Battery Round Trip Energy Loss
Use this battery round trip energy loss tool when you have measured values for charged, discharged. It applies a transparent mathematical relationship to those values to return an answer in kWh. Unlike a prediction or recommendation, this is a calculation from your inputs. Do not mix charging and discharging from different cycles. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for charged, discharged.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported kWh quantity against your own data and the limitations below.
Formula for Battery Round Trip Energy Loss
kWh = charged-discharged. Inputs are expressed in the units shown by the labels.
- This uses a direct energy relationship and does not retrieve remote data, forecasts or individual account information.
- Do not mix charging and discharging from different cycles.
Worked examples
Worked example — Battery Round Trip Energy Loss
Enter Charged = 20, Discharged = 17.5.
Apply charged-discharged.
Calculated value: approximately 2.5 kWh.
Understanding the result
The example produces about 2.5 kWh; this is a mathematical output for the example inputs, not an observed result for your project.
Do not mix charging and discharging from different cycles.
Important notes
Do not mix charging and discharging from different cycles.
Use values from the same measurement period or physical system. The result is in kWh and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does Battery Round Trip Energy Loss calculate?
It converts charged, discharged into a quantity measured in kWh using the stated formula.
Which assumption matters most?
Do not mix charging and discharging from different cycles.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.