1. Appearance Difference: A single rack vs. multiple stacked modules – the difference is immediately apparent. 2. Expandability Comparison: Stacked racks allow for the addition of battery modules, while integrated racks require parallel connection of the entire unit. 3. Maintenance Experience: With stacked racks, only faulty modules need to be replaced; with integrated racks, the entire unit is typically repaired. 4. Space Occupancy: Integrated racks save space; stacked racks require higher ceiling height. 5. Price Difference: Stacked racks are 10%-20% more expensive, but have lower long-term expansion costs. 6. Purchase Recommendation: Choose integrated racks if you don't plan to expand in the near future; choose stacked racks if you have expansion needs.

1. Current Electricity Prices in Africa: Lagos: $0.3 per kilowatt-hour, 200 days/year of power rationing; during power outages, diesel generators cost $8 per liter. 2. Urban Middle-Class Families: A 6kW hybrid system saves approximately $4,200 annually in electricity and diesel costs, with a payback period of 2 years. 3. Industrial and Commercial Users: A 30kW industrial and commercial system saves approximately $37,400 annually, with a payback period of less than 1 year. 4. Remote Rural Families Without Electricity: A 1kW microgrid saves approximately $360 annually in kerosene charging costs per household, with a payback period of 1 year. 5. Four Factors Affecting Cost Savings: Electricity Price, Sunlight Radiance, Self-Consumption Ratio, System Quality 6. Conclusion: Solar power pays off fastest in high-electricity-price regions of Africa; industrial and commercial users see the greatest value.