Electric excavator powertrain efficiency gains 53% more runtime with Danfoss Dextreme Max

Fifty-three percent more runtime. Same battery. No compromise on productivity

(Image courtesy of Danfoss)

Danfoss Scotland has validated its Dextreme Max digital hydraulic system in a 30-tonne battery-electric excavator, cutting power consumption by 35% and extending battery range by 53% on a single charge. The results, funded by a £4.29 million grant from the UK Government, mark a significant step toward the fleet electrification of large construction and mining excavators where runtime and total cost of ownership have long constrained adoption.

Dextreme Max powertrain efficiency: how the system works

The Dextreme Max system centres on the DDP180D, a Digital Displacement pump/motor that replaces the conventional swashplate hydraulic pump. Ten independently controllable outlets supply the excavator’s four primary functions: boom, arm, bucket, and swing. A ganging block dynamically reallocates hydraulic capacity between services, eliminating flow-sharing losses that drain energy in standard systems.

Danfoss engineers developed a dedicated hydraulic H-bridge valve for the boom circuit. This enables independent metering, anti-cavitation, pressure amplification, and energy recovery during overrunning motions such as boom lowering, a function that wastes significant energy in conventional machines. A real-time control architecture manages the hydraulic system, electric powertrain, and auxiliary subsystems together.

The test platform was a Develon DX300LC-7 crawler excavator converted to electric drive by Staad B.V. The electric drivetrain includes a Danfoss Editron EM-PMI375 permanent magnet synchronous motor, EC-C1200 inverter, MC050 motor controller, and three 140-kWh battery packs.

Battery range results support fleet electrification case

Testing followed JCMAS air grading and JCMAS air dig and dump protocols. Against the baseline electric machine, Dextreme Max reduced battery energy use by 49.2% in air grading and 31% in dig-and-dump cycles, with negligible impact on cycle time. Applying a representative duty cycle of 30% grading and 70% digging, the blended energy saving reaches 35%.

That figure translates directly into fleet economics. The same battery capacity delivers 53% more operating hours, or operators can achieve comparable runtime using two battery packs instead of three, reducing upfront capital cost and easing battery management system demands. Both outcomes lower the total cost of ownership barrier that has slowed heavy-duty fleet electrification.

Alasdair Robertson, Senior Director of Digital Displacement at Danfoss Power Solutions, said the results confirmed the potential of digital hydraulic architectures to address the main obstacles in heavy-duty machinery electrification, and committed to further optimisation work.

Commercialisation path and next steps for electric excavator powertrain efficiency

Danfoss structures its Dextreme offering in three tiers. Dextreme Swap, a direct pump replacement, and Dextreme Flex, which introduces flexible outlet allocation, are both commercially available. This project advances the commercialisation path for Dextreme Max, the highest-efficiency configuration. The company confirmed further development work continues, with the goal of reaching the system’s stated target of up to 50% energy consumption reduction.

The project received £4.29 million from the Red Diesel Replacement Phase 2 Competition, part of the UK Department for Energy Security and Net Zero’s £1 billion Net Zero Innovation Portfolio. The grant covered approximately 65% of eligible project costs. The programme targets low-carbon alternatives to red diesel across the construction, mining, and quarrying sectors.

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