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