24V Battery Runtime Calculator

Need to know how long your 24V battery system will last? This 24V Battery Runtime Calculator helps you estimate runtime based on your battery capacity and load requirements.

The 24V Battery Runtime Calculator helps you determine how long your battery system will operate under specific loads. This tool is essential for:

• Solar power systems
• RV and marine applications
• Backup power systems
• Industrial equipment
• Mobile power solutions

Basic Concepts

Key Terms

Battery Capacity (Ah)

• Measured in Amp-hours (Ah)
• Indicates total energy storage
• Example: 100Ah battery can supply 5 amps for 20 hours

Load Current (A)

• Measured in Amperes (A)
• Current drawn by your devices
• Example: LED light might draw 0.5A

Depth of Discharge (DoD)

• Maximum recommended discharge percentage
• Affects battery lifespan
• Typical ranges:
  • Lead Acid: 50%
  • AGM/Gel: 80%
  • Lithium: 90%

Battery Types

Lead Acid

• Efficiency: 85%
• Cost: Low
• Lifespan: 3-5 years
• DoD: 50%

AGM (Absorbed Glass Mat)

• Efficiency: 90%
• Cost: Medium
• Lifespan: 4-7 years
• DoD: 80%

Gel

• Efficiency: 90%
• Cost: Medium-High
• Lifespan: 5-8 years
• DoD: 80%

Lithium (LiFePO4)

• Efficiency: 95%
• Cost: High
• Lifespan: 10+ years
• DoD: 90%

How to Use the 24V Battery Runtime Calculator?

Step 1: Enter Battery Capacity

Example:
100Ah battery = Enter "100"
200Ah battery = Enter "200"

Step 2: Enter Load Current

Example:
5A load = Enter "5"
2.5A load = Enter "2.5"

Step 3: Set Depth of Discharge

Example:
80% DoD = Enter "80"
50% DoD = Enter "50"

Step 4: Select Battery Type

• Choose based on your battery chemistry
• Affects efficiency calculations

Understanding Results

Runtime Display

• Shows hours and minutes
• Considers efficiency losses
• Accounts for DoD limits

Available Capacity

• Usable amp-hours
• Accounts for DoD
• Includes efficiency factor

Power Usage

• Shows watts (W)
• Calculated as: Current × 24V
• Helps with power planning

Application Examples

RV System

Battery: 200Ah AGM
Load: 10A
DoD: 80%
Runtime ≈ 15.2 hours

Solar Backup

Battery: 300Ah Lithium
Load: 15A
DoD: 90%
Runtime ≈ 17.1 hours

Marine System

Battery: 150Ah Gel
Load: 8A
DoD: 75%
Runtime ≈ 12.7 hours

Best Practices

1. Battery Selection

• Choose based on:
  • Budget
  • Space constraints
  • Environmental conditions
  • Required lifespan

2. Load Management

• Calculate total loads
• Include surge currents
• Consider periodic loads
• Plan for future expansion

3. System Design

• Include safety margins
• Consider temperature effects
• Plan for maintenance
• Monitor system performance

4. Maintenance Tips

• Regular voltage checks
• Clean connections
• Temperature monitoring
• Capacity testing

FAQ

Q: How accurate is the calculator?

A: Accuracy depends on input accuracy and real-world conditions. Results are estimates.

Q: Should I always use maximum DoD?

A: No, lower DoD increases battery life but requires larger capacity.

Q: How does temperature affect runtime?

A: Lower temperatures reduce capacity:

• At 32°F (0°C): -20% capacity
• At 68°F (20°C): 100% capacity
• At 113°F (45°C): Reduced lifespan

Quick Reference Table

Battery Type	Recommended DoD	Efficiency	Typical Lifespan
Lead Acid	50%	85%	3-5 years
AGM	80%	90%	4-7 years
Gel	80%	90%	5-8 years
Lithium	90%	95%	10+ years

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