Caterpillar’s battery-electric power unit makes its debut in Doppstadt’s spiral shaft separator

Caterpillar has unveiled its Battery Electric Power Unit (BEPU) for the first time publicly, integrated into a Doppstadt SWS 6 Spiral Shaft Separator at IFAT Munich. This prototype represents the culmination of about a year’s collaboration between Caterpillar, its dealer Zeppelin Power Systems, and Doppstadt. The SWS 6 machine, which processes materials such as scrap wood, yard waste, construction debris, and refuse-derived fuel, now features a fully electric powertrain designed to replace the traditional diesel engine without altering the machine’s core architecture. The BEPU is a compact, all-in-one unit that fits into the exact footprint of a diesel engine, using the same mounting points and positioning within the machine. This design allows original equipment manufacturers (OEMs) to offer electrified variants of existing models without the need to develop entirely new platforms. By enabling a seamless swap between diesel and electric powertrains, Caterpillar aims to overcome a significant barrier in off-highway equipment electrification, which typically requires separate engineering and support systems for each power source. Andy Curtis, customer solutions director at Caterpillar Industrial Power Systems Division, highlighted the advantages of the BEPU in accelerating the development of electric options alongside diesel variants with minimal engineering changes. He noted that the intermittent duty cycle of the SWS 6, combined with its use in indoor and urban environments where emissions and noise are regulated, makes the electric power unit particularly suitable. Additionally, the BEPU’s onboard battery system simplifies energy management by buffering power from low-voltage grid sources, enhancing operational efficiency for end users. The introduction of Caterpillar’s BEPU in the Doppstadt separator signals a broader shift towards electrification in off-highway machinery, especially for applications where environmental regulations and operational context favour electric power. This development could pave the way for more widespread adoption of electric powertrains in sectors traditionally dominated by diesel, reducing emissions and noise pollution without compromising existing machine designs. Future steps will likely focus on refining the technology and expanding its application across Caterpillar’s range of equipment.