3 ms·
> Telsa gets 5 km per kWh, and takes an eternity to charge, Renault Twizy gets almost 10 km per kWh, and charges at 12 km per minute with aftermarket fast charg
by Yaggo 5y ago
> Telsa gets 5 km per kWh, and takes an eternity to charge, Renault Twizy gets almost 10 km per kWh, and charges at 12 km per minute with aftermarket fast charger.
This is very misleading. Twizy is a two-person mini car. It gets good range for its battery size when driven slowly (like 45 km/h) but at speeds comparable to regular cars it loses its advantage. It's lightweight but not very aerodynamic. The "high-end" version of Twizy is limited to 80 km/h and won't give much range at that speed.
Also, it takes 3 hours to charge its 6 kWh battery, i.e. the charging power is roughly 2 kW, i.e. charging power to capacity ratio is only 2/6 = 0.3C, not very much. Liquid-cooled full size cars such as Tesla can be quick charged even at peak of 3C (!), i.e. 50 kWh battery can take 170 kW for a short time and 1C for long time. That's MUCH quicker charging than Twizy.
Sure, home-charging the Model 3 SR+ takes 5 hours even with maximum 11 kW power, but it's mainly intented for overnight use, and then again gives you massive range of 600 km or so when driven Twizy's speeds (if not more).
I agree that generally smaller cars gets better range more easily, i.e. aerodynamic body shape such as Model 3 can get the same range with 50 kWh battery than much bigger SUV shaped car with 80 kWh battery. If both cars have the same quick charging power (in kilowatts), the smaller cars gives you much better charging speed in km/h, due to its lower consumption, thus travels long distances faster.
- baybal2 5y ago> That's MUCH quicker charging than Twizy I wrote that it involves aftermarket charger. But the principle remains the same with a bit heavier cars. A smaller battery, on a smaller, lighter vehicle which gets a lot of kms per kwh can potentially be spending less, or equal time charging than bigger cars per km of travel in daily use. And they will have the advantage of not killing its battery with 3C charging while still proving adequate kms/per minute charging. Hyundai Ioniq is a good example. That's why I see mainstream EV economy class to spring around 15-30 kwh battery sizes, simple uncooled/air cooled LFP battery packs, along with moderately fast charging, and aim at high real world km/kwh digits.
- Yaggo 5y agoI think we both agree with the principle of smaller batteries being very usable for many EV. Twizy is just a bit apples vs oranges. Ioniq, especially with the smaller/older 28 kWh battery is very impressive, considering its age and cost. Low consumption & quick charging (despite being air-cooled!). Still, if you want to travel long distances as quickly as possible, bigger battery combined with a sleek car such as Model 3 gives you an advantage because you can hop from charger to charger using the lower end of your battery capacity with extremely fast charging speeds. Smaller battery needs to be charged to higher SOC to make it to next charger, which is typically slower (so called "taper").