Solar Battery Run Time Calculator

Need to know how long your solar battery system will power your devices? This Solar Battery Run Time Calculator helps you estimate your battery’s run time based on your actual setup.

Just enter your battery specifications (found on your battery or system manual), total power usage of your devices, and preferred depth of discharge. The calculator will show you both theoretical and real-world run times, accounting for typical system losses and efficiency factors.

Battery Capacity (Ah):

Battery Voltage (V):

Total Device Power Usage (Watts):

Maximum Depth of Discharge (%):

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What is a Solar Battery Run Time Calculator?

This calculator helps you determine how long your solar battery system can power your devices, taking into account key factors like battery capacity, voltage, power consumption, and recommended depth of discharge.

Quick Start Guide

Enter:

Battery Capacity (Ah)
Battery Voltage (V)
Device Power Usage (Watts)
Maximum Depth of Discharge (%)

The calculator will show:

Total battery capacity
Usable capacity
Expected run time
Adjusted run time with efficiency losses

Understanding the Inputs

Battery Capacity (Ah)

Measured in Amp-hours
Typically 50-200Ah for home systems
Found on battery specifications

Battery Voltage (V)

Common values: 12V, 24V, 48V
Matches your system configuration
Higher voltage = more efficient for larger systems

Device Power Usage (Watts)

Total power draw of all devices
Add up wattage of all connected devices
Check device labels or specifications

Depth of Discharge (%)

Recommended maximum battery drain
Usually 50% for lead-acid
Up to 80% for lithium batteries

How Calculations Work?

Calculate Total Capacity:
- Watt-hours = Amp-hours × Voltage
Determine Usable Capacity:
- Usable Watt-hours = Total × (Depth of Discharge ÷ 100)
Calculate Run Time:
- Basic Hours = Usable Watt-hours ÷ Device Watts
- Actual Hours = Basic Hours × 0.9 (efficiency factor)

Important Considerations

System Efficiency

Calculator includes 10% efficiency loss
Accounts for inverter losses
Wiring and connection losses
Temperature effects

Real-World Factors

Actual runtime varies with:
- Temperature
- Battery age
- Usage patterns
- System maintenance

Best Practices

Stay within recommended discharge limits
Monitor battery temperature
Regular system maintenance
Size system for your needs

FAQ

Why is my actual runtime shorter?

Temperature effects
Battery age
System inefficiencies
Variable loads

How do I extend runtime?

Reduce power consumption
Add battery capacity
Maintain optimal temperature
Regular maintenance

What affects battery life?

Depth of discharge
Charging patterns
Temperature
Maintenance schedule

Should I include safety margin?

Yes, add 20% capacity for unexpected needs.

Enjoyed this solar battery run time calculator? Then be sure to check out our other lithium battery guides.