1. What is the Battery Inverter Duration Formula?

The Battery Inverter Duration formula calculates how long a battery will last when powering an inverter. It's essential for designing power backup systems and estimating runtime for off-grid applications.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Ah \) — Battery capacity in amp-hours
• \( V \) — Battery voltage
• \( \text{Inverter W} \) — Power consumption of the inverter

Explanation: The formula calculates the total energy stored in the battery (in watt-hours) and divides it by the power consumption of the inverter to determine runtime.

3. Importance of Duration Calculation

Details: Accurate duration estimation is crucial for designing reliable power backup systems, sizing batteries for solar installations, and planning for emergency power needs.

4. Using the Calculator

Tips: Enter the battery capacity in Ah, battery voltage in volts, and inverter power consumption in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for inverter efficiency?
A: No, this is a basic calculation. For more accuracy, divide the result by the inverter efficiency (typically 0.85-0.95).

Q2: What's a typical duration for home backup?
A: For a 100Ah 12V battery powering a 300W load, duration would be about 4 hours under ideal conditions.

Q3: Should I use nominal or actual battery voltage?
A: Use nominal voltage (12V, 24V, 48V etc.) for estimation, though actual voltage varies during discharge.

Q4: How does battery type affect duration?
A: Lead-acid batteries shouldn't be discharged below 50% capacity, while lithium batteries can often discharge 80-100%.

Q5: Can I use this for multiple batteries?
A: For parallel batteries, sum the Ah ratings. For series, sum the voltages while Ah stays the same.