| > Modern vehicle weigh multiple tons, what's a half-ton battery really matter? The Tesla Model S weights about 2100kg. The Tesla Model S battery weights about 540kg. This means that a 1500kg car is forced to pack an additional 540kg to be able to store energy. That's an additional 30% of the mass that you need to accelerate and brake. People do care about that. In the very least, the battery mass is responsible for an effective drop in energy efficiency of around 30% just to cart someone around. > Finally, electric cars charge at ~96% efficiency, while hydrogen is something like 40%. I, for one, am not interested in paying 3x per mile. This claim has little substance and credibility. For starters, if you factor in how much additional energy you need to waste just to pack along a massive half ton battery, you'll eventually realize that the effective energy waste of a EV is not much different than the hydrogen one. I mean, the point of a EV is not to have it parked on the driveway, charge a battery, and proceed to boast about how that was very efficient. Your goal is to move around, and moving that massive half ton beast of a battery along with you wastes a lot of energy too. Also, battery efficiency is around 80%, which naively sounds a far improvement over fuel cell's lauded 40% efficiency. However, a Li-Ion battery weights half a ton and represents around 1/3 of a EV's mass, which also requires energy to be moved around. For reference the fuel cell of a Toyota Mirai is only 40kg, less than the weight of an adult passenger. Once you do your math you'll quickly notice the effective energy use is not that different. And then there's the cost argument. The typical back-of-the-napkin figure for how much EVs cost to run is around 500€/year. Even if you bump that up to twice the cost, that price is eclipsed by the huge markup that you're already paying for an EV. I mean, a Tesla Model S costs about a century worth of energy bills before it even gets it's tires dirty. Playing the frugality card with the current batch of EVs lacks any credibility and is, at best, being penny wise and pound foolish. |
I think this is the wrong angle to look at the issue.
A 2100kg EV requires 25% of its total mass to support the energy storage, generation and transfer in order to provide a range and performance profile people are generally happy with.
What is the fraction for a new ICE vehicle with similar profile? The combustion engine weighs... how much? Then add the weight of a 60% full fuel tank to allow for roughly the average deadweight haul between refills. Then include the weight of the exhaust system.
And finally, we have to include the weight of the drivetrain. How much of the total weight in an ICE is dedicated to power transfer from engine to wheels? How much in a modern EV?
Energy storage and generation is only a part of the picture, getting it to the wheels is what makes a car actually perform its function. We should include these numbers to get a meaningful comparison.