Batteries
Depth of Discharge Calculator
Depth of Discharge converts the entered electrical measurements into depth of discharge. Use it to the depth of discharge calculation.
Enter values for depth of discharge
Use one consistent electrical operating case for all fields.
How Depth of Discharge works
This worksheet evaluates DoD = removed capacity ÷ rated capacity × 100. Depth of Discharge uses Capacity removed, Rated capacity to report Depth of discharge.
With the loaded values, depth of discharge evaluates to 60.00%. Hold the remaining entries steady while testing an uncertain input. Use Battery Voltage Sag Calculator.
Inputs for Depth of Discharge
Capacity removed and Rated capacity belong to Depth of Discharge. Keep source units with capacity removed.
The sample case is a worked example, not a design target.
- Capacity removed
- Example entry: 60 Ah.
- Rated capacity
- Example entry: 100 Ah.
Reading the Depth of Discharge result
This output represents Depth of Discharge.
Compare the output with equipment limits and the applicable design margins.
Measurement and units
Battery calculations depend on chemistry, temperature, age, discharge rate, and the limits of the battery management system. Check prefixes on capacity removed.
Do not compare cases built from different unit prefixes or measurement locations.
Limits of this calculation
Capacity ratings depend on test rate and temperature.
Only the stated inputs participate in this simplified model. Unentered effects remain outside Depth of Discharge.
A useful Depth of Discharge comparison
Record depth of discharge before testing a different capacity removed value. Continue to Battery C-Rate Calculator for discharge C-rate.
Document the alternate capacity removed source.
Questions about Depth of Discharge
What does Depth of Discharge calculate?
Depth of Discharge reports depth of discharge.
Can Capacity removed be zero?
For Depth of Discharge, measure any zero capacity removed directly.
Why can depth of discharge differ from measurement?
Capacity ratings depend on test rate and temperature. Recheck capacity removed.