POWER ELECTRONICS / CALCULATOR
Battery Runtime Calculator
Estimate battery operating runtime hours under continuous DC load considering Peukert effect and depth of discharge (DoD).
Built for Engineering workflows, the Battery Runtime Calculator evaluates Battery Rated Capacity (Ah (Amp Hours)), Nominal Battery Voltage (V (12.8V LiFePO4 / 12V Lead-Acid)), Continuous Load Draw (Watts) using the explicit formula (Runtime (Hours) = (Battery Capacity Ah × Battery Voltage × Usable DoD %) ÷ Device Load Power in Watts). Instead of relying on rules of thumb, you can audit every variable and see how changing Battery Rated Capacity or Max Usable Depth of Discharge (DoD) impacts the final estimated runtime.
Default baseline with Battery Rated Capacity = 100 Ah (Amp Hours) yields 17.1 hours (estimated runtime).
MATHEMATICAL FORMULA
Runtime (Hours) = (Battery Capacity Ah × Battery Voltage × Usable DoD %) ÷ Device Load Power in Watts
Computed directly from Battery Rated Capacity (Ah (Amp Hours)), Nominal Battery Voltage (V (12.8V LiFePO4 / 12V Lead-Acid)), Continuous Load Draw (Watts) with zero server latency so Engineering practitioners can verify how Battery Rated Capacity drives estimated runtime.
Worked Real-World Example
Suppose you are running a Battery Runtime Calculator calculation with default baseline inputs: Battery Rated Capacity = 100 Ah (Amp Hours), Nominal Battery Voltage = 12.8 V (12.8V LiFePO4 / 12V Lead-Acid), Continuous Load Draw = 60 Watts, Max Usable Depth of Discharge (DoD) = 80 % (80-90% Lithium / 50% AGM). Applying the equation (Runtime (Hours) = (Battery Capacity Ah × Battery Voltage × Usable DoD %) ÷ Device Load Power in Watts), the calculator yields a primary result of 17.1 hours (estimated runtime), along with secondary breakdown details of 1,024 usable Watt-hours (1,024 minutes under continuous 60W load).
Assumptions, Tolerances & Limitations
Electrical, mechanical, and fabrication equations assume steady-state operating temperatures and homogeneous material properties. For NEC branch circuits and feeder sizing, account for ambient temperature derating, conduit fill, and continuous-load 125% multipliers. Specifically for Battery Runtime Calculator, ensure Battery Rated Capacity and Max Usable Depth of Discharge (DoD) are measured in consistent Ah (Amp Hours) before finalizing orders or specifications.
Methodology & Standards: Formulated for Engineering reference using (Runtime (Hours) = (Battery Capacity Ah × Battery Voltage × Usable DoD %) ÷ Device Load Power in Watts) across Battery Rated Capacity (Ah (Amp Hours)), Nominal Battery Voltage (V (12.8V LiFePO4 / 12V Lead-Acid)), Continuous Load Draw (Watts).
STEP-BY-STEP GUIDE
How to use the Battery Runtime Calculator
Use the three steps below to configure Battery Rated Capacity (Ah (Amp Hours)), Nominal Battery Voltage (V (12.8V LiFePO4 / 12V Lead-Acid)), Continuous Load Draw (Watts) and interpret the estimated runtime for Battery Runtime Calculator.
Start by setting Battery Rated Capacity = 100 Ah (Amp Hours) and related Engineering inputs.
Confirm unit consistency across Battery Rated Capacity (Ah (Amp Hours)), Nominal Battery Voltage (V (12.8V LiFePO4 / 12V Lead-Acid)), Continuous Load Draw (Watts).
Compare the computed 17.1 hours baseline against your project requirements.
FREQUENTLY ASKED QUESTIONS
What is the primary calculation performed by the Battery Runtime Calculator?
The Battery Runtime Calculator calculates Estimate battery operating runtime hours under continuous DC load considering Peukert effect and depth of discharge (DoD). according to the verified formula Runtime (Hours) = (Battery Capacity Ah × Battery Voltage × Usable DoD %) ÷ Device Load Power in Watts.
How do I ensure maximum accuracy with this calculator?
Always measure actual physical dimensions and parameters rather than nominal estimates, keep units consistent, and include recommended safety or waste allowances.
Can I copy and share the calculation results?
Yes. Click the 'Copy result' button to copy the complete formatted calculation and input record directly to your clipboard for job estimates or documentation.