Off-Grid Backup Power Solution: Detailed Analysis of Residential Battery Energy Storage Systems

Off-Grid Backup Power Solution: Detailed Analysis of Residential Battery Energy Storage Systems​

​How do traditional households ensure continuous power supply during grid outages?

​Solution Architecture:​​

1. ​Core Components​
• Energy Storage Battery (LiFePO4/LFP)
• Off-Grid Inverter (with Grid-On/Off switching function)
• Intelligent Energy Management System
• PV Charge Controller (MPPT technology)
2. ​System Workflow​
• ​When Grid is Normal:​​
  PV Generation → Home Consumption → Battery Storage → Excess Power Fed to Grid
• ​During Grid Outage:​​
  PV Generation + Battery Discharge → Through Inverter → Powers Critical Loads
3. ​Technical Parameter Comparison​

1. ​Intelligent Management Features​
• Load Priority Setting (e.g., Medical Equipment > Lighting > AC)
• Automatic Full Reserve Charge upon Typhoon Warning
• Smart Time-of-Use (TOU) Tariff Arbitrage
• Remote Monitoring via Mobile App
2. ​Typical Configuration Plan (80 sqm Residence):​​
• 10kWh Storage Battery
• 5kW PV Array
• 6kW Hybrid Inverter
• Supports Basic Loads for 8-12 Hours
3. ​Safety Protection System​
• UL1973 Certified Battery Pack
• IP65 Protection Rating
• 3-Level BMS (Battery Management System) Protection
• Anti-Islanding Protection Device
• Dedicated Fire Venting Channel

​Return on Investment (ROI) Analysis​

• ​Initial Investment:​​ 12,000−12,000 - 12,000−18,000
• ​Annual Benefit Components:​​
• TOU Tariff Savings: $320
• Reduced Outage Losses: $600+
• Government Subsidy: $1,500 (varies by region)
• ​Payback Period:​​ 7-10 Years

​Real-World Case​
During a 2023 California storm, a residence equipped with 20kWh storage:

• Maintained continuous power supply for 72 hours
• Ensured operation of medical ventilator
• Reduced food spoilage losses by over $800
• Kept security system fully operational