How do you calculate battery-electric retrofit payback?

Subtract annual support cost from annual savings to get net savings, then divide the investment by that net figure. With $25,000 invested, $18,000 saved and $2,500 support, net savings are $15,500 and payback is $25,000 / $15,500 = about 1.61 years.

Why subtract the support cost instead of using gross savings?

Because a battery conversion adds real recurring costs - charging energy, pack maintenance, battery-management support. Using the gross $18,000 would show a faster payback than reality; the net $15,500 reflects what actually lands on the bottom line each year.

What is a good payback period for a mining vehicle retrofit?

Underground, where diesel also drives huge ventilation costs, paybacks under 2-3 years are common and attractive; 1.61 years here is strong. Surface machines with cheap ventilation often pay back slower, so judge against your site's diesel and ventilation economics.

What does the five-year net value mean?

It is net annual savings times five, minus the investment - here $15,500 x 5 - $25,000 = $52,500. It shows the cumulative benefit over a typical evaluation horizon, useful for ranking retrofits against other capital projects.

Does this account for battery replacement during the life?

No - it assumes steady net savings. If the pack needs replacement before five years, add that as a future cost; the simple payback and five-year value here do not include a mid-life battery swap.

Should I use simple payback or a discounted method?

Simple payback is fine for a quick screen and for ranking fleet units, as here. For a final capital decision, layer in NPV or IRR so the time value of money and escalating diesel savings are captured.

Mining Vehicle & Underground Equipment calculator

Battery-Electric Retrofit Payback Calculator

Battery-electric retrofit payback tells you how many years it takes for a diesel-to-battery conversion on an underground or surface mining vehicle to pay back its conversion cost out of the savings it generates. The savings are real and large underground - eliminated diesel fuel, slashed ventilation and cooling load, lower engine maintenance - but they are partly offset by new costs for battery support, charging infrastructure and pack maintenance. Mine engineers, fleet managers and capital planners use this to compare a retrofit against a diesel rebuild or a new battery machine, and to rank which units in a fleet convert first. By netting the annual support cost against gross savings, it gives an honest payback rather than the optimistic fuel-only number that overstates the case.

What this calculator does

Estimate battery-electric retrofit payback for mining vehicle and underground equipment using production-ready inputs so teams can screen a capital project before a detailed business case.
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.
Computes the payback period in years for a battery-electric retrofit by dividing the capital investment by the net annual savings, which is gross savings minus annual support cost, and also returns the five-year net value.

Formula used

Net annual battery-electric retrofit payback savings = annual battery-electric retrofit payback savings - annual battery-electric retrofit payback support cost
Battery-electric retrofit payback payback period = battery-electric retrofit payback investment ÷ net annual savings

Inputs explained

Retrofit capital investment:
Annual diesel and operating savings:
Annual battery support and maintenance cost:

How to use the result

Use it when building the business case for converting a mining vehicle to battery-electric, or ranking which fleet units to retrofit first.
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.

Current U.S. benchmarks

U.S. light vehicles sell at a 16.9 million annual rate (BEA, Jun 2026), up 4.1% from a year earlier, the volume signal for automotive supply chains.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate battery-electric retrofit payback? Subtract annual support cost from annual savings to get net savings, then divide the investment by that net figure. With $25,000 invested, $18,000 saved and $2,500 support, net savings are $15,500 and payback is $25,000 / $15,500 = about 1.61 years.
Why subtract the support cost instead of using gross savings? Because a battery conversion adds real recurring costs - charging energy, pack maintenance, battery-management support. Using the gross $18,000 would show a faster payback than reality; the net $15,500 reflects what actually lands on the bottom line each year.
What is a good payback period for a mining vehicle retrofit? Underground, where diesel also drives huge ventilation costs, paybacks under 2-3 years are common and attractive; 1.61 years here is strong. Surface machines with cheap ventilation often pay back slower, so judge against your site's diesel and ventilation economics.
What does the five-year net value mean? It is net annual savings times five, minus the investment - here $15,500 x 5 - $25,000 = $52,500. It shows the cumulative benefit over a typical evaluation horizon, useful for ranking retrofits against other capital projects.
Does this account for battery replacement during the life? No - it assumes steady net savings. If the pack needs replacement before five years, add that as a future cost; the simple payback and five-year value here do not include a mid-life battery swap.

Last reviewed 2026-05-12.