Nasta
ZE690 Grid-Battery – The Innovative 70-Ton Giant Electric Excavator
Sometimes it’s the size that counts.
The machine, a 70-ton excavator, is based on a Hitachi ZX690LCH-7 and adapted to Nasta’s Peakshaver+ concept. The machine is electrified by Nasta Spesialproduksjon in Larvik.
What we delivered?
Hevtec Control System features used in this project:
- Intelligent power and energy management
- Multiple energy source management
- Cabin, battery system and power electronics thermal management
- Data logging and edge computing
- Auxiliary system control
- Charge contro
- Touch-screen GUI for the swappable battery system
Drivetrain
Battery electric, grid-hybrid
Energy storage
297 kWh
Electric power
375 kW
Motor solution
ABB M3LP 315KHC 4
Inverter solution
ABB HES880
Charging solution
ABB HES880
Charge power (AC/DC)
300
Charge time 0-80% (AC/DC)
~45 min
Weight
kg
Contractor Chooses 1000V Electric Excavator with 300kWh Battery and PeakShaver+
After good discussions about the technical solution and construction time, the contractor concluded that a 70-ton excavator, converted to electric operation at Nasta, would be the desired solution.
“Technical solution with 1000v on the machine, in addition to a 300kwh battery on board, provides sufficient flexibility. The machine has the capacity for some rigging and moving without a cable, and the battery also functions as a buffer against the power grid (Peakshaver+). Cable container included, with 180m cable with remote control and auto-retraction”, explains Ytreland.
Energy source
Battery and grid hybrid
Battery capacity
300 kWh
Grid supply
1000, 690 or 400Vac connection
Motor power
348 kW
Machine weight
71,400 kg
Facts about PeakShaver+
The PeakShaver+ system is built on a combination of battery and power supply. The machine can run on battery for approx. One hour at full operation. This makes it possible to belt the machine between different power points or move and load the machine when transport to the next project is needed.
When it is connected to power, it also uses the battery, but then to relieve power peaks. From the cable, 60% to 100% of what the machine needs at full operation is then taken from the cable, while the rest is taken from the battery.
Big Christmas Present Delivered on Time
The first machine of its kind went to Vassbakk & Stol in December 2024. Chief Engineer Jostein Ytreland at Vassbakk & Stol was on hand to receive the big “Christmas present”:
“The machine will go on the Rogfast project, on an intermediate stockpile of stone at Arsvågen. Here it will handle loading rock masses onto barges for onward sea transport. Up until now, loading has been done electrically on barges with front-end excavators, but due to the range and capacity, handling of intermediate stockpile will require a back-end excavator solution of this size.”
Proof That Collaboration Drives Real Impact
With a 4.4 cubic bucket, the machine really towers over the terrain. Key Account for corporate customers at Nasta, Nils Arve Norendal, is satisfied with the final product:
“This is the first 70-tonner of its kind in Europe, and we are very proud of that.”
Colleague and machine salesman in Rogaland, Bjarne Bøe, nods in the affirmative:
“This has been a different and great job, both within the Nasta organization, but not least towards customers. Everything that is new is of course exciting and challenging. A long and good relationship with Vassbakk & Stol, and not least their understanding that a project like this can be demanding, has meant that together we have found good solutions. Vassbakk & Stol have clear opinions about what they want, and have contributed throughout the entire process. Simply fantastic teamwork!”, concludes Bøe.
Jan Ivar Ibsen, Head of the Special Production Department at Nasta, has extensive experience with emission-free machines. Nevertheless, this is the largest electric machine delivered by the machine supplier to date. Ibsen was of course on site, together with a group of skilled mechanics from Nasta and Haugsland (Nasta’s service partner in Rogaland).
Despite the fact that the final touches were carried out in mildly challenging weather, the machine was commissioned with good feedback from the customer:
“Experience with Nasta as a machine supplier, and Nasta special production on previous deliveries, gave confidence that they could deliver the machine as described. Dialogue and follow-up along the way have been good and the quality of the work is very well done.”
