Battery Storage Sizing Guide
Complete guide to sizing your battery storage system. Learn about energy consumption analysis, battery technology comparison, and backup duration calculations for optimal performance.
Energy Consumption Analysis
Proper battery sizing starts with understanding your household's energy consumption patterns. This analysis forms the foundation for determining the optimal battery capacity for your needs.
Daily Usage
Average daily kWh consumption from your electricity bill
Peak Periods
High consumption times (typically 16:00-19:00)
Essential Loads
Critical appliances for backup power scenarios
Battery Technology Comparison
Lithium Iron Phosphate (LiFePO4)
Best for: Long-term reliability, daily cycling, and maximum usable capacity.
Lithium Nickel Manganese Cobalt (NMC)
Best for: High energy density applications and compact installations.
Depth of Discharge Impact
Understanding depth of discharge (DoD) is crucial for battery sizing. DoD represents how much of the battery's capacity can be safely used without damaging the battery or reducing its lifespan.
Conservative
Maximum battery life, minimal usable capacity
Balanced
Good balance of capacity and longevity
Maximum
Full capacity utilization (LiFePO4 only)
Sizing Formula
Required Battery Capacity = Daily Energy Need ÷ Depth of Discharge
Example: 15 kWh daily need ÷ 0.95 DoD = 15.8 kWh battery capacity required
Backup Duration Calculations
Essential Load Backup Scenarios
1-Day Backup (Essential Loads Only)
Recommended: 7-8 kWh battery capacity (with 90% DoD)
3-Day Backup (Extended Outage)
Recommended: 24-25 kWh battery capacity (with 90% DoD)
5-Day Backup (Full Independence)
Recommended: 45-50 kWh battery capacity (with 90% DoD)
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