Electric car efficiencies

[NeilBlanchard]

There are Prii batteries with over 300K miles on them. The Leaf battery is warrantied for 100K miles, and it will probably last a lot longer than that.

The YASA 750 motor has peak efficiency of 94%, and the Remy is also 94% peak efficiency .

Electric motors do not need warm up.

Electric motors don't idle.

You can get regenerative energy back into the battery, instead of heating the brakes.

Electric motors don't need oil changes.

Electricity can come from several different renewable sources, which will be available for the next billion years or so.

[Ladogaboy]

Neil,

I don't mean to pick on you, but without a long, drawn out answer citing theoretical/futuristic alternatives:

Do you actually believe that there are enough renewable energy sources to meet even half of today's global energy usage, let alone all of it?

[Ecky]

Originally Posted by Ladogaboy

Neil,

I don't mean to pick on you, but without a long, drawn out answer citing theoretical/futuristic alternatives:

Do you actually believe that there are enough renewable energy sources to meet even half of today's global energy usage, let alone all of it?

I believe so, but we obviously don't have a fraction of the infrastructure to take advantage of it.

We'll continue to burn fossil fuels until they become more expensive than the setup-costs of renewable sources.

[Ryland]

Originally Posted by Ladogaboy

Do you actually believe that there are enough renewable energy sources to meet even half of today's global energy usage, let alone all of it?

Yes, but even if we just use the electrical generation infrastructure that we already have we'll be ok from a generation stand point because of the energy it takes to refine, pump and dispense gasoline.
Add to that a smart grid and improve our over all energy efficiency and you will see the current trend continue, the current trend being that construction of renewable energy power plants outpaced non renewable energy power plant construction.

[TheEnemy]

Originally Posted by Old Mechanic

Va Tech calculated my in wheel drive produced 380 pounds feet of torque at 0 RPM.

Per wheel at 99% efficiency at 0 RPM. Your motor can't touch that or regenerate any significant amount of energy.

regards
Mech

380ftlbs at 0 RPM = 0% efficiency, and without proper current limiting capabilities you are going to burn up your motor/controller/batteries/wiring.

My T-case is already dealing with over 700ftlbs on the input shaft and once I put the new transmission in it with a 6+:0 first gear it will have over 1300ftlbs at the input. There are others putting 2-3000ftlbs through the same gearbox without problems.

Edit to add: There are quite a few off roaders that are interested in the idea of an electric conversion because of the low RPM torque they put out.

[Frank Lee]

380ftlbs at 0 RPM = 0% efficiency, and without proper current limiting capabilities you are going to burn up your motor/controller/batteries/wiring.

Only problem with that is, Old Mech's drive is hydraulic.

[TheEnemy]

As far as renewable sources a mix of solar, wind, and biofuels (from sewage and other waste) while still a ways off from full implementation would be able to supply most of our power needs, but I have serious doubts that we would be able to supply all of our energy needs.

[TheEnemy]

Originally Posted by Frank Lee

Only problem with that is, Old Mech's drive is hydraulic.

How is he getting 99% efficiency on a hydraulic system?

[mort]

Originally Posted by Ladogaboy

Neil,

I don't mean to pick on you, but without a long, drawn out answer citing theoretical/futuristic alternatives:

Do you actually believe that there are enough renewable energy sources to meet even half of today's global energy usage, let alone all of it?

Maybe. Total power used by people on earth is about 13 TW. Solar power available on accessible land areas: 580 TW.
-mort

[user removed]

How is Neil claiming 94% efficiency when you loose 15% before you move one revolution of the wheels.

You just totally contradicted that information. In fact at 0 wheel speed in a direct drive electric car the efficiency is closer to 50%.

Look at dcb's graph in another thread. Try actually reading and comprehending the information others spend time and energy to provide you, to educate yousefl, so you will be informed.

Obviosuly you did not even bother to read my post.

regards
Mech