BUS: DC BUS voltage is too high', it means the inverter detects a high DC voltage on the internal bus. Measure both DC and AC voltages and compare them with the LCD readings. The inverter may need to be replaced due to internal damage or a wire that came loose during shipping.

Summary

Safety & Warning Information

Safety Symbols Explained

Explains hazard warning symbols used throughout the manual for safety awareness.

General Safety Instructions

Crucial safety guidelines for operating and installing the inverter to prevent hazards.

Notice For Use

Installation Guide

Selecting Inverter Location

Criteria for choosing an optimal and safe installation site for the inverter.

Mounting the Inverter

Instructions and clearance requirements for physically mounting the inverter securely.

Terminal Connections

Connect PV Side of Inverter

Procedures for connecting the solar panel DC input, including polarity and voltage checks.

Connect Grid Side of Inverter

Guidelines for connecting the inverter to the AC grid, specifying voltage and phase.

Ground Connection

Max. Overcurrent Protection Device (OCPD)

Start & Stop Procedures

Inverter Start-up Procedure

Step-by-step guide to safely start up the inverter according to sequence.

Inverter Shutdown Procedure

Step-by-step guide to safely shut down the inverter in the correct order.

Operation and Settings

Main Menu and Basic Settings

Arc Fault Detection (AFCI)

Troubleshooting Inverter Issues

Common Inverter Faults and Solutions

Guide to identifying and resolving common inverter alarms and operational issues.

Grid Voltage and Frequency Issues

DC Input and Bus Faults

Protection and Communication Faults

AFCI and Arc Faults

Technical Specifications

Solis-1 P2.5 K-4 G-US Specifications

Detailed technical specifications for the 2.5kW Solis 4G series inverter.

Solis-1 P3.6 K-4 G-US Specifications

Detailed technical specifications for the 3.6kW Solis 4G series inverter.

Solis-1 P3.8 K-4 G-US Specifications

Solis-1 P4 K-4 G-US Specifications

Solis-1 P4.6 K-4 G-US Specifications

Solis-1 P5 K-4 G-US Specifications

Solis-1 P6 K2-4 G-US Specifications

SOLIS 4G series Specifications

General IconGeneral
Frequency50Hz / 60Hz
Output Power Range3.0kW - 6.0kW
AC Output Voltage230V
CommunicationRS485
CoolingNatural Cooling
Operating Temperature Range-25°C ~ +60°C
ProtectionIP65

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