Inverter & IPS Battery Backup Hours Calculation in Nepal: Watts, Ah & Sizing
Maintaining uninterrupted electrical power for Wi-Fi routers, LED lights, laptops, and televisions during grid power cuts requires a properly sized Inverter and Instant Power Supply (IPS) system. Sizing your tubular battery Ampere-Hour (Ah) capacity prevents premature battery drain.
- Total electrical load is determined by summing the wattage of all simultaneous appliances.
- Battery backup formula: Backup Hours = (Battery Voltage * Battery Ah * Efficiency Factor) / Total Watt Load.
- Standard inverters operate at approximately 80% electrical efficiency due to DC-to-AC conversion loss.
- Tubular lead-acid batteries deliver longer cycle lifespans (3 to 5 years) compared to standard flat-plate automotive batteries.
Common Household Appliance Wattage Chart in Nepal
Summing electrical loads running simultaneously during a power outage:
| Household Appliance | Typical Power Rating | Quantity in Use | Total Running Load (Watts) |
|---|---|---|---|
| LED Light Bulb (9W) | 9 Watts | 4 Bulbs | 36 Watts |
| Ceiling Fan | 75 Watts | 2 Fans | 150 Watts |
| Wi-Fi Fiber Router & ONU | 15 Watts | 1 Set | 15 Watts |
| 32-inch LED Television | 50 Watts | 1 TV | 50 Watts |
| Laptop Computer Charging | 65 Watts | 1 Laptop | 65 Watts |
| Total Combined Load | Sum of All Devices | Typical Home Run | 316 Watts |
Step-by-Step Battery Backup Hours Calculation
Consider a standard 12V 150Ah tubular battery running a 300-Watt load at 80% efficiency: Total Stored Energy = 12 Volts * 150 Ah = 1,800 Watt-hours. Usable Energy (with 0.8 efficiency) = 1,800 * 0.8 = 1,440 Watt-hours. Backup Time = 1,440 Watt-hours / 300 Watts = 4.8 Hours of continuous power.
Final Thoughts
Sizing your inverter setup accurately ensures dependable home emergency power. Calculate your exact backup time and recommended battery size using our Inverter Battery Backup Calculator.
Ready to calculate your exact numbers?
Apply the formulas and laws outlined in this guide directly using our precision calculators.
Open Calculate Inverter Battery Backup Hours & Size