Why do overseas buyers and OEM engineers derive capacity by multiplying motor power by hours, only to see delivered range fall 35% ~ 45% short once the vehicle is in service? This paper breaks down multi-axis dynamic consumption, the safe depth-of-discharge window, 45°C–50°C tropical derating and high-rate climbing retention — and removes the inflated-rating trap entirely.
verifiedAlgorithm library synced to BMS V4.2 · model excludes gearbox mechanical transmission loss (about 6%)
We do not extrapolate from static nameplate data. The TIANQIU cell laboratory runs sustained high-current charge and discharge cycling on both cells and complete packs, capturing full-period energy retention under New Delhi tricycle and Lagos heavy-load duty.
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.
From cell-level high-rate ageing to vehicle-level dynamic load and twelve-market duty cycles, four data sets converge on a capacity figure you can quote against.
Transient pulse temperature rise tested from 0.2C to 3C: polarisation voltage drop is quantified under high-frequency acceleration and braking plus 1.5C continuous discharge, establishing the true deviation between usable Ah and nameplate Ah at high rate.
Reference retention 96.8% at 1C dischargeAn 800kg payload duty cycle reproduces 12° climbing and loaded pull-away transient demand from controller and motor, to calibrate the real Wh/km waveform.
Peak transient 180A / 10s without overheatKalman filter (EKF) SOC calibration removes coulomb-counting drift over long low-speed operation, holding the dashboard SOC estimate within ±3% and eliminating sudden range collapse.
SOC error ≤ 2.8% across the full cycleDuty data from 1,800+ commercial fleets in India and West Africa captures hard braking, high rolling resistance on unpaved roads and 48°C surface temperatures, feeding back into export pack selection parameters.
Live database 04 · 125 ~ 150 km per vehicle per dayRange (km) = [ Enom × DoD × ηc × Kt ] ÷ Ekm. Only once the safe cut-off window, loaded retention and tropical derating are all included does the capacity figure match what the vehicle actually does.
| Model variable | Engineering meaning | Test / calibrated value |
|---|---|---|
| Enom | Nominal stored energy (Ah × Vmid) | Rated standard capacity |
| DoD | Usable depth of discharge (safe threshold) | 88% ~ 90% (over-discharge protection) |
| ηc | Retention at 1C~1.5C transient heavy load | 94.5% ~ 96.0% |
| Kt | Tropical road-surface derating factor (45°C ambient) | 0.91 ~ 0.94 |
| Ekm | Real vehicle consumption per 100km | Wh/km, calculated dynamically from payload |
The model excludes gearbox mechanical transmission loss (about 6%). Calibrated SOC and consumption data can be streamed to a fleet platform over CAN bus for per-vehicle consumption accounting.
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.
Many export-focused vehicle builders chase the cheapest high-Ah pack, then watch delivered range halve. These four physical and engineering losses are the core reason capacity estimates miss.
Some low-cost workshops pass off salvaged storage cells as high-rate motive cells. Storage cells have high internal resistance, so polarisation voltage collapses during pull-away and climbing, tripping BMS under-voltage early and destroying a quarter of usable energy.
TIANQIU response: A-grade, tier-one motive cells only, supplied with factory internal-resistance (≤0.5mΩ) and capacity-consistency certificates.
A lithium pack cannot be discharged to zero. To protect the crystal lattice and secure 2,500 cycles, a commercial BMS sets a minimum cut-off line (10%~12% reserve is recommended). A 100Ah nameplate pack therefore delivers only 88~90Ah.
TIANQIU response: proposals are submitted to vehicle builders on a net usable capacity basis from the outset.
Through the hot season in India, the Middle East and West Africa, radiated surface heat inside the bay routinely exceeds 50°C. Side reactions accelerate inside the cells, while the electronics reduce output to protect themselves and parasitic fan or cooling load rises — range falls measurably.
TIANQIU response: thermally conductive potting and directed airflow hold pack temperature spread within 3°C for stable high-temperature discharge.
Theoretical consumption assumes smooth laboratory rollers. Target markets are muddy, potholed, dense with speed humps and frequently overloaded with 4~6 passengers. The rolling resistance coefficient (an engineering assumption, not a measurement) rises from 0.015 to 0.035 and real consumption per kilometre increases by nearly half.
TIANQIU response: a calibrated dynamic road-resistance compensation coefficient (Cr correction model) is applied from a twelve-market duty-cycle model.
Look up voltage platform, safe capacity and the matching ex-works pack model directly by vehicle platform and operating scenario — moving the capacity basis from nameplate Ah to net usable Ah.
| Vehicle platform and scenario | Recommended voltage platform | Real combined consumption | Standard target range | Recommended safe capacity | Matching TIANQIU pack model |
|---|---|---|---|---|---|
| High-frequency light two-wheeler (E-Scooter / Delivery): riders, couriers, high-turnover swap cabinets | 60V (16S LFP) | 28 ~ 35 Wh/km | 80 ~ 100 km | 60V 50Ah ~ 60Ah | VT-6050-LFP-SWAP |
| Passenger three-wheeler taxi (E-Rickshaw, India / Bangladesh): 4-5 passengers, frequent stops, 120km per day | 48V / 51.2V (16S) | 55 ~ 68 Wh/km | 100 ~ 120 km | 51.2V 100Ah ~ 120Ah | VT-48100-AIS156-MAX |
| African passenger tricycle (Keke Napep, typical West African duty): rough roads, 45°C heat, high-speed cruising | 60V / 72V platform | 65 ~ 80 Wh/km | 110 ~ 130 km | 60V / 72V 120Ah ~ 140Ah | VT-72130-TROPICAL-HD |
| Heavy commercial cargo tricycle (Cargo 3-Wheeler): 800kg~1000kg rated payload, high torque, steep climbs | 72V (24S LFP) | 95 ~ 125 Wh/km | 90 ~ 110 km | 72V 160Ah ~ 200Ah | VT-72180-CARGO-PRO |
| Resort golf cart and site shuttle (Golf Cart / Shuttle): 6-8 seats, smooth low-noise duty, long standby | 48V / 72V platform | 50 ~ 65 Wh/km | 80 ~ 100 km | 48V 105Ah ~ 150Ah | VT-48105-GC-CANBUS |
Averages at typical full load, 35°C ambient and paved to lightly unpaved surfaces. Where payload or gradient differs from this baseline, recalculate with the dynamic road-resistance coefficient.
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.
Set your operating parameters and the tool derives the nominal pack capacity (Ah), total energy (kWh) and recommended pack specification that satisfies the engineering safety margin.
Calculated values already include the UN38.3 and AIS-156 Phase 2 safe cut-off margin, so they can be used directly as the capacity basis on a container ex-works quotation.
Capacity, service life and lifetime cost are the same dataset viewed at different time scales; reading them together aligns your quotation basis.
A capacity study answers how far the vehicle goes today; a life model answers how far it goes next year, and together they set the swap and depreciation cadence for a fleet.
Read the cycle life whitepaperarrow_forward
Only by folding real consumption, cycle life and maintenance into a cost per kilometre can you judge whether the distribution plan works on the operating side.
Open the TCO modelarrow_forward
Streaming SOC and consumption into a fleet platform lets you reconcile real consumption per vehicle and keep refining the distribution matrix.
Open the protocol centrearrow_forwardTIANQIU powertrain engineers answer the six capacity-loss questions overseas vehicle customers raise most often.
Tell us your kerb weight, motor parameters and target operating country, and the TIANQIU powertrain laboratory will issue a dedicated real-world consumption and capacity study within 24 hours on working days, together with a bench test schedule.
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.
Kerb weight, motor data and operating figures you submit stay strictly confidential. A mutual NDA can be signed first.
