3 Minutes
A Tiny Engine Built to Extend EV Range
Even as automakers push hard into full battery-electric vehicles (BEVs), internal combustion technology is evolving to support them — not replace them. Romanian specialist Horse Powertrain has unveiled the C15, a compact 1.5-liter naturally aspirated four-cylinder designed specifically as an EV range extender. Roughly the size of a small suitcase, the unit integrates a generator, inverter, exhaust and cooling equipment into one compact package capable of recharging an EV battery on the move.
Vehicle Specifications
Dimensions and Packaging
The C15 measures approximately 19.7 in x 21.7 in x 10.8 in, engineered to fit horizontally or vertically in tight engine bays. Its compact footprint makes it suitable for B- and C-segment electric cars, and, in a turbocharged form, for larger D-segment passenger cars and light commercial vehicles.
Power and Emissions
The naturally aspirated version develops up to 94 hp, while a turbocharged variant pushes output to about 161 hp. Horse Powertrain states the design meets Euro 7 emissions limits and can run on liquefied petroleum gas (LPG) where required, improving flexibility for OEMs targeting different markets.
Design and Integration
Designed from the ground up as a range-extending generator, the C15 pairs with existing electric drive units and on-board charging systems. Its all-in-one casing contains the alternator and inverter, minimizing installation complexity. OEMs can mount the module in front or rear compartments with minimal rework, enabling native BEV platforms to be converted into range-extended electric vehicles (REEVs) without major architecture changes.
Performance and Efficiency
Range-extending engines don’t need to be high-revving powerhouses to be effective. The C15 operates at optimized RPM bands to maximize thermal efficiency and minimize fuel consumption while keeping the battery topped up. That steady-state operation helps reduce range anxiety for drivers by extending real-world driving distance without compromising EV driving characteristics.
Market Positioning and Relevance
Automakers are increasingly hedging their bets between pure BEVs and mixed architectures. Industry moves — from Scout’s planned Harvester range-extender option to other manufacturers exploring REEVs — show a trend toward flexible powertrains. Horse Powertrain positions the C15 as a cost-effective, scalable solution for OEMs seeking fast time-to-market for range-extended models where charging infrastructure or customer preferences make extended range attractive.
Comparisons and Use Cases
Compared to large displacement generator engines used in some concept REEVs, the C15 is compact, lightweight and easier to package. Its turbocharged 161 hp variant competes with larger generators intended for heavier vehicles, while the 94 hp naturally aspirated unit targets smaller electric hatchbacks and sedans. For fleet and light commercial operators, the C15’s small size and Euro 7 compliance could reduce complexity and life-cycle costs versus large hybrid drivetrains.
Conclusion
As the transition to electrification continues, range extenders like Horse Powertrain’s C15 offer a pragmatic bridge. They let automakers deliver long-distance capability and faster adoption in regions where charging networks remain nascent. For consumers, that means the benefits of EV driving with fewer compromises on real-world range — all from a briefcase-sized engine designed to integrate seamlessly into existing EV platforms.
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