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  • #15388

    sandy
    Participant

    Pretty sure a HID (as well as technically being illegal) will invalidate your warranty as your going to be running extra feeds off the 12v battery.

    #15379

    In reply to: Energy Saved: 0kwh?


    Big277wave
    Participant

    The kinetic energy equation is e=mvsquared/2 where e= energy in joules, m= mass in kg and v= velocity in metres per second. So for a mass of 1kg and a velocity of 1 m/s the kinetic energy is 0.5 Joules. Double the speed to 2 m/s and the kinetic energy becomes 2 Joules, which is four times as much.

    The figures I am reading are from the consumed energy screen not the eco driving one. It looks like the ecodriving screen rounds the numbers and doesn’t add up the small amounts of regen. After your next journey take a look at the consumed energy screen under menu / vehicle / electric vehicle which gives consumption, heating and regen figures to 1 decimal place.

    Wind resistance is the main source of energy dissipation at speed but for a short duration acceleration and deceleration test I would have thought that the conversion of battery power to kinetic energy of accelerating 1700 Kg will dwarf wind resistance (provided you limit your speed). Try resetting the energy consumption before you accellerate on a motorway slip road and see that the Miles per Kwh is very low and will take quite a while to recover to your usual average. Similarly as you brake your m/kwh goes up as the kinetic energy is regenerated to the battery. If anyone can come up with a simple cheap measurement the regen efficiency it let me know.

    #15373

    In reply to: Buying ZOE for export.


    MITSCH
    Participant

    5000€ more to own the battery. that’s 4-5 years of paying the rent for it
    i would go for the rent, but if you’re buying for export, it’s easier to own


    Dexter1979
    Participant

    When you do a long road trip (100 miles+) or a lot of motorway driving at full speed the battery will get warm. The car will try and drop the temperature using the 2 fans it has. I have had the car on a 22kW point after a long trip and the rear fan as @alloam said would be humming away. On a rapid the main cooler kicks in to try and cool the charger. If needed both fans will be running.

    Entirely normal and another little thing that Zoe has over the Leaf: Active air cooling of the battery pack.

    #15355

    daymolton
    Participant

    I have found that If you start charging with more than aprox. 40% on the battery, the car will not charge at full speed. You need to have less than 30-40% on the battery to get the full 43kw out of the charger.

    #15352

    In reply to: Buying ZOE for export.


    MITSCH
    Participant

    hi invis

    check this site http://www.finn.no
    click Bil and choose zoe. plenty of them, battery included
    report back how it goes

    #15345

    In reply to: Energy Saved: 0kwh?


    ??D
    Participant

    I’m not convinced with the 30% efficiency figure that I have seen quoted. I’ve never seen a figure attributed to actual measurements or even theoretical calculations.

    I don’t know how accurate this is either (I’ve quoted it, because someone else said it), but I suspect there’s also confusion about how efficient the recovery process is, and how much of the exerted energy you’re getting back. These are very different figures…

    Tesla say that the recovery process is about as efficient as delivery (I’m assuming ZOE isn’t all that different):

    http://www.teslamotors.com/en_GB/blog/magic-tesla-roadster-regenerative-braking

    They quote around 80% in both directions, meaning a 64% return. However, you need to also subtract all the other losses, eg.:

    1. 100% of energy taken from the battery is not delivered to the motor (there’s all the rest of the electronics in the car to run)
    2. Delivery of energy from wheels to ground is not 100% efficient (rolling resistance)
    3. Air resistance is not 0, especially at higher speeds

    I’m sure there are other things too. If Tesla’s 80% is correct, then the max recovery is 64% assuming those things above are 0 (and none of them are). I could easily see this coming out at around 30% (maybe a little more at low speeds, and much less at much higher speeds).

    #15339

    In reply to: Energy Saved: 0kwh?


    Big277wave
    Participant

    I’m not trying to get the regen figure high, it’s just a typical figure that I have seen. I generally try to use cruise control on the flat to maintain a speed. Down steeper hills I knock it off to minimise regen. The amount of regenerated energy that you get back on braking from 58 to a few mph on a sliproad is quite high.

    I’m not convinced with the 30% efficiency figure that I have seen quoted. I’ve never seen a figure attributed to actual measurements or even theoretical calculations. I intend to try and get a measurement by repeatedly accellerating and braking a few times when on a clear road to see if I can get a figure (no constant speed between). I wouldn’t want to do it too much as it’s probably not good for the whole energy chain (battery, mtor driver and motor). It will give a rough measurement, it would not be easy to take out the variables like accelleration rates and rolling resistance losses. To make a proper measurement you would need a lot of kit and a heavily instrumented car.


    alloam
    Participant

    This is entirely normal. There are two different fan noises you may get while charging (which is, as you would expect, relative to the rate of charge (how much power is being pumped through the circuitry into the battery pack) and the temperature. There is a low hum from the rear of the car which are the fans for the battery pack sited under the rear seat. The loud fan noise you hear when rapid charging is the main cooling circuit for the motor and inverter which is deployed mostly when rapid charging, though you will get it periodically when charging at 22kW too.


    Smidge69
    Participant

    I had this huge fan noise charging with the granny cable last night after a long fast run (3.0 mpkwh including a rapid charge in middle). It ran like this for 10 mins then I turned it off charge and then on again and it stopped. Was loud enough to disturb neighbours and was probably using as much power for the fan as the granny was putting into it! I guess charging when battery is hot is damaging.

Viewing 10 results - 1,581 through 1,590 (of 2,711 total)

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