Mining Vehicle & Underground Equipment worked example
Battery-Electric Retrofit Payback with retrofit capital investment of 62,500 $: a worked example
What does the result look like when retrofit capital investment reaches 62,500 $? The full calculation is worked below with real intermediate numbers. Use it when battery-electric retrofit payback in mining vehicle and underground equipment is being compared against another mining vehicle and underground equipment project for the same budget.
The inputs for this scenario
- Retrofit capital investment: 62,500 $ (raised for this scenario; the documented default is 25,000)
- Annual diesel and operating savings: 18,000 $ / yr (unchanged)
- Annual battery support and maintenance cost: 2,500 $ / yr (unchanged)
Working through the calculation
- Applying the documented formula (Net annual battery-electric retrofit payback savings = annual battery-electric retrofit payback savings - annual battery-electric retrofit payback support cost) to the inputs above produces each figure below.
- At this operating point the engine returns 4.03 yr for battery-electric retrofit payback payback period, the number this scenario is built around.
- At this operating point the engine returns 15,500 $ / yr for net annual battery-electric retrofit payback savings.
- At this operating point the engine returns 62,500 $ for battery-electric retrofit payback investment.
- At this operating point the engine returns 15,000 $ for five-year net battery-electric retrofit payback value.
How this compares with the baseline
- Against the tool's baseline example, where retrofit capital investment sits at 25,000 $ and the headline result is 1.61 yr, this scenario comes in 150% above the baseline at 4.03 yr.
- A figure at this level is achievable when retrofit capital investment is genuinely sustained, not just peaked for a shift. It is a simple payback that ignores the time value of money, battery replacement cost partway through life, and savings that escalate with rising diesel or ventilation-power prices.
Results at a glance
- Battery-electric retrofit payback payback period: 4.03 yr (headline result)
- Net annual battery-electric retrofit payback savings: 15,500 $ / yr
- Battery-electric retrofit payback investment: 62,500 $
- Five-year net battery-electric retrofit payback value: 15,000 $
Run it with your numbers
- Every input above is editable in the live Battery-Electric Retrofit Payback calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.