Electric compact asphalt rollers from Hamm

Hamm is introducing a range of eight compact tandem rollers featuring electric drives. The firm’s new HD CompactLine models will all be offered with the option of electric power instead of the conventional diesel engines.

September 5, 2022

Hamm is introducing a series of electric asphalt compactors

There are 24 models in the conventional CompactLine at present, with weights ranging from 1.6tonnes up to 4.8tonnes as well as drum widths from 800-1,380mm and an array of specifications and features. Hamm has offered emissions-free electric variants of the most popular units however.

The new electric models feature Li-ion batteries with 23kWh capacity, allowing operation for a full working day without the need to recharge. Included in the electric range is a model featuring both oscillation and vibration, the first such model available on the market. This last unit will be of particular benefit for working in urban areas as it is quiet in operation while the oscillation system means it does not transmit vibration to the surrounding area.

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Compact electric rollers coming to market

The twin drum CC900 e and CC1000 e models are said to deliver the same power and performance of their diesel counterparts. Both rollers benefit from the advantages of electric drives, with savings on running costs, fewer moving parts, and low maintenance needs. They also have powerful batteries capable of completing a full day of operation without recharging. The CC900 e and CC1000 e deliver the same static linear load, amplitude, gradeability, and travel speed as the diesel-powered models on which they are based, with no compromise on productivity or job site performance.

In a typical working day, a 1.6tonne roller will be used for repairs and compaction of around 70 – 80tonnes of asphalt/day at a layer thickness of 40–50mm. In terms of area, this is roughly about 700 m2. Based on experience, this guarantees that the battery will last for a full day of work. In 90% of the cases in trials, about 20-30% of the battery level was left after the workday was over.

With the fast charger, 400V/three-phase system it takes 1.3 hours to reach 80% charging level. The 230V/single-phase charger needs 6 hours to reach 80% of capacity. Dynapac is planning to provide adapters allowing the use of automotive charging stations.

Both rollers in this segment are primarily used in road repair work and are intermittently used. With conventional diesel motors, this means that they are often left idling while the asphalt is raked into position. After compaction, the machines travel to the next repair site where they are also left idling for extended periods. With a standard diesel-powered machine, a great deal of energy and money is wasted. An electric roller does not idle when not in use. In addition, both models are quieter than conventional units, which is of extra benefit for use in urban areas.