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Joined 1 year ago
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Cake day: October 25th, 2023

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  • To get up a hill you have to input the energy based on m*g*h. Note how time isn’t part of this equation.

    The losses that you can affect by speed are wind and rolling resistance. Both of which go up as your speed increases. So slower is better.

    …to a point as there are consumers in your car that are independent of driving. E.g. your AC/heater, lights, and simply keeping the cars computer running also draws some power. So there is an equilibrium point where crawling even slower will no longer save energy.






  • EVs are very efficient. This means they don’t have all this waste heat sloshing around as in an ICE.

    On the down side this means an EV has to get some energy from teh battery to supply heating (but compared to the amount of energy you use for driving the energy for AC/Heating is tiny)

    On the up side this means you get heat/cold instantly and don’t have to wait for a motor to heat up. It also means you can precool/preheat your car from the app and you neve have to fiddle around with AC/heater controls while driving.








  • ADAC statistic (2023) for how often cars need roadside assistance (in german, but you can probably make out what the various graphics/tables mean or run it through google translate)

    https://www.adac.de/rund-ums-fahrzeug/unfall-schaden-panne/adac-pannenstatistik/

    Key numbers:

    Cars with need for roadside assistance (per 1000):

    ICE: 6.9 total (of which: 2.5 due to 12V battery; 1.6 tires; 0.5 starter/lights/ignition; 0.6 keys/locks: 1.3 motor/motor management/high voltage system…and then various positions at 0.1 each for chassis, drive related systems, brakes and ‘other’)

    EV: 4.9 total (of which: 2.5 due to 12V battery; 1.1 tires; 0.6 starter/lights/ignition; 0.2 keys/locks: 0.2 motor/motor management/high voltage system…and then various positions at 0.1 for chassis, other drive systems, brakes and 0 for ‘other’)

    (I highlighted the block “motor/motor management/High voltage system” whicc is probably what you’re intersted in. Effectively ICEs break down 6-7 times as often due to issues in that area)





  • The problem here is: you don’t always have solar (e.g. in winter) and for most people the car isn’t at home while the sun is out because they have a job/commute.

    Read: To make DC charging work at home reliably you need a pretty big battery storage system…and you have conversion losses twice: Once going from solar panels (or the grid) into the home storage battery and from there to the car.

    It’s just not worth it.