22kW 30kWh solar energy storage systems commercial project in Yemen 11kW inverter and 15kWh LiFePO4 battery

Consistent and reliable clean energy systems have become essential in regions with unstable power supplies. This case study demonstrates MOTOMA‘s successful deployment of a high-performance solar energy storage system in commercial applications, providing users with stable, efficient, and eco-friendly power solutions.

 Installation Steps & Key Considerations

• Site Assessment: Ensure rooftop or ground stability, optimal PV orientation (south-facing with a 10–20° tilt).
• Electrical Design: Match inverter capacity, battery sizing, and PV array with user‘s actual power demands.
• Grounding Layout: Plan low-resistance grounding (< 5Ω), equipotential bonding, and surge protection.

Installation Workflow

1. Install PV panels (20 × 550W), connect series arrays into the inverter MPPT input.
2. Mount two Axpert Ultra TWIN 11K inverters on the wall, wire AC/DC connections.
3. Connect two 15kWh LiFePO₄ batteries, verify BMS settings, and parallel config.
4. Configure communications via RS485/WiFi; integrate with remote monitoring system.
5. Perform inverter parallel sync setup; test AC output sharing and load response.
6. Finalize insulation, polarity check, torque inspection, and trial run verification.

 System Topology

This is a standalone off-grid solar+storage configuration with optional grid backup. Each inverter manages its own battery and PV input:

      [PV Array] ─┬──> [MPPT Input] ──┐
                  │                  │
                  └──> [Inverter 1] ─┬──> AC Output 1 → Load 1 (Lights, TV)
                                     │
      [Battery 1] ───────────────────┘

      [PV Array] ─┬──> [MPPT Input] ──┐
                  │                  │
                  └──> [Inverter 2] ─┬──> AC Output 2 → Load 2 (AC, Pumps)
                                     │
      [Battery 2] ───────────────────┘
    

 Safety Guidelines

• DC Side: Include breakers, anti-reverse diodes, surge protectors.
• AC Side: GFCI, SPD, and isolation switches must be installed.
• Grounding: Ensure common grounding for PV frame, battery, and inverter casing.
• BMS Monitoring: Actively track battery voltage, SOC, temperature, and current.

Environmental Conditions

• Indoor installation with good airflow; avoid direct sunlight on batteries.
• Leave >20cm clearance for inverters to prevent overheating.
• Humidity < 95% recommended; use enclosures in dusty environments.

O&M Recommendations

• Review logs monthly (PV yield, battery cycles).
• Test grounding and SPD every 6 months.
• Use a manual UPS bypass switch for service/maintenance.

 Load Analysis & System Output

• Total PV: 20 × 550W = 11kWp
• Total Storage: 2 × 15kWh = 30kWh
• Estimated Daily Generation: ~55kWh (5 sun hours/day)
• Runtime: Up to 24h on light/moderate loads (15–20kWh/day)

Load Scenarios

• Lighting, fans, fridge: 4–6kWh/day
• AC, water pumps: 8–10kWh/day
• Backup for medical/IT: critical loads via smart bypass/priority modes

Optimization Tips

• Use smart load management: Tier 1 (critical) > Tier 2 (standard) > Tier 3 (optional)
• Set discharge schedules around peak demand times
• Future scalability possible: PV panels and battery packs can be expanded

 Conclusion

This deployment in Yemen highlights MOTOMA’s robust hybrid solution integrating 2 × 11kW inverters and 30kWh LiFePO₄ storage, effectively ensuring 24/7 power supply in off-grid or unstable grid conditions. With intelligent control, long battery life, and flexible topology, it sets a benchmark for decentralized clean energy systems in developing regions.

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