Battery Backup Calculator
Calculate battery backup time for inverter, UPS, solar battery and power backup systems.
⚡ Free Tool
✓ Instant Results
🛡 Accurate Calculations
Calculate Battery Backup Time
Battery Energy
0
Backup Time
0
Load
0
How Battery Backup Time is Calculated
Battery backup time depends on battery voltage, battery capacity (Ah), connected load and system efficiency.
Formula:
Backup Time (Hours) = (Battery Voltage × Ah × Efficiency) ÷ Load
Example Calculation
A 12V 150Ah battery with 300W load and 85% efficiency provides approximately 5.1 hours of backup.
Applications
- Home Inverters
- UPS Systems
- Solar Battery Banks
- Office Backup Systems
Frequently Asked Questions
How long will a 150Ah battery last?
Backup time depends on the connected load. A lower load provides longer backup duration.
What affects battery backup time?
Battery capacity, voltage, efficiency and load consumption all affect backup duration.
Can I increase battery backup time?
Yes. You can increase capacity, reduce load or add additional batteries.