1. What is Battery Runtime Calculation?

The battery runtime calculation estimates how long a battery will last powering a specific electrical load. It's essential for home energy planning, backup power systems, and off-grid applications.

2. How Does the Calculator Work?

The calculator uses the battery runtime equation:

Where:

• Battery Capacity — The total amp-hour rating of the battery
• Voltage — The nominal voltage of the battery system
• Load Power — The total wattage of the electrical load

Explanation: The equation converts battery capacity to watt-hours (Ah × V = Wh) then divides by load power to determine runtime in hours.

3. Importance of Runtime Calculation

Details: Accurate runtime estimation helps in sizing battery banks for home backup systems, solar installations, and emergency power needs.

4. Using the Calculator

Tips: Enter battery capacity in amp-hours (Ah), system voltage in volts (V), and load power in watts (W). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all battery types?
A: This provides theoretical maximum. Real-world runtime may be less due to efficiency losses, temperature, and battery age.

Q2: Should I discharge my battery completely?
A: No. Most batteries have recommended depth of discharge (e.g., 50% for lead-acid) to prolong lifespan.

Q3: How does battery capacity change over time?
A: Capacity degrades with charge cycles. After 500-1000 cycles, capacity may be 80% of original.

Q4: What's typical home battery capacity?
A: Home battery systems range from 5kWh to 20+kWh. A 10kWh battery at 48V is about 208Ah.

Q5: How can I improve runtime?
A: Increase battery capacity, reduce load power, or use more efficient appliances.