Midori_Schaaf t1_j7rbnb7 wrote
TL;DR The new battery claims potential for 1KWh per kilogram.
Context: gas is about 12 or 13 kwh/kg
Li-ion batteries are about 0.25kwh/kg
allenout t1_j7s78j6 wrote
Bear in mind, electric motors can be 95+% efficient while ICE cars are at best 25% efficient, so that means that ICEs are actually more like 2kWh/kg while metal air batteries are 1kWh/kg+, so a electric car would only need about 2x the size of full fuel tank as a ICE car.
SandAndAlum t1_j7t3xcw wrote
You also need to include regen. And the fact the tank has a weight.
1kWh/kg is roughly on par with a small reciprocating ICE.
allenout t1_j7t4ims wrote
The fuel tank is made from thin plastic so the weight is largely irrelevant.
SandAndAlum t1_j7t5ie3 wrote
They're still >20kg when plastic, and the last few I saw were steel and weighed as much as the fuel.
ctudor t1_j7wed8j wrote
i think ICE engine and specific parts add more weight than their electric counterparts.
solotryps t1_j7y84cg wrote
An ICE transmission also wastes a lot more power than a simple EV reduction gear
mrSunshine-_ t1_j7t4kxk wrote
Petrol density is something like 0,72, so it drops even more. In 50 kg petrol space you get 75kg battery.
GI_X_JACK t1_j7t6xrt wrote
Also keep in mind that ICE doesn't translate %100 to Electric use wise.
The infrastructure of gas is you basicly fill it up once a week, at a gas station.
Unless you live out on a farm, you can't have a refueling station in your house. You can't also run a gas pipe, as gas stations need trucks to show up and refill the gas. There is a lot of logistics into fuel processing and delivery that is specific for ICE.
Electric? You just have a high amp 240V circuit installed and charger. for a GOOD charger its about $1k, and another $1k USD to have the line installed. All the infra is already there.
You don't need a week of fuel, only a day.
Also, as noted below, EVs are far more efficient.
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