Home
Back
Backup Time Formula:
| From: | To: |
The inverter battery backup time is the duration for which your inverter can power your home appliances during a power outage. It depends on your battery capacity, voltage, and the total power consumption of your home.
The calculator uses the backup time formula:
Where:
Explanation: The formula calculates how long a battery can supply power by dividing the total energy stored in the battery (Ah × V) by the power consumption rate (W).
Details: Knowing your backup time helps in proper power management during outages, sizing your battery bank correctly, and preventing unexpected power loss to critical appliances.
Tips: Enter your battery's Ah rating (found on the battery label), its voltage (typically 12V for single battery systems), and your estimated total home power draw in watts. All values must be positive numbers.
Q1: How accurate is this calculation?
A: This provides an estimate. Actual backup time may vary due to battery age, temperature, inverter efficiency (typically 85-95%), and depth of discharge limits.
Q2: Should I consider inverter efficiency?
A: For more accurate results, divide the result by your inverter's efficiency (e.g., for 90% efficient inverter, divide by 0.9).
Q3: How do I calculate my home power draw?
A: Sum the wattage of all appliances you'll run simultaneously during outage, or check your electricity meter for real-time consumption.
Q4: What's a typical backup time for homes?
A: Most home systems aim for 4-8 hours backup, but this depends entirely on your battery capacity and power needs.
Q5: Can I increase my backup time?
A: Yes, by adding more batteries (increasing Ah), using higher voltage systems, or reducing power consumption during outages.