RC-Monster Forums - View Single Post - What kind of performance would the Tesla have

Lauri · 07:41 PM

lutach, check the energy density for the Panasonic cells Tesla is using and about which you posted the spec-sheet pdf. They are 202Wh/kg - which is VERY GOOD, if the specs can be trusted!

For comparison on my 1/8 buggy I'm using 5Ah 4S softcase LiPos (35C and 40C) which weigh around 530g which makes only 140Wh/kg. Sure those can give out A LOT power but when speaking about Tesla you are speaking about a regular car, not a racer or a dragster. So my 1/8 buggy battery pack is +45% lighter than the Panasonic cells. If I would not be racing 10-minute heats but 60 or 120-minute heats I'd be running those Panasonic cells just like Tesla :)

If I would be building an electric car (just give me the money ;) I'd also be getting the batteries which have the best energy density and can provide enough power/curren.

You've all talked about heavy batteries and then you want those heavy batteries just for the fact that they'd be able to deliver more power. Obviously the lighter cells can provide _enough_ power while being 45% lighter for an example.

If you run 10-minute then you need avarege of 6C current from the batteries (60min/10min=6). If you'd like to drive around 3 hours with your electric 1/1 car then you'd only need 60min/180min=0.3C batteries. With a fullsize car you are not going to accelerate and brake every 3 seconds like you are doing with small scale RC-cars. You maybe accelerate for 4 seconds to reach 100kmh and then drive until next red light.

In real life you only need 0.3C capable batteries that can provide the maximum power for 5 or 10 seconds. What's the time it takes for Tesla to reach its maximum speed? It won't be more than 10 sec I'm guessing.

For passanger car I'd like to have a battery, that:
- has good lifetime and many lifecycles
- can give out enough power to accelerate the car up to 100kmh in decent time ie 5s for sports car, 10s for regular car
- has best available energy density so you don't have to accelarate and brake the extra mass all the time
- has ok cold performance.Won't like to spend too much power to keep the battery very warm.

	(#45)
Lauri RC-Monster Carbon Fiber Offline Posts: 61 Join Date: Oct 2009 Location: Estonia, Europe	01.23.2010, 07:35 PM lutach, check the energy density for the Panasonic cells Tesla is using and about which you posted the spec-sheet pdf. They are 202Wh/kg - which is VERY GOOD, if the specs can be trusted! For comparison on my 1/8 buggy I'm using 5Ah 4S softcase LiPos (35C and 40C) which weigh around 530g which makes only 140Wh/kg. Sure those can give out A LOT power but when speaking about Tesla you are speaking about a regular car, not a racer or a dragster. So my 1/8 buggy battery pack is +45% lighter than the Panasonic cells. If I would not be racing 10-minute heats but 60 or 120-minute heats I'd be running those Panasonic cells just like Tesla :) If I would be building an electric car (just give me the money ;) I'd also be getting the batteries which have the best energy density and can provide enough power/curren. You've all talked about heavy batteries and then you want those heavy batteries just for the fact that they'd be able to deliver more power. Obviously the lighter cells can provide _enough_ power while being 45% lighter for an example. If you run 10-minute then you need avarege of 6C current from the batteries (60min/10min=6). If you'd like to drive around 3 hours with your electric 1/1 car then you'd only need 60min/180min=0.3C batteries. With a fullsize car you are not going to accelerate and brake every 3 seconds like you are doing with small scale RC-cars. You maybe accelerate for 4 seconds to reach 100kmh and then drive until next red light. In real life you only need 0.3C capable batteries that can provide the maximum power for 5 or 10 seconds. What's the time it takes for Tesla to reach its maximum speed? It won't be more than 10 sec I'm guessing. For passanger car I'd like to have a battery, that: - has good lifetime and many lifecycles - can give out enough power to accelerate the car up to 100kmh in decent time ie 5s for sports car, 10s for regular car - has best available energy density so you don't have to accelarate and brake the extra mass all the time - has ok cold performance.Won't like to spend too much power to keep the battery very warm. Last edited by Lauri; 01.23.2010 at 07:41 PM.