EASUN POWER IGrid SV II 15KW Hybrid Solar Inverter User Manual

1. Introduction

This manual provides essential information for the installation, operation, and maintenance of the EASUN POWER IGrid SV II 15KW Hybrid Solar Inverter. This inverter is designed for both grid-tied and off-grid solar applications, featuring a 48V system, 230V output, 100A MPPT solar charger, and 450Vdc PV input. It supports both single-phase and three-phase configurations when paralleled.

The 15KW system is achieved by paralleling three IGrid SV II 5KW inverters with a parallel kit.

Figure 1: Three EASUN POWER IGrid SV II 15KW hybrid solar inverters, highlighting Max 15KW PV Power and 100A Solar Charge Current.

2. Safety Warnings

• This inverter is non-isolated. Only single crystalline, poly crystalline with Class A rating, and CIGS modules are acceptable PV module types.
• To prevent malfunction, do not connect any PV modules with potential current leakage to the inverter. Grounded PV modules, for instance, can cause current leakage. When using CIGS modules, ensure no grounding.
• Before connecting to the AC input power source, install a separate AC breaker between the inverter and the AC input. This ensures safe disconnection during maintenance and protection from overcurrent. Recommended AC breaker specifications: 16A for 1.5KW, 32A for 3KW, and 50A for 5KW.
• Observe the 'IN' and 'OUT' markings on the terminal blocks. Do NOT misconnect input and output connectors.

3. Product Features

• Pure sine wave output, max 5000W per unit.
• Max 100A MPPT solar charger (max 5KW PV array per unit).
• Max 450Vdc PV input.
• Hybrid Grid-Tie / Off-Grid solar inverter for 48V systems.
• Parallel support for up to 9 units.
• Batteryless operation capability.
• Total system max charging: 100A.
• Bundled monitoring & setting software.
• Supports 50Hz or 60Hz (program adjustable).
• Grid feedback functionality for excess energy.
• USB interface available for communication.
• Compatible with AC grid or generator power.
• Timer setting for AC charging & output.

Figure 2: Key features of the IGrid SV II inverter, including Max PV Input 450VDC, Max Output Power 15KW Pure Sine Wave, Battery Voltage 48VDC, Genset Starter (Dry Contact), Output Voltage 220/230/240 VAC Single Phase, Solar Charge Current MPPT 100A Max, Parallel Support (up to 9), AC Charge Current 100A, Communication (USB, RS232).

4. Specifications

5. Setup and Installation

5.1 System Overview

The EASUN POWER IGrid SV II Hybrid Solar Inverter integrates solar power, battery storage, and grid connection to provide a reliable power supply for your home or business. It can operate in various modes depending on solar availability, battery charge, and grid status.

Figure 3: Hybrid System Diagram. Solar panels feed power to the inverter, which can power loads, charge batteries, or feed into the grid.

5.2 PV Panel Configuration

When selecting and connecting PV modules, ensure the following parameters are met:

• The open circuit voltage (Voc) of PV modules must not exceed the maximum PV array open circuit voltage of the inverter (450 VDC).
• The open circuit voltage (Voc) of PV modules should be higher than the minimum battery voltage.

Figure 4: PV Panel Configuration for IGrid SV II 15KW. Max PV panel power is 15000W, typically using 20pcs of 250W panels, configured as 10pcs in series and 2pcs in parallel. Maximum Power (Pmax) is 250W, Max. Power Voltage Vmpp(V) is 36V, and Max. PV module numbers in series is 10*36V = 250~430VDC.

Figure 5: PV Connection Diagram and Table. This diagram shows solar panels connected to the inverter, which then connects to the grid and powers a house. The table provides detailed PV connection parameters for the IGrid SV II 15KW model, including Total PV panel (15000W), Maximum PV Array Power (12000W), Maximum PV Array Open Circuit Voltage (450V), Maximum Charging Current (from PV) (100A), Maximum Power (Pmax) (250W), Max. Power Voltage Impp(A) (8.3A), Open Circuit Voltage Voc(V) (40V), and Short Circuit Current Isc(A) (8.9A).

5.3 Rear Panel Connections

Familiarize yourself with the inverter's rear panel connections before installation.

Figure 6: Inverter Rear Panel Connectors. Key connections include AC Input, AC Output, RS232, USB, PV Input, DC Input, Parallel Connection ports, and the Power On/Off switch.

Figure 7: Labeled Rear Panel. 6 USB communication port, 7 Dry contact, 8 Grid connectors, 9 RS-232 communication port, 10 PV connectors, 11 Power on/off switch, 12 Circuit breaker, 13 AC output connectors (Load connection), 14 Current sharing cable, 15 Parallel communication cable, 16 Battery connectors.

5.4 Parallel Connection

The IGrid SV II inverter supports parallel operation for increased power output, up to 9 units. For a 15KW system, three 5KW units are typically combined using a parallel kit.

Figure 8: 15KW Parallel Setup. This diagram illustrates how three 5KW inverters are connected with a parallel kit to achieve a total output of 15KW.

Figure 9: Parallel Operation. This diagram shows power connection for parallel operation in both single-phase and 3-phase configurations, supporting up to nine inverters.

5.5 Battery Connection

For 48VDC systems, ensure proper battery configuration. For example, a 3KVA model supports a 48VDC system and requires at least a 200Ah capacity battery.

Figure 10: Battery Connection. This diagram illustrates connecting a 3KVA inverter to four 12V batteries in series to form a 48VDC system.

6. Operating Instructions

6.1 Product Overview: LCD Display and Buttons

The inverter features an intuitive LCD display and function buttons for monitoring and configuration.

Figure 11: Product Overview. The front panel includes: 1 LCD Display, 2 Charging Indicator, 3 Fault Indicator, 4 Function Buttons (ESC, UP, DOWN, ENTER), and 5 Status Indicator.

LED Indicator Messages:

Function Key Descriptions:

6.2 System Operation Modes

The inverter can operate in various modes, adapting to solar power availability, AC power availability, and battery connection status.

Figure 12: System Diagram. This diagram illustrates four operational scenarios: 1. Solar Power available (without battery), 2. AC Power available (without battery), 3. Solar Power and AC Power available (with battery), and 4. Solar Power and AC Power not available (with battery). Each diagram shows the power flow between solar, grid, inverter, battery, and connected home appliances.

7. Monitoring Interface

The inverter can be monitored and configured using bundled software via USB or RS232 connection to a computer. The Graphical User Interface (GUI) provides five main sections for status monitoring.

Figure 13: Monitoring Interface. The inverter connects to a computer via USB or RS232 (cable included) with a software CD. The GUI displays five sections: Power on Mode, Standby Mode, Line Mode, Battery Mode, and Fault Mode.

8. Maintenance

Regular maintenance ensures optimal performance and longevity of your inverter system.

• Cleaning: Periodically clean the inverter's exterior to prevent dust accumulation, which can hinder heat dissipation. Ensure the inverter is turned off and disconnected from all power sources before cleaning.
• Ventilation: Ensure that the inverter's ventilation openings are clear and unobstructed to allow for proper airflow.
• Connections: Regularly check all electrical connections (PV, battery, AC input/output, communication) for tightness and signs of corrosion. Loose connections can lead to poor performance or safety hazards.
• Battery Health: If using batteries, monitor their health and charge levels according to the battery manufacturer's recommendations.
• Firmware Updates: Check the manufacturer's website for any available firmware updates to ensure your inverter has the latest features and bug fixes.
• Environmental Check: Ensure the operating environment remains within the specified temperature and humidity ranges.

9. Troubleshooting

This section provides guidance for common issues. For complex problems, contact technical support.

• No Power Output: Check AC input breaker, DC input from PV panels, and battery connections. Verify the inverter is switched ON. Check for any fault indicators on the LCD.
• Low Power Output: Inspect PV panels for shading or dirt. Check PV array voltage and current. Ensure battery charge is sufficient if operating in battery mode.
• Fault Indicator On/Flashing: Refer to the LED Indicator Messages table (Section 6.1) for specific fault codes or warning conditions. Disconnect power, wait a few minutes, and restart the inverter. If the fault persists, consult the full manual or contact support.
• Communication Issues (USB/RS232): Ensure cables are securely connected. Verify correct driver installation for the monitoring software. Check software settings for proper port selection.
• Inverter Not Charging Batteries: Check PV input voltage and current. Verify battery connections and voltage. Ensure charging settings in the inverter are correctly configured.

10. User Tips

• Initial Testing: After installation, perform a basic test with AC input (220Vac) to confirm basic functionality before connecting the full PV array and batteries.
• PC Connection: Ensure successful PC connection for monitoring and advanced settings. This allows for fine-tuning of grid connection and other operational parameters.
• Parallel Kit: When expanding your system with parallel units, always use the official parallel kit and ensure all inverters are identical models for proper synchronization.
• Battery Capacity: For optimal performance and battery longevity, ensure your battery bank capacity meets or exceeds the minimum recommendations for your inverter model.

11. Accessories

The inverter package typically includes the main unit, a user manual, a software CD, and necessary communication cables.

Figure 14: Included Accessories. The package contains the inverter, user manual, software CD, and communication cables.

11.1 Optional Accessories

Several optional accessories can enhance the functionality of your inverter system:

• Remote LCD Controller: (Note: This device is listed as 'Unsupported Device' in some documentation, only select models are supported for extension up to 15m).
• SNMP Box/Card: Enables the inverter to be visible through a network or the web. An IP may need to be purchased from an ISP.
• WIFI Box: Allows inverter access via WIFI in either AP mode (access point) or STA mode (station mode).
• Parallel Kit: A required accessory for inverters that support parallel operation. Only identical models can be paralleled together.

Figure 15: Packing and Optional Accessories. This image shows the inverter packaging, included accessories, and optional accessories such as the Remote LCD controller, SNMP Box/Card, WIFI Box, and Parallel Kit.

12. Certifications

The EASUN POWER IGrid SV II Hybrid Solar Inverter holds various certifications, including CE, ensuring compliance with relevant safety and quality standards.

Figure 16: Product Certifications. This image displays various certifications, including CE, for the inverter.