1. What is the 100 Amp Hour Battery Calculator?

The 100 Amp Hour Battery Calculator estimates how long a 100 amp-hour battery will last powering a specific load, taking into account battery voltage and system efficiency.

2. How Does the Calculator Work?

The calculator uses the runtime formula:

Where:

• 100 Ah — Battery capacity (amp-hours)
• Battery Voltage — Nominal voltage of battery (e.g., 12V, 24V)
• Efficiency — System efficiency (typically 0.7-0.95)
• Load Power — Power consumption of connected devices (watts)

Explanation: The equation converts amp-hours to watt-hours, accounts for system losses, then divides by load power to determine runtime.

3. Importance of Runtime Calculation

Details: Accurate runtime estimation helps in sizing battery systems, planning power usage, and ensuring continuous operation of critical systems.

4. Using the Calculator

Tips: Enter battery voltage (typically 12V, 24V, or 48V), system efficiency (default is 0.85), and load power in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical efficiency value?
A: For lead-acid batteries, 0.85 is common. Lithium systems may reach 0.95. Include inverter losses if applicable.

Q2: Can I use this for batteries with different capacities?
A: The calculator is specifically for 100Ah batteries. For other sizes, multiply result by (YourCapacity/100).

Q3: Why is voltage important in the calculation?
A: Voltage determines the total energy (watt-hours) available in the battery (Ah × V = Wh).

Q4: Should I fully discharge my battery?
A: No. Lead-acid batteries shouldn't be discharged below 50% regularly. Lithium can go deeper but has limits too.

Q5: How accurate is this estimate?
A: It provides theoretical maximum. Real-world factors like temperature, age, and discharge rate affect actual runtime.