CRANE BATTERIES Ӏ POWER GENERATION
metals on the cathode tweak
and improve Li-ion capacity.) “The cranes’ performance in ‘unplugged’ operation allows for erecting the boom and jib, for travelling a distance of approximately 650 metres with full counterweight or for approximately eight hours of crane operation. All models have the same performance as the conventional versions,” says Liebherr marketing manager Griesser Gregor. But those big, heavy batteries do not actually always have to be carried on the crane. “External
battery packs for cable power supply as an alternative to mains power are also conceivable for use on small mobile cranes,” says Federle. “It may be possible to meet the demand for ‘local zero emissions’ on larger cranes using buffer battery storage devices.” As indeed is already happening for tower cranes. The average construction site uses tower cranes, and here is where some of greatest savings in CO2 emissions could be made. Buildings and the construction industry account for 39% of global carbon emissions.
Tadano reveals evolt rT
At this year’s CONEXPO in Las Vegas Tadano showcased the prototype for the GR-1000XLL EVOLT, the world’s fi rst battery electric rough terrain crane, which Tadano announced would be launched in 2024, fi rst in the USA and in Canada with additional markets to follow. The GR-1000XLL EVOLT can travel to work sites and take care of all lifting operations there exclusively with energy supplied by its batteries, making fully zero-emission operation possible. A single battery charge is enough for up to nine hours of on-site crane operation, or fi ve hours of crane operation with a travel distance of up to 12.5 miles (20 km). Battery capacity is therefore enough to cover an entire typical workday for this crane model. Integrated regenerative braking lengthens both the running time and the range.
SHORT CHARGING TIME Tadano says its engineers are proud of the short charging time that they have achieved: it takes just two hours using fast charging on a US-COMBO CCS1 connection, and about seven hours with normal charging on a three-phase 240 VAC, 100 A commercial supply. Unlimited operation with the crane plugged into a power outlet is available as well. The crane’s lifting performance is exactly the same as that of its
diesel-driven counterpart, the GR-1000XLL-4. The electric motor delivers 194 kW, giving a top speed of 11.2 mph (18 km/h). Its dimensions are exactly the same as those of the GR-1000XLL-4. “This crane will make an invaluable contribution to achieving our
goal of reducing the CO2 emissions from our products by 35 percent by 2030,” says Toshiaki Ujiie, President and CEO of Tadano. Tadano calculate that the electric-powered GR-1000XLL EVOLT
will deliver annual savings of around 2,200 gallons of diesel, resulting in a reduction of more than 24 US-tons of CO2 emissions for an average crane usage scenario. Tadano has also announced the 25 tonne class GR-250N EVOLT
rough terrain crane, which is scheduled for launch in Japan later this year. It is an electric sibling of the conventionally-powered GR-250N. The electrifi cation of the machine was based on tech demos with which Tadano developed and tested solutions for a market-ready,
fully electric crane that would be suitable for real-life use. This powerful and extremely fast 194-kW machine is the fi rst commercial crane to come out of that process. Again, the battery can sustain a mix of work and travel: up to 11
hours of operation at the worksite or, for example, 25 miles (40 km) of travel followed by fi ve hours of operation; again work is possible in plugged-in mode.
28% is from the materials – concrete is a huge emitter of CO2; but the construction of those buildings – the cranes, excavators, earthmovers and the like – emit the remaining 11%. Here is the low-hanging fruit ripe for electrification. To power a tower crane by
electricity there are two main options: mains current, via cable; or battery power. Both have disadvantages. Let us look first at batteries. Batteries do not make power. They store it. They have power fed into them at one time
CRANES TODAY 27
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