1. What is Battery Backup Time?

The battery backup time is the duration for which an inverter battery can power connected devices before needing to be recharged. It depends on the battery's capacity, voltage, efficiency, and the power consumption of the connected load.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( \text{Battery Capacity} \) — Storage capacity in amp-hours (Ah)
• \( \text{Battery Voltage} \) — Nominal voltage of the battery (V)
• \( \text{Efficiency} \) — Battery/inverter efficiency factor (typically 0.85-0.95)
• \( \text{Load} \) — Total power consumption of connected devices (W)

Explanation: The formula calculates how long the battery's stored energy (in watt-hours) can sustain the given load, accounting for system inefficiencies.

3. Importance of Backup Time Calculation

Details: Knowing your backup time helps in sizing battery systems appropriately for power outages, ensuring critical devices remain powered for required durations.

4. Using the Calculator

Tips: Enter battery capacity in Ah, voltage in V, efficiency (typically 0.85-0.95), and load in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical efficiency factor?
A: Most inverter-battery systems have efficiency between 85-95% (0.85-0.95 in the calculator).

Q2: How can I increase backup time?
A: You can increase battery capacity, reduce load, or use more efficient equipment.

Q3: Does battery age affect backup time?
A: Yes, as batteries age their capacity decreases, reducing backup time.

Q4: Should I consider depth of discharge?
A: Yes, most batteries shouldn't be discharged below 50% for optimal lifespan.

Q5: How accurate is this calculation?
A: It provides a good estimate, but actual backup time may vary based on temperature, battery condition, and load variations.