We replace the diesel engine and driveline on trucks and buses with electric powertrain. You keep the same chassis, cab and electrify for cheaper
Economics
How Tresa Retrofit™ saves money
Reduce per km operating cost vs diesel ICE vehicle
Reduce upfront capex vs new electric vehicles
Case Study: Current Engagement
Per Truck 10-year TCO Savings
₹2.02 Cr
Fleet Details
- Model
- MAN CLA 25.300
- Fleet Size
- 100 Trucks
- Age of Fleet
- 13 Years
Operational Metrics
- Range
- 100-120 km
- Charging
- DC-Fast 10-80% (60-90 minutes)
- GVW
- 45T (overloaded)
Key Assumptions
- Daily run rate
- 150 km
- Interest rate
- 15% EV, 11% ICE
- Calculation scope
- 10 years
- Mileage (ICE)
- 1.25 kmpl
- Mileage (EV)
- 0.5 km/kWh
- Electricity tariff
- INR 15/unit
- Diesel
- INR 100/L
10-Year Total Cost of Ownership (per truck)
| Per km | Diesel (ICE) | Tresa Retrofit |
|---|---|---|
| Capital cost / km | ₹8.04 | ₹14.81 |
| Interest / km | ₹2.82 | ₹4.43 |
| Fuel / km | ₹80.00 | ₹30.00 |
| Maintenance / km | ₹24.61 | ₹25.14 |
| TCO / km | ₹117.27 | ₹74.39 |
We build solutions best suited to your requirements
Choose how you want to build your electric fleet
You have trucks
We convert the trucks you already own
You need trucks
We find a used truck, convert it and deliver it ready to run.
Why retrofit beats purchasing a new e-truck
40% cheaper than a new electric truck
You already own paid-off chassis, cab and axles. You only pay for the new drivetrain and battery.
Break even as fast as 14 months
On higher utilisation routes, a retrofitted vehicle pays back for itself under 36 months compared to a new ICE vehicle
Your truck is already paid off. Now it can earn again
Old trucks are usually fully depreciated. A retrofit puts that asset back to work instead of sending it to scrap.
A battery sized for your route and operations
We size the pack to your daily km and load, so you don't pay more for range you'll never use
Frequently Asked Questions
Most conversions take a few weeks once the vehicle reaches our workshop. We assess the truck, remove the diesel engine and driveline, install and calibrate the electric powertrain and battery, then test it before handing it back.
About Retrofit
What changes on your truck, and what stays the same
Tresa's retrofitment process
You have trucks
- Step 1: Operations Review and Assessment
- Step 2: ICE Drivetrain Removal
- Step 3: Install e-powertrain
- Step 4: Integrate & calibrate
- Step 5: Test & Certify
- Step 6: Deploy & fine tune
You need trucks
- Step 1: Operations Review and Assessment
- Step 2: Procure & refurbish EOL trucks
- Step 3: ICE Drivetrain Removal
- Step 4: Install e-powertrain
- Step 5: Integrate & calibrate
- Step 6: Test & Certify
- Step 7: Deploy & fine tune
Retrofitment Options
Central Drive System
- Keeps your rear axle: the motor drives your truck's existing propeller shaft, rear axle and differential.
- Built for tandem axles: one motor drives both rear axles which suits 6x4 and 8x4 trucks.
- Strong low-speed pull: a multi-speed gearbox handles heavy loads, tipper work and steep site roads.
E-Axle Drive System
- Fewer parts to service: the motor, gearbox and differential sit in one unit on the rear axle, with no propeller shaft.
- More km per charge: power goes straight to the wheels instead of travelling down a long driveline.
- More room for batteries: removing the gearbox and propeller shaft frees up space along the chassis.
Tresa Retrofit Solutions
Retrofitment for 25T (Overloading till 45T GVW)
Battery Pack: 250-300 kWh
Drivetrain: Central Drive System
Operational Metrics
- Range
- 100-150 km
- Charging
- DC-Fast 10-80% (60-90 minutes)
- GVW
- Upto 45,000 kg
What is Removed
- — Diesel engine
- — Fuel system
- — Exhaust & Cooling System
What is Added
- — Drivetrain
- — Battery packs
- — Fast-charging system
- — Control electronics
Retrofitment for 12T - 18T
Battery Pack: 150-300 kWh
Drivetrain: Central Drive System or E-axle Drive System
Operational Metrics
- Range
- 100-350 km
- Charging
- DC-Fast 10-80% (60-90 minutes)
- GVW
- Upto 25,000 kg
What is Removed
- — Diesel engine
- — Fuel system
- — Exhaust & Cooling System
What is Added
- — Drivetrain
- — Battery packs
- — Fast-charging system
- — Control electronics
Retrofitment for 7m chassis - 12m chassis bus
Battery Pack: 100-300 kWh
Drivetrain: Central Drive System or E-axle Drive System
Operational Metrics
- Range
- 100-350 km
- Charging
- DC-Fast 10-80% (60-90 minutes)
- Bus class
- 7m, 9m, 12m
What is Removed
- — Diesel engine
- — Fuel system
- — Exhaust & Cooling System
What is Added
- — Drivetrain
- — Battery packs
- — Fast-charging system
- — Control electronics
A Case Study
How Tresa Retrofit™ can save you ₹1.21 Cr per truck over 10 years
Tresa is working with one of India's largest EPC players helping them cut the running costs of their heavy duty tippers
150 km
Daily run rate (315 days / year)
₹67.95
Total cost per km, new diesel truck
₹42.15
Total cost per km, Tresa Retrofit™
10 Years
Vehicle holding period
= 10-year savings per truck
₹1.21 Cr
25T truck · 200 km range · rated load (1×) · pays back in month 10. Fuel, energy, truck or retrofit price, loan interest, maintenance and staff included.
Check projected savings for your operations
Tresa Retrofit™ Savings Calculator
Pick your truck, its load and the range you need, then set your daily run. We compare 10 years of retrofitting your truck against buying a new diesel one.
10-year saving per truck
₹1.21 Cr
Break-even: Month 10 (≈ 10 mo)
- Retrofit price
- ₹51.00 L
- Tentative pricing. Excludes homologation and development fees.
- Battery size
- 192 kWh
- New diesel truck
- ₹38.00 L
Cost per km over 10 years
| Per km | New diesel | Retrofit |
|---|---|---|
| Truck / retrofit cost | ₹8.04 | ₹10.79 |
| Loan interest | ₹2.82 | ₹3.23 |
| Fuel / energy | ₹41.67 | ₹14.4 |
| Maintenance + staff | ₹15.42 | ₹13.72 |
| Total cost / km | ₹67.95 | ₹42.15 |
Compared with buying a new diesel truck of the same class, over 10 years. 315 operating days a year, diesel ₹100/L, electricity ₹15/kWh.
