Electric car: power, autonomy, consumption?

[Macro]

10Kw of conso it is 13cv .... It is more than enough to move a big mob .... If you want a small car light and good performance it takes how much ??? 30cv ... Let's say 26 ... We already have 15000 $ from batterrie ...

Topic divided from: https://www.econologie.com/forums/liste-et-p ... 10338.html

[nlc]

With a big sedan 1T4 to 100Km / h I consume about 5L / 100 gasoil on the flat, about engine power 50kW necessary to hold the 100Km / h, or about 17kW for wheeled the big ladle with a motor performance 35%.

So a lightweight electric vehicle 5-600Kg and with good aerodynamics for me should not need more 10kW (13-14ch) to hold the 100Km / h on the flat.

[Christophe]

A) Exact but here we speak in kWh there, not in power.
The citro 106 has 12kWH of embedded capacity. So the order of magnitude of 10 kWh is quite correct! Especially that 10kWh in LiFePO4, it is much less heavy than in Nicd as on its 106!

It gets to 75 km with average.
Consumption: 12 / 75 = 160 Wh / km.

If we assume that it rolls on average at 50km, it consumes:
50 * 160 = 8 kW over one hour, its average power is therefore 8kW.

Citro if you know your average speed, we can refine the calculation.

B) To make a car move at 100 km / h it takes between 20 and 30 hp but the electric car is not made for "cruising" at sustained speed. In urban use for a small car 15kW therefore seems largely sufficient.

C) For the Fluence ZE of renault we have: http://www.renault-ze.com/gamme-voiture ... on-14.html

Engine Power: 70 kW (95ch)
Max speed: 135 km / h
Autonomy NEDC: 160 km

With 95 cv we normally go faster than 135 km / h so there is necessarily a clamping somewhere! Here we find the same problem with the Russian auto e! https://www.econologie.com/forums/e-auto-e-m ... 10355.html


So the power of 95 cv engine is there only for acceleration.

The capacity of the battery is not given on this page (?) But on another: http://www.renault.com/fr/vehicules/ren ... ce-ze.aspx

Engine, battery and charging modes

The electric motor of Fluence ZE is of synchronous type with wound rotor. Its maximum power of 70kW is obtained at the speed of 11.000 rpm and its maximum torque reaches 226 Nm. Its mass is 160 kg. The accelerations generated by this electric power unit are straightforward and linear and the maximum torque is delivered very early.

The lithium-ion battery that equips Fluence ZE has an energy capacity of 22 kWh. On the standard vehicle, the battery is located behind the rear seat backrests so as to maintain a trunk volume of 300 dm3 (VDA / ISO). Its mass is 250 kg. A deceleration energy recovery system recharges the batteries.

With wholesale prices that builders say they arrive at a public price of 0.5 $ / Wh then we have the price of the battery of the Fluence should not be higher than 11 000 $ ... with parity of the day € / $ we are at 8500 € battery for the Fluence.

(The price of a dCi 110 engine is in this order of magnitude as well.)

This one is rented 79 € / month is almost 9 years of "return" ... so it's a good deal for the driver ... (not sure that it will last so long, moreover the offer is limited at 3 years and 30 km!).

But here it is not so good deal because the Fluence is sold 21 300 € without battery, which is very expensive ... AMHA !!

ps: I took the Fluence because it seems to be the best offer of the market among what I could find ...

[Christophe]

With a big sedan 1T4 to 100Km / h I consume about 5L / 100 gasoil on the flat, about engine power 50kW necessary to hold the 100Km / h, or about 17kW for wheeled the big ladle with a motor performance 35%.

So a lightweight electric vehicle 5-600Kg and with good aerodynamics for me should not need more 10kW (13-14ch) to hold the 100Km / h on the flat.

We agree on the figures, see the following message that I wrote at the same time (decidedly ...)

[oiseautempete]

With a big sedan 1T4 to 100Km / h I consume about 5L / 100 gasoil on the flat, about engine power 50kW necessary to hold the 100Km / h, or about 17kW for wheeled the big ladle with a motor performance 35%.

So a lightweight electric vehicle 5-600Kg and with good aerodynamics for me should not need more 10kW (13-14ch) to hold the 100Km / h on the flat.

Ben do not agree!
Uh there we do not understand too ... and FYI it was 36cv (26.5kw) to 11 1935 traction to reach 100km / h (top speed 110km / h with a maximum power of 46cv) and not 50kw ...
And also, the weight has very little influence on the speed on flat: between an empty car or charged, the difference in consumption is very low on flat speed stabilized ... By cons the aerodynamics has a huge influence ...

[Macro]

13cv has the wheel is the power of the 125 80 years was in 120kg in working order ... I see anyway how badly even with a neat aerodynamics by multiplying weight by 5 you will succeed in maintain a machine of this power has 100km / h..C'est also the power of a heavy cart in thermal ca slap in 75 / 80 with a person on board if we put him 110kg of batterrie more ...

But hey, I'm not an engineer ...

[Christophe]

If you agree! Jte promises

50 kW is the thermal power of 5L / 100km = 5L / hour at 100 km / h is 17kW mechanical wheel.

[nlc]

Uh there we do not understand too ... and FYI it was 36cv (26.5kw) to 11 1935 traction to reach 100km / h (top speed 110km / h with a maximum power of 46cv) and not 50kw ...
And also, the weight has very little influence on the speed on flat: between an empty car or charged, the difference in consumption is very low on flat speed stabilized ... By cons the aerodynamics has a huge influence ...

The 50kW I mentioned it was the gas oil consumption, so after it's engine performance in 17kW therefore twenty horses, my numbers are good you just misinterpreted 50kW that was not the power to the wheel but upstream engine;)

[nlc]

13cv has the wheel is the power of the 125 80 years was in 120kg in working order ... I see anyway how badly even with a neat aerodynamics by multiplying weight by 5 you will succeed in maintain a machine of this power has 100km / h..C'est also the power of a heavy cart in thermal ca slap in 75 / 80 with a person on board if we put him 110kg of batterrie more ...

But hey, I'm not an engineer ...

As it was said the weight does not have too much influence at steady speed on the flat, it is more the aerodynamics that plays. And a scoot is nothing aerodynamic, 100Km / h I do not explain the wind and the swirl with the driver!

[Gaston]

This one is rented 79 € / month is almost 9 years of "return" ... so it's a good deal for the driver ... (not sure that it will last so long, moreover the offer is limited at 3 years and 30 km!).

But here it is not so good deal because the Fluence is sold 21 300 € without battery, which is very expensive ... AMHA !!

What matters for Renault is the overall price on 3 years, 21300 + 36 * 79 = 24144 €.
The breakdown between sale price and battery rental had to be "adjusted" so that the figures (purchase and use) were comparable to the equivalent diesel model.