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Charging Dock Cycle Time Calculator

Work out charging dock cycle time instantly with clear inputs, formula shown and shareable results.

About Charging Dock Cycle Time Calculator

Charge time is amp-hours to replace divided by charge current, then divided by charge efficiency. The result drives fleet sizing directly: if a robot needs 20% of its cycle on the charger, the fleet must be 20% larger than the mission count suggests — or opportunity charging must be scheduled.

Formula

Charge time

Ah replaced = capacity x depth discharged; time = Ah / charge current / efficiency

Worked example

With the default values below, Charging Dock Cycle Time Calculator returns Charge time of 1.04. Change any input above and every figure here is recalculated in your browser.

Inputs used

Battery capacity
40 Ah
Charge current
25 A
Depth discharged
60 %
Charge efficiency
92 %

Results

Charge time
1.04 h
Charge time
63 min
Amp-hours replaced
24.00 Ah
Charge time as share of a 4 hour mission
26.1% %

Step by step

  1. 1Values used
  2. 2Charge time
  3. 3Charge time= 1.04 h
  4. 4Charge time= 63 min
  5. 5Amp-hours replaced= 24.00 Ah
  6. 6Charge time as share of a 4 hour mission= 26.1 %

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does the last part of a charge take so long?

Constant-current charging ends around 80% state of charge, after which constant-voltage tapering can take as long again for the final 20%.

What is opportunity charging?

Short top-ups during natural idle time, keeping the pack in a mid state of charge. It maximises availability and is gentler on lithium chemistry.

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