Sofar solar SOFAR 75KTL User Manual (English)

Brian JonesAug 1, 2025

What to do if my Sofar solar Inverter displays a GridOVP error?

T
Thomas AdamsAug 1, 2025
If your Sofar solar Inverter shows a GridOVP alarm occasionally, it might be due to temporary issues with the electric grid. The inverter should automatically resume normal operation once the grid stabilizes. However, if the alarm appears frequently, verify that the grid voltage and frequency are within the allowed range. Also, inspect the AC circuit breaker and AC wiring connected to the inverter. If the grid voltage/frequency is outside the acceptable range, and the AC wiring is properly connected, but the alarm persists, it is advisable to contact technical support to adjust the grid over-voltage, under-voltage, over-frequency, and under-frequency protection settings.

Brand	Sofar solar
Model	SOFAR 75KTL
Category	Inverter
Language	English

Brand

Sofar solar

Model

SOFAR 75KTL

Preface

Notice

Company's terms and conditions apply to purchased products and services.

Save this Instruction

Manual is integral part of equipment, keep for future reference.

Copyright Declaration

Manual copyright belongs to Shenzhen SOFARSOLAR Co., Ltd.

1. Basic Safety Information

Safety Instruction

Introduces safety instructions for installation and operation of SOFAR 75~136KTL.

Symbols Instruction

Explains symbols shown on the inverter and type label.

1.1. Requirement for Installation and Maintenance

Installation must conform to laws and regulations. Read manual before installation.

1.2. Symbols and signs

Explains danger, warning, caution, attention, and note symbols used in the document.

2. Product Characteristics

2.1. Intended Use

SOFAR 75~136KTL is a transformerless on-grid PV inverter for grid-compliant conversion.

Product Dimensions

Details the physical dimensions of the SOFAR 75~136KTL inverter.

2.2. Function Description

Describes how DC power is converted to AC power by the inverter's boards.

2.3. Electrical block diagram

Shows the internal electrical structure of the SOFAR 75~136KTL inverter.

2.4. Efficiency and derating curve

Presents efficiency curves for different models of the inverter.

2.5. Others

Provides additional technical details not covered in other sections.

3. Inverter Storage

Storage condition requirements

Details requirements for placing, temperature, and humidity for inverter storage.

4. Installation

4.1. Installation Process

Outlines the step-by-step process for installing the product.

4.2. Checking Before Installation

Instructions for checking outer packing materials and deliverables.

4.3. Tools

Lists the necessary tools for installation and electrical connection.

4.4. Determining the Installation Position

Guidance on selecting an appropriate location for inverter installation.

4.5. Moving of inverter

Provides methods for safely moving the inverter, including manual handling and lifting.

4.6. Installation

Details the physical installation steps for the inverter on a wall or bracket.

5. Electrical Connection

5.1 Electrical Connection

Introduces the process of electrical connections for the inverter.

5.2. Terminal Connector

Describes the layout and function of the inverter's terminal connectors.

5.3. Grounding Connection (PE)

Explains how to properly connect the inverter to the grounding electrode.

5.4. Connect grid side of inverter(AC-Output)

Details the process for connecting the inverter's AC output to the utility grid.

5.5. Connect PV side of inverter (DC-Input)

Guides on connecting the PV array to the inverter's DC input.

5.6 Communication Connection

Explains how to establish communication connections using USB, Wi-Fi, or Ethernet.

6. Commissioning of inverter

6.1. Cable Connection Inspection

Guide for checking AC and DC voltage before initial operation.

6.2. Start Inverter

Steps for safely starting the inverter after all connections are made.

7. Operation interface

7.1. Operation and Display Panel

Describes the inverter's buttons and indicator lights.

7.2. Standard Interface

Shows examples of the LCD interface displaying inverter status and data.

7.3. Main Interface

Details how to navigate the main menu and access settings.

7.4. Updating Inverter Software

Step-by-step guide to update the inverter's software via USB.

8. Trouble shooting and maintenance

8.1. Troubleshooting

Lists potential errors, their causes, and solutions for the inverter.

8.2. Maintenance

Provides guidance on cleaning and maintaining the inverter.

8.3. Anti-PID

Explains the Anti-PID function and its operation for PV module protection.

9. Technical Data

9.1. Input parameters (DC)

Lists the DC input specifications for different inverter models.

9.2. Output Parameter (AC)

Lists the AC output specifications for different inverter models.

9.3. Performance Parameter

Details performance metrics like efficiency and certifications.

9.4. General Data

Provides general technical specifications like topology, dimensions, and weight.

10. Quality Assurance

Standard warranty period

Explains the standard warranty terms and calculation methods.

Extended warranty period

Details options and conditions for purchasing extended warranty.

Invalid warranty clause

Lists conditions under which the warranty is not applicable.

Sofar solar SOFAR 75KTL User Manual

Table of Contents

Questions and Answers:

Sofar solar SOFAR 75KTL Specifications

Summary