Battery Backup Calculator
Calculate optimal battery capacity and backup duration for your power needs
Appliances & Load
Total Load: 625 watts
Daily Energy: 5,100 Wh
Battery Configuration
Higher DoD = Better utilization but shorter battery life
Config: Lithium, 48V, 80% DoD
Battery Requirements
Capacity (Ah)
65.1 Ah
Capacity (kWh)
3.13 kWh
Number of Batteries
1 batteries
(200Ah standard batteries)
System Specifications
Total Load
625 W
Backup Duration
4 hours
Daily Energy Consumption
5,100 Wh
Cost & Weight
Estimated Battery Cost
₹78,125
₹25,000/kWh
Total Weight
31.25 kg
Quick Summary
Total Appliances:4
Total Load:625 W
Backup Hours:4 hours
Battery Type:lithium
Battery Capacity:3.13 kWh
Total Cost:₹78,125
System Breakdown
Proportional representation of battery system requirements
How Battery Backup Calculation Works
Load Calculation
Total load is calculated by summing up all appliances: (Wattage × Quantity) for each appliance. Your current total load is 625 watts.
LED Light: 10W × 5 = 50W
Fan: 75W × 3 = 225W
TV: 150W × 1 = 150W
Refrigerator: 200W × 1 = 200W
Energy Requirement
Energy needed for backup = Total Load × Backup Hours = 625W × 4h = 2,500Wh
Adjusted for 80% DoD: 2,500Wh ÷ 80% = 3,130Wh
Battery Capacity
Battery capacity in Ah = Energy (Wh) ÷ System Voltage (V) = 3,130Wh ÷ 48V = 65.1Ah
Number of 200Ah batteries: 65.1Ah ÷ 200Ah = 1 batteries
Cost & Weight
Lithium battery cost: 3.13kWh × ₹25,000/kWh = ₹78,125
Weight: 3.13kWh × 10kg/kWh = 31.25kg
Pro Tips for Solar Battery Systems
Battery Selection:
- • Lithium: Higher cost, longer life, 80% DoD
- • Lead Acid: Lower cost, shorter life, 50% DoD
- • 48V systems: More efficient for larger loads
- • Consider temperature effects on capacity
System Optimization:
- • Add 20% safety margin to calculations
- • Use energy-efficient appliances
- • Consider peak vs continuous loads
- • Plan for seasonal variations
Current System Summary:
Load: 625W
Backup: 4 hours
Battery: lithium 3.13kWh
Cost: ₹78,125
Weight: 31.25kg
Batteries: 1 units
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