Y&H 4.2KW Hybrid Solar Inverter User Manual

About This Manual

Purpose

This manual introduces the assembly, installation, operation, and troubleshooting of the Y&H 4.2KW Hybrid Solar Inverter. Please read this manual carefully before installation and operation to ensure proper functionality and safety.

Target Group

This manual is designed for both professionals and end-users. Operations that do not require specific skills can be handled by end-users. Professionals should possess the following skills:

• Understand how the inverter works and operates.
• Knowledge of handling crises and risks in the installation and use of electrical equipment.
• Ability to install and commission electrical equipment and fixtures.
• Understanding and adherence to applicable standards, directives, and safety knowledge.

Safety Regulations

Warning: This article contains important safety and operation instructions. Please read and save this manual for future reference.

1. Choose the corresponding setting for lead-acid or lithium battery. Incorrect settings may cause system malfunction.
2. Read all instructions and cautions on the unit and understand all battery models and relevant chapters in this manual before use.
3. Never short-circuit AC output and DC input. Do not connect mains when DC input is short-circuited.
4. Never charge a non-rechargeable battery.
5. Do not disassemble the unit. For maintenance or repair, send it to a professional technical service center. Incorrect reassembly may lead to electric shock or fire.
6. To reduce electric shock risk, disconnect all wiring before maintenance or cleaning. Turning off the device alone does not eliminate this risk.
7. Exercise extreme caution when using metal tools on or around the battery to prevent short circuits or other electronic component damage.
8. Select the appropriate cable size for optimal operation of this off-grid solar inverter.
9. When disconnecting AC or DC terminals, strictly follow the installation procedure.
10. This off-grid solar inverter must be connected to a permanent grounding wiring system, complying with local requirements.
11. Provide a fuse meeting specifications for battery power supply overcurrent protection.
12. Warning: Only professional service personnel can repair this equipment. If errors persist after troubleshooting, return the inverter to the local dealer or service center.

Introduction

The Y&H 4.2KW Hybrid Solar Inverter is a multifunctional off-grid solar inverter that integrates an MPPT solar charging controller, a high-frequency pure sine wave inverter, and a UPS function module. It is ideal for off-grid backup power supply and self-consumption systems. Its high-frequency transformer design ensures reliable power conversion in a compact size.

For complete system operation, additional equipment such as photovoltaic modules, a generator, or a utility grid may be required. Consult your system integrator for other possible system components. An optional WiFi module allows for remote monitoring of the solar system's status via mobile phones or websites.

Features

• Supports two battery voltage modes: 12V (max 2300W load) and 24V (max 4200W load).
• Pure sine wave output inverter.
• Selectable input voltage range for utility grid based on load requirements (household appliances/personal computers).
• Adjustable charging current via LCD based on battery requirements.
• Simultaneous power supply to loads from solar energy and utility grid.
• AC input compatible with mains and generator.
• Automatic restart function upon mains power restoration.
• Comprehensive protection: Overload, Over temperature, Short circuit.
• Intelligent battery charging design for optimized battery utilization.
• RS485 port for BMS communication.
• Cold start function.
• Built-in MPPT with operating voltage range 55V-500V and open circuit voltage 500Voc.
• Optional WiFi remote monitoring.
• Optional RGB lamp displaying inverter status with different colors.
• Built-in anti-dust kit for harsh environments.

Basic System Architecture

The following diagram illustrates the basic application of this inverter/charger, including connections to a generator or mains electricity and optional solar modules. This inverter can power various home and office appliances, including motor-type appliances like refrigerators and air conditioners.

Setup (Installation)

Unpacking and Inspection

Unpack the inverter and inspect for any damage. The package should contain:

• Machine x 1
• User manual x 1

Preparation Before Installation

Before connecting any wiring, remove the bottom cover by unscrewing the two screws.

Installation

Consider the following points for installation:

• Do not install on flammable building materials.
• Install on a solid surface.
• Install at eye level for easy LCD display reading.
• Maintain a 20-50 cm gap for ventilation and heat dissipation.
• Operating environment temperature should be 0-55°C.
• Install vertically against the wall, ensuring adequate space from the ground.

Suitable for installation on concrete or other non-combustible surfaces only.

Tighten the screws to fix the installation. M4 or M5 screws are recommended.

Battery Connection

Warning: Shock Hazard. Installation must be performed with care due to high battery voltage in series.

Caution: Do not place anything between the inverter terminal and the ring terminal to avoid short circuits or overheating.

Caution: Do not apply antioxidant to the terminal before it is tightly connected.

Caution: Before final DC connection, ensure positive (+) is connected to positive (+) and negative (-) to negative (-).

It is required to install an independent DC overcurrent protector or disconnect device between the battery and the inverter. All wiring must be performed by qualified personnel. Use appropriate cable for battery connection to ensure system safety and efficient operation.

Recommended Battery Cable Specifications:

Note: The recommended charging current for lead-acid batteries is 0.2C (C is battery capacity).

Lead-Acid Battery Connection Steps:

1. Connect the battery according to the recommended cable specifications.
2. Connect all battery packs as needed.
3. Insert the ring terminal of the battery cable into the inverter's battery connector flatly. Tighten bolts with a torque of 2-3 Nm. Ensure correct polarities and tighten the ring terminal to the battery terminal.

Lithium Battery Connection:

If using lithium batteries, only those matched with BMS communication protocol are allowed. Follow the lead-acid battery connection steps (1-2), then:

3. Connect one side of the RJ45 cable to the inverter's BMS communication port.
4. Insert the other side of the RJ45 cable into the lithium battery's RS485 communication port.

Note: Ensure the lithium battery BMS port's PIN corresponds with the inverter BMS communication port. If using a lithium battery, connect the BMS communication cable and select 'LIB' mode in program 05, then select the matching battery protocol in program 10.

AC Input/Output Connection

Caution: Install a separate AC breaker between the inverter and AC input power source for secure disconnection and overcurrent protection.

Caution: There are 'IN' and 'OUT' markings on terminal blocks. Do NOT misconnect input and output connectors.

Warning: All wiring must be performed by qualified personnel. Use appropriate cable size for AC input connection.

Suitable Cable Specifications for AC Wires:

AC Input/Output Connection Steps:

1. Before making AC input/output connections, ensure the DC protector or disconnector is open.
2. Remove 10mm of insulation sleeve for six conductors. Shorten phase L and neutral conductor N by 3mm.
3. Insert AC input wires into the terminal block according to polarities. Tighten terminal screws. Connect PE protective conductor (yellow-green) first. L (brown or black) to LINE, N (blue) to Neutral.
4. Warning: Ensure AC power source is disconnected before hardwiring to the unit.
5. Insert AC output conductors according to polarity identification at the terminal and tighten the screw. L (brown or black) to LINE, N (blue) to Neutral.
6. Ensure all wires are firmly connected.

PV Connection

Caution: Install a DC circuit breaker between the inverter and PV module.

Warning: All wiring must be performed by qualified personnel. Use appropriate cable for PV module connection.

PV Module Selection Parameters:

• Open circuit Voltage (Voc) of PV modules must not exceed the max. PV array open circuit voltage of the inverter (500V).
• Open circuit Voltage (Voc) of PV modules should be higher than the minimum battery voltage.

PV Module Connection Steps:

1. Remove 10mm of insulation sleeve for positive and negative conductors.
2. Check correct polarity of connection cable from PV modules and PV input connectors. Connect positive pole (+) to positive pole (+) of PV input connector, and negative pole (-) to negative pole (-) of PV input connector.
3. Ensure wires are securely connected.

Final Assembly

After connecting all wires, reattach the bottom cover and screw it into place.

Operating

Power On/Off

After correctly installing the machine and connecting the battery, simply press the On/Off switch to power on the inverter.

Operation and Display

The front panel of the inverter features an LCD screen and four function keys for indicating operation status and input/output power information.

Function Keys:

• ESC: To exit setting mode.
• UP: To go to previous selection.
• DOWN: To go to next selection.
• ENTER: To confirm selection or enter setting mode.

RGB Light (Optional):

• Green light: Inverter state.
• Blue light: Utility state.
• Red light: Failure state.

LED Indicator:

LCD Setting

Press and hold the 'ENTER' button for 3 seconds to enter setting mode. Use 'UP' or 'DOWN' to select programs, and 'ENTER' to confirm or 'ESC' to exit.

Key Setting Programs:

Operating Mode Description

Maintenance

Clearance and Maintenance for Anti-Dust Kit (Optional)

The inverter comes with a factory-installed anti-dust kit. This kit helps prevent dust ingress and increases product reliability in harsh environments. The inverter automatically detects this kit and activates an internal thermal sensor to adjust temperature.

Maintenance Steps:

1. Remove the screws on the bottom cover.
2. Remove the air filter.
3. Clean the air filter. After cleaning, reinstall the dust removal net to the inverter.

Notice: The anti-dust kit should be cleaned from dust every one month.

Battery Equalization

The charge controller includes an equalization function to reverse negative chemical effects like stratification and remove sulfate crystals, which can reduce battery capacity. It is recommended to equalize batteries periodically.

How to Apply Equalization Function:

First, enable the battery equalization function in monitoring LCD setting program 33. Then, you can apply this function by:

• Setting an equalization interval in program 37.
• Activating equalization immediately in program 39.

When to Equalize:

In the float stage, when the set equalization interval is reached or equalization is actively initiated, the controller will enter the Equalize stage.

Equalize Charging Time and Timeout:

During the equalize stage, the controller charges the battery until its voltage reaches the equalization voltage. Constant voltage regulation then maintains the battery at this voltage. The battery remains in the Equalize stage until the set battery equalized time is reached.

If the battery equalized time expires and the battery voltage has not reached the equalization voltage point, the charge controller will extend the equalized time until the battery voltage is achieved. If the battery voltage is still lower than the equalization voltage after the extended time, the charge controller will stop equalization and return to the float stage.

Troubleshooting

Battery Alarm Code

Battery Fault Code

Warning Code

General Troubleshooting

Specifications

Table 1: Specification of LINE Mode

Table 2: Specification of Inverter Mode

Table 3: Specification of Charging Mode

Table 4: General Specifications

User Tips

• For optimal performance, ensure all wiring connections are secure and follow the recommended cable gauges. Loose connections can lead to efficiency loss or safety hazards.
• Regularly check the LCD display for any warning or fault codes. Addressing these promptly can prevent larger issues.
• If using lithium batteries, always ensure the BMS communication cable is properly connected and the correct battery protocol is selected in the inverter settings.
• Periodically clean the anti-dust kit (monthly is recommended) to maintain proper airflow and prevent overheating, especially in dusty environments.
• When configuring charging and output priorities, consider your specific energy needs and local grid stability to maximize efficiency and battery lifespan.

Warranty and Support

For detailed warranty information, service, and technical support, please refer to the official user manual PDF provided by the manufacturer. This document contains comprehensive details regarding warranty terms, contact information for support, and procedures for service requests.

You can access the full user manual PDF at: Y&H 4.2KW Hybrid Solar Inverter User Manual (PDF)