Hanoi's metro construction program runs around the clock, and concrete delivery to station sites must meet strict night-pour noise limits that diesel mixers routinely breach. The electric truck solves this directly: a battery mixer is near silent at the pump and produces no exhaust in a dense urban trench. The KT9X electric mixer truck, built on the TZ8J electric mixer platform, is our unit for 8 m3 metro-grade pours where noise compliance is non-negotiable.
Metro station work needs continuous concrete supply, often with night pours to avoid daytime traffic and to keep pour continuity. A diesel mixer in this class burns about 0.45 to 0.55 L/km under load plus significant idle while the drum turns, costing $0.40 to $0.72 per kilometer at Vietnamese diesel prices of $0.90 to $1.30 per liter. The KT9X draws about 1.1 to 1.6 kWh/km when loaded, and at Vietnamese commercial electricity of $0.08 to $0.20 per kWh that drops to $0.09 to $0.32 per kilometer, with the drum driven electrically at idle at almost no energy cost.
The KT9X carries a 350 kWh CATL LFP pack with an 8-year or 4,500-cycle warranty, and FOB pricing runs from $100,000 to $135,000 with the 8 m3 drum. On a typical Hanoi loop of 20 to 60 km the pack covers multiple round trips per charge and tops up at the batching plant between pours.
Urban night-pour rules in Hanoi cap site noise, and a diesel mixer's engine plus drum drive is a frequent complaint source that can halt a pour and delay the whole station sequence. The KT9X's electric drivetrain and electrically driven drum cut site noise to a fraction, letting contractors pour through the permitted window without community complaints. The zero exhaust also improves air quality in the deep, enclosed station boxes where workers are present.
Most metro concrete comes from a fixed batching plant, so charging is simple: install a 360 kW DC charger at the plant and the KT9X leaves each morning full, topping up during load windows. A 360 kW unit moves the pack from 10 to 80 percent in 45 to 90 minutes, which fits the natural gap between pours. Battery swap is available in 5 to 6 minutes for contractors running back-to-back night pours with no charging slack.
The drum's electric drive also removes the diesel engine that would otherwise idle through the entire pour, cutting both fuel and the heat load in confined station boxes. Over a multi-year metro program the 35 to 40 percent maintenance saving and lower energy cost compound across hundreds of pours.
| Cost element | Diesel mixer truck | KT9X EV truck |
|---|---|---|
| Energy per km | $0.40 - $0.72 | $0.09 - $0.32 |
| Idle drum energy | burns fuel | near zero |
| Maintenance per km | $0.20 - $0.28 | $0.12 - $0.17 |
| FOB price | $80,000 - $115,000 | $100,000 - $135,000 |
| 8-year energy and service | $560,000 - $780,000 | $250,000 - $380,000 |
The table shows the KT9X's saving is driven by idle-free drum energy and lower maintenance, with noise-compliance value on top. Over an 8-year program the electric mixer typically saves $250,000 to $400,000 per unit versus diesel, and the payback usually arrives inside three years on a busy metro contract.
Vietnam's infrastructure push, from Hanoi metro to expressway builds, needs mixer trucks that meet tightening urban noise and emission rules. The KT9X, built on the TZ8J electric mixer truck platform, meets both while lowering cost, and it qualifies for growing low-emission construction incentives.
For planners comparing national options, our Vietnam electric truck market page tracks construction incentives and charging grants for the KT9X and the wider electric mixer range.
The 350 kWh CATL LFP pack on the KT9X carries the standard 8-year or 4,500-cycle warranty, which covers the full commercial life of a mixer truck on a multi-year metro program. Dongfeng's LvKong motor shares service intervals with the wider EV range, so a single training program qualifies your mechanics across drum and chassis. We ship a spare-parts kit with each order, including contactor, compressor, and regen brake components, sized for a 12 to 18 month runway at the batching plant.
Driver training is quick because the single-speed drivetrain removes gear shifting in Hanoi traffic; most diesel mixer drivers are confident within a day. We provide a plant charging plan that sequences trucks through the 360 kW charger during load gaps so pour continuity never waits on energy. For fleets scaling from two to fifteen units, the identical pack and motor keep inventory and training cost flat as the contract grows.
Safety and community benefits matter on dense metro sites. The zero-tailpipe KT9X removes diesel exhaust from enclosed station boxes where workers are present, and the near-silent electric drivetrain plus electrically driven drum cut noise to a fraction, letting contractors pour through the permitted night window without complaints. Combined with the idle-free drum energy, the truck lowers both cost and the footprint of your Hanoi operations.
Range planning for the metro loop is simple. The KT9X's liquid-cooled pack holds capacity through Hanoi's heat and humidity, and the 8-year warranty protects against thermal wear. Operators report that the steady electric torque on bridge approaches improves schedule reliability versus a diesel unit, a small but cumulative gain across the hundreds of pours in a metro program.
For contractors bidding night-pour work, the KT9X is the practical choice because noise compliance is often the deciding factor. Spec the 8 m3 drum with pump hookup, install the plant charger, and the truck meets both the emission and the noise rules while costing less per cubic meter than the diesel mixer it replaces.
For Vietnamese contractors moving first, the KT9X de-risks the switch because night-pour noise compliance is often the deciding bid factor. Spec the 8 m3 drum, install the plant charger, and the truck typically pays back inside three years while meeting both emission and noise rules on the Hanoi metro program.
We export the KT9X as a complete FOB unit with 8 m3 drum, pump hookup, and left-hand drive for Vietnam. Lead time from confirmed order to FOB loading is 45 to 70 days. We supply the charger specification and a TCO model built on your diesel baseline and local tariff so you can validate the saving before ordering.
Request a written FOB quote with your target drum size, pump setup, and charging method. We return a line-item price and a suggested plant charging layout for your Hanoi or regional site.
Every Dongfeng electric truck we ship is covered by an 8-year or 4,500-cycle battery warranty on the CATL LFP pack, plus 3 years on the LvKong motor and controller. Shaanxi Fenghan Trading keeps a rotating stock of high-wear parts — brake pads, filters, suspension bushings and charging connectors — in Xi'an for 72-hour dispatch by air freight. Buyers receive an English service manual, wiring diagrams and video-based technician training for their local workshop team, and our engineers answer diagnostic questions on WhatsApp within one working day. For fleet orders of five units or more we include a free on-site commissioning visit to set up chargers and train drivers.
Ready to electrify your fleet? Contact Shaanxi Fenghan Trading — authorized Dongfeng EV truck exporter. WhatsApp: +86 153 1943 1311 | Email: sales@fenghan-trade.com | dongfengevtrucks.com
🌐 Our Network: Fenghan Trade (SAGMOTO/SHACMAN Truck Export) · heavy duty mining dump truck 6x4 8x4