3 ms·

> fat ass HV cables running to them Do you a more exact specs? Maybe MV 10kV-40kV ? And how thick are these cables? Do they carry 2000A snaking around the

> fat ass HV cables running to them Do you a more exact specs? Maybe MV 10kV-40kV ? And how thick are these cables? Do they carry 2000A snaking around the site?

defrost 3y ago
> Do you a more exact specs? Yes. (It's also a fun bit of internet search challenge best left for the reader) > And how thick are these cables? Thicker than a snake, thinner than a human torso. Imagine the thinnest part of a Toyota Landcruiser after a HaulPak runs over it ... https://www.youtube.com/watch?v=4TskUzmg6Sk https://www.youtube.com/watch?v=4TskUzmg6Sk
95014_refugee 3y ago
There are a number of “standards”, but e.g. Liebherr are using 6kV for their newer small electrified excavation equipment. Cable size obviously varies based on the needs of the equipment, but “not small”, and yes, they are routinely surface-laid around the site. Larger sites do the predictable step-down thing to reduce IR losses. Many of these systems have been around for quite a while, but the move into smaller scale (sub-100t) gear seems to be picking up.
atourgates 3y ago
Hard to get a sense of scale, but you can see them running across the ground in this video: https://youtu.be/Kw-enXeOnKE?t=101 https://youtu.be/Kw-enXeOnKE?t=101
- tivert 3y ago
  >>> Dynamic charging probably means auto hooking a charger at the excavator (which are often electric - they don't move much and can have fat ass HV cables running to them that are dragged when the excavator moves) to boost batteries on the trucks while they park as they're loaded. >>> Optimal performance is no truck idle save when being loaded - dumping is relatively quick. > Hard to get a sense of scale, but you can see them running across the ground in this video: https://youtu.be/Kw-enXeOnKE?t=101 https://youtu.be/Kw-enXeOnKE?t=101 It seems like the loading process is pretty quick too. It's hard for me to see how it would be feasible to hook the truck up to a charger during loading without slowing the process significantly.
  - defrost 3y ago
    Critical path nerds will be looking at lengthening the truck queue. If you slip an extra truck into the rotation then there's a longer idle slot just before moving to the excvator - an opportunity to charge any difference lost on the round trip | regained on the descent to load out. Cost to that is an extra truck - there's a few million. Gains are longer idle time, less heat build on the tires, charging, reduced fuel costs with electric fleet. There are many options to consider and cost. The first draft of things like https://www.micromine.com/pitram/ https://www.micromine.com/pitram/ were written in the early 1980s.

> fat ass HV cables running to them Do you a more exact specs? Maybe MV 10kV-40kV ? And how thick are these cables? Do they carry 2000A snaking around the site?

defrost 3y ago

> Do you a more exact specs? Yes. (It's also a fun bit of internet search challenge best left for the reader) > And how thick are these cables? Thicker than a snake, thinner than a human torso. Imagine the thinnest part of a Toyota Landcruiser after a HaulPak runs over it ... https://www.youtube.com/watch?v=4TskUzmg6Sk https://www.youtube.com/watch?v=4TskUzmg6Sk

95014_refugee 3y ago

There are a number of “standards”, but e.g. Liebherr are using 6kV for their newer small electrified excavation equipment. Cable size obviously varies based on the needs of the equipment, but “not small”, and yes, they are routinely surface-laid around the site. Larger sites do the predictable step-down thing to reduce IR losses. Many of these systems have been around for quite a while, but the move into smaller scale (sub-100t) gear seems to be picking up.

atourgates 3y ago

Hard to get a sense of scale, but you can see them running across the ground in this video: https://youtu.be/Kw-enXeOnKE?t=101 https://youtu.be/Kw-enXeOnKE?t=101

tivert 3y ago
>>> Dynamic charging probably means auto hooking a charger at the excavator (which are often electric - they don't move much and can have fat ass HV cables running to them that are dragged when the excavator moves) to boost batteries on the trucks while they park as they're loaded. >>> Optimal performance is no truck idle save when being loaded - dumping is relatively quick. > Hard to get a sense of scale, but you can see them running across the ground in this video: https://youtu.be/Kw-enXeOnKE?t=101 https://youtu.be/Kw-enXeOnKE?t=101 It seems like the loading process is pretty quick too. It's hard for me to see how it would be feasible to hook the truck up to a charger during loading without slowing the process significantly.
- defrost 3y ago
  Critical path nerds will be looking at lengthening the truck queue. If you slip an extra truck into the rotation then there's a longer idle slot just before moving to the excvator - an opportunity to charge any difference lost on the round trip | regained on the descent to load out. Cost to that is an extra truck - there's a few million. Gains are longer idle time, less heat build on the tires, charging, reduced fuel costs with electric fleet. There are many options to consider and cost. The first draft of things like https://www.micromine.com/pitram/ https://www.micromine.com/pitram/ were written in the early 1980s.