Lead-acid to lithium conversion calculator:know the payback in months before you commit
Whether a conversion pays comes down to one very simple equation: fuel saved each day minus the electricity it costs, multiplied by how many days you run in a month, tells you how long it takes to cover the conversion spend. This calculator opens that equation up. Enter daily distance, petrol price, original consumption, electricity price and total conversion cost, and it returns the net saving per vehicle per month and the payback period in months. Everything is computed in your browser — no enquiry required to use it.
verifiedResults are computed from your inputs and the tool’s stated assumptions (26 operating days a month, 32 Wh/km taken at the grid, 85% charging efficiency); the formal quotation and local fuel and power prices govern.
Conversion payback calculator: five inputs, one answer in months
The defaults describe an everyday delivery duty cycle (110 km a day, petrol at $1.45/L, 3.9 L/100km, electricity at $0.17/kWh and a $980 conversion spend). Replace all five with your own numbers and calculate; the panel returns net saving per vehicle per month, payback period, daily petrol cost, daily electricity cost, daily net saving and three-year net retained.
Assumptions and disclaimer: the tool works on 26 operating days a month, 32 Wh/km taken at the grid and 85% charging efficiency. The energy gap is fuel spend minus charging spend only; oil, filters and lead-acid replacement are excluded, and including them makes the real payback shorter. Results are for investment judgement only — the formal quotation and your local fuel and power prices govern, and the conversion cost field should carry your actual quote rather than the default.
The payback formula, and the three levers that move it
There is no black box in the calculator. This is the equation it solves, and why distance, fuel price and power price carry very different weight.
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The formula
Net saving per vehicle per month = (petrol consumption ÷ 100 × daily distance × petrol price − daily distance × 32 Wh/km × electricity price ÷ 85%) × 26 operating days. Payback period in months = conversion cost ÷ net saving per month. Conversion cost sits in the numerator, so the quotation and the specification set the pace directly — on the same route, less spend means a faster payback.
Rule: fix distance and fuel price first, then talk specification - 02route
Lever one: daily distance
Savings scale with distance, so the further the vehicle runs the faster it pays back. On the default inputs, going from 110 km to 140 km a day lifts the monthly saving in step and pulls payback from about 6.8 months to about 5.4 months, roughly 20% shorter. The more it runs, the better the conversion pays — which is why commercial vehicles suit it better than a private commuter bike.
Impact: largest - 03local_gas_station
Lever two: petrol price
Fuel price drives the whole fuel term. At a steady 110 km a day, moving from $1.45/L to $2.00/L shortens payback from about 6.8 months to about 4.8 months — roughly 30% faster; in a cheap-fuel market it stretches just as clearly. Enter the pump price in your own market, not a crude benchmark.
Impact: large - 04bolt
Lever three: electricity price
Power price touches only the small term in the equation: 32 Wh/km taken at the grid, divided by 85% charging efficiency. Moving from $0.10/kWh to $0.30/kWh stretches payback only from about 6.5 months to about 7.6 months — a change on the order of one month. Power price is not the deciding input, but use your real commercial tariff or swap-service fee.
Impact: smallest
Reference payback bands for common duty cycles
The table runs the calculator’s own model across combinations of daily distance and fuel price, at 3.9 L/100km, $0.17/kWh, a $980 conversion spend and 26 operating days a month. It is there to fix the order of magnitude quickly.
| Daily distance | Petrol $1.00/L | Petrol $1.45/L | Petrol $2.00/L |
|---|---|---|---|
| 80 km | 13 – 16 months | 8 – 11 months | 6 – 8 months |
| 110 km | 10 – 12 months | 6 – 8 months | 4 – 6 months |
| 140 km | 7 – 9 months | 5 – 7 months | 3 – 5 months |
The bands fix an order of magnitude — they are not a quotation. Cheaper fuel and shorter daily distances stretch payback; a higher conversion spend stretches it too. Enter your own fuel price, power price, consumption and daily distance in the calculator above, with the conversion cost taken from a real quote, and the number becomes decidable. Use your own typical consumption (operating three-wheelers commonly sit in the 3 – 4 L/100km band, but your vehicle governs).
Specification notice:The figures above are engineering reference values. They may differ with production batch, configuration and actual duty cycle, and the percentages for life, efficiency, availability and coverage are engineering estimates and bench references. Contact us for the detailed specification sheet.
Six questions about the calculator and the payback basis
How exactly is the payback worked out?expand_more
What should I enter in each field?expand_more
How accurate is the result?expand_more
How do I model a battery-only swap instead of a full conversion?expand_more
Which electricity price should I use?expand_more
How long is payback in practice?expand_more
Turn the payback result into a firm quotation
The calculator tells you the payback; the quotation tells you the spend. Send destination port, payload, daily distance and motor rating, and we will model FOB / CIF pricing for the pack and conversion parts, container allocation and the shipping document list.
- Selection advice and pricing within 24 hours on working days
- Sample packs available to prove the duty cycle before you commit to a container
- Vehicle parameters and market-access documents are strictly confidential; NDA available first
Specification notice:The figures above are engineering reference values. They may differ with production batch, configuration and actual duty cycle, and the percentages for life, efficiency, availability and coverage are engineering estimates and bench references. Contact us for the detailed specification sheet.
The vehicle and operating data you submit are used only for this selection and quotation and remain strictly confidential.