In reality, the only practical limit to the speed of EV charging is the
size of the charger. Battery design and thermal management of the pack
can keep up with any charger size.
They are about to come out with 300 kW chargers. No joke. Fill you car
up in a couple of minutes.
Here is a paper on fueling time for fuel cells:
https://www.osti.gov/pages/servlets/purl/1389635
What is important to note is that the H2 must be pre-cooled to -40
degrees to keep the vehicle tank temperature below 85 C (which is
considered the maximum safe temperature for H2 in a composite tank.)
This takes even more additional energy to refrigerate the H2 at the
delivery point. This fast fill cooling energy is never accounted for in
any energy efficiency models I've seen.
I also should add that the required "leak check" time that is a
necessary part of the fill process adds quite a bit to the total fueling
cycle time, and is often neglected by advocates of H2 fuel cells.
Bill D.
On 6/28/2019 2:06 AM, Peri Hartman via EV wrote:
The author claims the only real advantage to fuel cells is the fueling
time. And that was two years ago. It's even less of an advantage now
and the trend is continuing.
The only other argument I can see would be the efficiency of the
overall system, including generating hydrogen. The generation part is
the loser. As far as I know, there are only two ways to generate large
amounts of hydrogen: electrolysis or breaking down hydrocarbon
molecules. Electrolysis is about 50% efficient, I think. Hydrocarbon
generally depends on natural gas, and I think we're going to see an
enormous push back on fracking as more health and environmental issues
manifest.
Maybe Toyota got a lot of grant money from Calif. ?
Peri
------ Original Message ------
From: "Bill Dube via EV" <ev@lists.evdl.org>
To: ev@lists.evdl.org
Cc: "Bill Dube" <billd...@killacycle.com>
Sent: 26-Jun-19 6:43:27 PM
Subject: [EVDL] Excellent article (was: Lets discourage hydrogen
advocates. )
Very well researched article on H2 fuel cells versus EV's.
The article expertly covers the "what" but doesn't mention the "why"
of Toyota and H2.
I really would like to know what motivates Toyota to keep pushing H2
passenger cars.
Bill D.
On 6/27/2019 9:57 AM, Lawrence Rhodes via EV wrote:
https://electrek.co/2017/10/26/toyota-elon-musk-fuel-cell-hydrogen/
This was a story saying Toyota thought Elon Musk was right but they
were going to make Fool cells anyway. Lawrence Rhodes
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