24kW 20kWh solar systems project study- 550W PV panels matched with 8kW Inverter and 5kWh LiFePO4 battery solutions

1. Core System Configuration & Performance Advantages

In the context of global energy transition and frequent natural disasters, integrated solar-plus-storage systems are becoming the preferred solution for residential and commercial users. These systems leverage high-efficiency PV modules, smart inverters, and long-life lithium batteries for seamless energy management.

This MOTOMA case study features:

• 3 × 8kW inverters (total output: 24kW)
• 4 × 5.12kWh M87UC lithium batteries LiFePO4 (total capacity: 20.48kWh)
• High-efficiency 550W PV modules

Together, these components create a reliable, around-the-clock power supply solution.

2. Accurate Sizing of Load and PV Panels

2.1 Load Compatibility Analysis

• Inverter Output Capacity: The 24kW inverter system supports peak loads such as air conditioners, pumps, and motors. It can handle multiple devices simultaneously, e.g., 3kW air conditioner, 0.5kW lighting, and 0.3kW computers—ideal for homes or small commercial operations.
• Battery Backup Capacity: The 20.48kWh storage system can sustain essential loads (e.g., refrigerators, lighting, routers) for 8–10 hours during grid outages. Coupled with solar recharging, it provides reliable off-grid autonomy.

2.2 PV Panel Sizing Calculation (550W Each)

Formula:

N = (Edaily × ηsystem) / (Ppanel × Hpeak × ηpanel)
  

Parameter Definitions:

• E_daily: Daily energy consumption (assumed: 30kWh)
• η_system: System efficiency (85%)
• P_panel: Power per PV panel (550W)
• H_peak: Average daily peak sun hours (5h)
• η_panel: Panel efficiency (90%)

Calculation:

N = (30 × 0.85) / (0.55 × 5 × 0.9) ≈ 10.3 panels

Conclusion: A system with 11 × 550W panels is recommended, incorporating redundancy for cloudy days.

3. Professional System Design & Installation Guidelines

3.1 PV Array Configuration

• Electrical Matching: Each panel’s Voc ≈ 49.5V, Vmp ≈ 41V. Match strings to inverter’s MPPT range (100–500V DC).
• Recommended Topologies: 2 strings × 6 panels or 3 strings × 4 panels.
• Installation Tips: Tilt angle = latitude ±5°, spacing ≥ 0.5m.

3.2 Battery Storage Installation

• Parallel Connection: Equal-length cables (≤5% impedance difference), proper ventilation (≥20cm spacing), support ≥200kg.
• Temperature Control: 0–45°C charging, -20–60°C discharging. Use sensors in enclosed areas.

3.3 Inverter & System Integration

• Grid/Off-Grid Switching: Anti-backfeed relay for seamless transition.
• Smart Monitoring: Connect via RS485/CAN to MOTOMA Energy App for real-time monitoring.

4. Key Advantages & Customer Value

• Optimized LCOE: High-power PV reduces installation cost, fewer panels needed, lower BOS costs.
• Long-Life Battery: M87UC supports 6,000+ cycles @ 80% DoD, exceeding 16 years of use.
• Compact & Safe: 70% volume reduction vs. lead-acid, IP55-rated, triple BMS protection.

5. Application Scenarios & Investment Return

• Residential: Self-consumption + TOU optimization; 5–7 year ROI.
• Commercial: Avoids blackout losses (e.g., ¥2,000/day for small shops).
• Backup Power: 20.48kWh + solar supports hospitals, data centers—ISO 9001 compliant.

Contact MOTOMA Engineers Today for a tailored solar-plus-storage solution!

Keywords: 550W PV panel, 24kW inverter, 20kWh battery storage, off-grid system, MOTOMA energy solution