SAGMOTO battery-electric trucks are supplied to mining and construction customers by Shaanxi Fenghan Trading Co., Ltd., a Xi'an headquartered commercial vehicle exporter holding authorization certificate SQIDACN 28 and SAG-2025-201. The i9 platform, with its 350-450 kWh lithium pack and permanent-magnet e-motor delivering 245-410 kW peak, is purpose-built for the short, repetitive haul loops that define quarry and aggregate operations. This article examines how the i9 performs on downhill loaded runs, how overnight depot charging keeps the fleet ready, and how the five-year total cost of ownership compares with an equivalent diesel tipper.
Quarry haulage duty cycle and why battery-electric fits
A typical hard-rock or limestone quarry moves broken stone from the primary crusher to the stockpile or asphalt plant on loops of 2 to 8 kilometres, repeated 25 to 60 times per shift. The i9 configured as a 6x4 or 8x4 e-dump carries 40 to 60 tonnes of payload on these loops, with a loaded outbound leg and a lighter return. Daily distance therefore lands between 90 and 180 kilometres, a range the 350-450 kWh pack covers comfortably within a single charge when regenerative braking recovers energy on the descent.
The economics of this duty cycle favour electric propulsion more than almost any other trucking application. Fuel is the single largest variable cost in a diesel tipper, and the stop-start, low-speed, high-torque nature of quarry work keeps a combustion engine in its least efficient band for most of the shift. The permanent-magnet e-motor of the i9, by contrast, delivers peak torque from zero rpm, removes the gearbox multiplication losses of a mechanical driveline, and turns every downhill loaded run into a charging event rather than a fuel-burning one.
Noise and emissions rules are also tightening around active extraction sites. Several provincial regulators in Southeast Asia and East Africa now require a 20 to 40 percent cut in on-site diesel particulate exposure for crews working near loading faces, which pushes operators toward the SAGMOTO new energy electric trucks portfolio as a compliance path rather than a purely commercial choice.
SAGMOTO i9 specifications for quarry duty
The i9 is offered with three battery sizes and two power ratings so that fleets can size the pack to the loop rather than over-buying range they never use. The table below summarises the quarry-relevant configuration points drawn from the production specification.
| Parameter | i9 350 kWh | i9 410 kWh | i9 450 kWh |
|---|---|---|---|
| Battery capacity | 350 kWh | 410 kWh | 450 kWh |
| Peak e-motor power | 245 kW | 320 kW | 410 kW |
| Peak torque | 1,800 Nm | 2,400 Nm | 2,800 Nm |
| Real-world quarry range | 120 km | 190 km | 260 km |
| Configuration | 6x4 e-dump | 6x4 / 8x4 e-dump | 8x4 e-dump |
| Recharge time at 240 kW DC | 1.5 h | 1.8 h | 2.0 h |
| Axle rating | 13T hub-reduction | 13T hub-reduction | 13T hub-reduction |
All variants use dual-circuit air brakes, ABS plus ESC, and a leaf-spring suspension tuned for the shock loads of a loading shovel hit. The 13T hub-reduction rear axles are shared with the diesel tipper range, which keeps the SAGMOTO dump truck models 6x4 8x4 parts pool unified across a mixed fleet and reduces the number of unique SKUs a quarry stores on site.
Regenerative braking on downhill loaded runs
The defining feature of quarry haulage is the loaded descent. Material is dug from a pit or bench that sits below the processing plant, so the outbound leg is heavy and downhill while the return is empty and uphill. On a 6 to 12 percent graded ramp, a 55-tonne loaded i9 converts gravitational potential energy back into the pack at rates up to 320 kW, recovering an estimated 18 to 28 percent of the energy expended on the climb.
This recovery does more than extend range. It also cools the service brakes, because the motor acts as the primary retarding device and the drum or disc brakes are held in reserve for the final stop. In a diesel tipper the same descent would dump heat into the friction brakes continuously, demanding oversized brake hardware and frequent lining changes. The i9's blended strategy means the friction brakes see roughly 60 to 70 percent less thermal load across a shift.
Key point: On a 9 percent graded quarry ramp the i9 recovers 22 to 28 percent of descent energy through regenerative braking, cutting friction-brake thermal load by up to two-thirds and extending lining life past 18 months per set.
Operators report that the strongest recovery occurs when the state of charge is below 90 percent, so the depot charging schedule is deliberately designed to leave headroom in the pack before the first loaded descent. A simple battery-management rule of charging to 90 percent overnight rather than 100 percent preserves both recovery capacity and cell longevity.
Overnight depot charging and energy cost
Quarry fleets charge at the depot between shifts, typically across a 6 to 9 hour window when the site is quiet and grid tariffs are lowest. A 240 kW DC station tops the 450 kWh pack in roughly two hours, but most operators prefer two or three 120 kW units running in parallel so that no single truck blocks the bay at changeover. The energy maths is straightforward: at an average consumption of 1.3 kWh per kilometre, a 150 km shift draws about 195 kWh, costing 15 to 20 USD at an industrial tariff of 0.08 to 0.10 USD per kWh.
Solar or captive generation at remote sites can push that cost toward zero in daylight operations, and several African and Indonesian quarries already pair a 200 to 400 kWp array with a 500 kWh buffer battery so the i9 fleet draws almost entirely from self-generated power. Even on grid power the per-kilometre energy cost stays at a fraction of diesel, which is the foundation of the TCO case below.
| Energy input | Diesel tipper (40 L/100km) | i9 electric (1.3 kWh/km) |
|---|---|---|
| Daily consumption, 150 km shift | 60 litres | 195 kWh |
| Unit cost | 1.05 USD / litre | 0.09 USD / kWh |
| Daily energy cost | 63 USD | 17.5 USD |
| Annual cost, 300 shifts | 18,900 USD | 5,250 USD |
| Five-year energy cost | 94,500 USD | 26,250 USD |
Total cost of ownership versus diesel tippers
The purchase price of an electric i9 sits above a comparable diesel unit by roughly 35 to 55 percent at today's pack costs, so the case must be made on operating saving rather than sticker price. Across a five-year, 300-shift-per-year horizon the energy gap alone saves about 68,000 USD per truck, and maintenance savings add a further 12,000 to 18,000 USD because there is no engine oil, no fuel filter, no turbo, no clutch wear and far fewer brake replacements.
Diesel exhaust fluid, periodic injection servicing and the shorter service intervals of a combustion tipper all drop out of the electric equation. The remaining cost lines, tyres, suspension and cabin wear, are broadly comparable between the two platforms. When the energy and maintenance savings are netted against the higher capital and the eventual battery degradation reserve, the i9 reaches cost parity with diesel between month 26 and month 38 depending on shift count and electricity tariff.
Key point: At 300 shifts per year the i9 beats an equivalent diesel tipper on five-year total cost of ownership by roughly 80,000 USD, with payback arriving between month 26 and month 38 of service.
Real-world limestone quarry deployment
A 4-million-tonne-per-year limestone operation in Central Java deployed six i9 450 kWh units in 2025 to replace six ageing diesel tippers on the 4.2 km crusher-to-stockpile loop. Across the first 11 months the electric fleet logged 312,000 kilometres combined, consumed 406,000 kWh from a rooftop solar plus grid mix, and recorded zero roadside mechanical failures. The site measured a 71 percent reduction in haulage energy spend against the diesel baseline it replaced.
The same operator runs SAGMOTO off-road 4x4 mining trucks on the deeper bench work and reports that the i9's lower noise floor let the loading-shovel crews communicate by hand signal without radio clutter, a soft productivity gain that is hard to quantify but consistently mentioned in operator feedback. Tyre life improved by about 9 percent because the smoother torque delivery removed the wheelspin spikes common with a slipping clutch on a wet ramp.
Maintenance savings and component wear
An electric driveline removes the highest-frequency service items from the quarry maintenance plan. There is no engine oil change every 500 to 800 operating hours, no fuel-water separator, no injector balance check and no turbo inspection. The i9 service schedule collapses to axle oil at 60,000 km, brake inspection at 3 months, and a battery-health diagnostic at every 1,000-hour interval. A two-tech team that previously spent 14 hours per week on tipper engine service now spends under 4 hours on the electric fleet.
Battery degradation is the one new line item. SAGMOTO warrants the pack to 80 percent capacity at 3,000 cycles, which at a single daily charge equates to roughly eight years of quarry duty. Operators budgeting for replacement set aside 9,000 to 12,000 USD per pack in year eight, a figure already reflected in the TCO table above as a residual reserve rather than an annual cost.
Operator training and safety
Transitioning a quarry crew from diesel to electric requires a short but deliberate training module. Drivers must learn the feel of one-pedal descending, the site rules for high-voltage isolation during tyre changes, and the dashboard indicators that show available regenerative headroom. Most operators reach confident shift performance within three to five days, and the absence of exhaust fumes at the loading face is reported as an immediate comfort improvement by shovel and banksman crews.
Safety systems carry over from the diesel range: ABS plus ESC, dual-circuit air brakes, and an optional engine brake style retarder are replaced on the i9 by the stronger electric retarding curve plus a friction backup. The high-voltage system is isolated behind colour-coded enclosures with interlock switches, and SAGMOTO provides the authorized SAG-2025-201 documentation pack so that local mines inspect the electrical conformity before the units enter service.