"Big rigs will have to slash fuel consumption by 23 percent".

[redpoint5]

Originally Posted by Isaac Zachary

Sizing also is important. Close to full load is where most engines are the most efficient. But how do you size an engine to run within a small window of load and RPM? This is where a hybrid could help. If it has enough energy to help the truck accelerate or climb any sort of grade and then efficiently absorb as much as possible whenever possible (including excess from the engine on small descending inclines), then the engine could be sized much closer to an ideal size for average power needs.

That's primarily where I think hybrid comes in. With electric assist, the engine can be downsized so that it's sized appropriately for steady cruise (plus a little extra to recharge the battery). It also allows the drivers to shut down the engines when they rest instead of idling all night.

[freebeard]

I can't find the thread on on-highway charging so I'll drop this here:

https://www.youtube.com/watch?v=a-z86kYtqO8

Megawatt charging rates? 400 miles range in one half hour. The idea to put the charging pad at a loading dock seems to make sense. Loading and unloading would be a larger proportion of the day. for short routes.

[Hersbird]

Originally Posted by California98Civic

I don't think that is correct, oil pan. It would seem newer trucks have exceeded the initial mandate announced in 2011:

“From 2012 to 2017, we saw a lot better fuel economy year over year,” said Mike Roeth, executive director of the North American Council for Freight Efficiency. Overall, new trucks get are a third more fuel efficient than older ones, he said.
https://www.trucks.com/2019/07/15/fu...t-truck-sales/

That line is a little misleading. He's not saying a 2012 truck vs a 2019 truck gives you a 33% improvement. He's say the average truck on the road in 2012 was getting 33% less economy than a new one in 2019. The average truck on the road in 2012 might have been a 1995 for all we know because he's playing word games. I'm sure it's better comparing a 2019 to a 2012 truck but not 33% better.

[redpoint5]

Originally Posted by freebeard

I can't find the thread on on-highway charging so
Megawatt charging rates? 400 miles range in one half hour. The idea to put the charging pad at a loading dock seems to make sense. Loading and unloading would be a larger proportion of the day. for short routes.

That's one of the few applications I can see inductive charging making sense, especially if they can get losses pretty low...

Still don't know why that's much better than a cable though. Pretty easy to plug one in. If heat becomes a problem in high amperage charging in a cable, just imagine how big of a problem it is with induction charging.

[oil pan 4]

Wind and solar power don't lend them selves well to on demand megawatt loads that pop up at inconvenient times.

[freebeard]

OTOH Software Defined Power does. Who just announced a utility-as-a-service product? I forget.

[aerohead]

Originally Posted by redpoint5

That's one of the few applications I can see inductive charging making sense, especially if they can get losses pretty low...

Still don't know why that's much better than a cable though. Pretty easy to plug one in. If heat becomes a problem in high amperage charging in a cable, just imagine how big of a problem it is with induction charging.

GM reported a 99% efficiency for it's EV1 inductive charge port of 1996.
Seems like they've pretty much 'nailed it.'

[aerohead]

Originally Posted by oil pan 4

Wind and solar power don't lend them selves well to on demand megawatt loads that pop up at inconvenient times.

That was the challenge that led to the 'grid-scale' battery R & D. Which appears to be a work-in-progress-solution for planned loss of carbon 'spinning reserves.'

[oil pan 4]

It still is a problem. Batteries don't create electricity and you can't store what isn't generated.

[aerohead]

Originally Posted by oil pan 4

It still is a problem. Batteries don't create electricity and you can't store what isn't generated.

Hence the infrastructure bill. Record low interest rates. Durable, long-term return on investment, ability of a sovereign to sell financial products to itself @ zero-interest, and forgive itself any debt if need be.
If one was to incur debt for a good reason it's the perfect time to do it.
Then brick and mortar will fly!