Case study - achieved reliable power with a 61kWh hybrid solar energy storage systems project

1. Project Overview

In response to frequent power outages and high ambient temperatures in Iraq, a robust hybrid solar energy storage system has been deployed, combining the Deye hybrid inverter with four MOTOMA M89 LiFePO₄ battery modules. The total system capacity reaches 61.44kWh, providing stable, uninterrupted power for critical three-phase loads.

2. System Components

MOTOMA M89 Battery (15.36kWh/unit)

• Nominal Voltage/Capacity: 51.2V / 300Ah
• Total Installed Capacity: 61.44kWh (4 units in parallel)
• Cycle Life: ≥6000 cycles @ 80% DOD
• Intelligent BMS with CAN/RS232/RS485 communication
• Compatible with Deye, Growatt, and other mainstream inverters
• Compact design with mobile wheels for easy maintenance

Deye Inverter

• Three-phase hybrid inverter, 10kW output
• Supports unbalanced three-phase load operation
• Dual MPPT design with up to 13kW PV input
• Compatible with 48V battery banks
• Black-start capability and seamless UPS switching (<20ms)
• Remote monitoring via mobile app

3. Operation Modes & Load Application

• Daytime: Solar power supplies loads and charges batteries; excess energy can feed into the grid if required.
• Nighttime: Battery discharges to supply loads, supporting full off-grid operation.
• Power Outage: UPS mode ensures uninterrupted power with sub-20ms transfer time.

The system supports a wide range of loads including three-phase air conditioning, lighting, communication base stations, surveillance equipment, and network infrastructure.

4. Installation & Maintenance

Installation Highlights:

• Wall-mounted inverters, clearly labeled three-phase outputs (L1/L2/L3)
• Floor-standing battery units with reinforced wiring and surge protection
• Clean cable management with fire-resistant conduit and busbar distribution

Safety Measures:

• Each battery features a built-in BMS with automatic fault isolation
• SPD protection and PE grounding implemented
• Centralized battery monitoring software via RS232

O&M Recommendations:

• Quarterly terminal tightening inspection
• Monitor cell voltage variations via BMS platform
• Dust removal from fan inlets to prevent thermal derating

5. System Performance Summary

6. Value Highlights

• Designed for harsh Middle Eastern climate
• Three-phase compatibility ensures broader application range
• Compact and lightweight lithium battery for easy indoor deployment
• Dual-layer remote and local monitoring systems
• Scalable battery architecture supports up to 15 units in parallel