What is important to keep in mind is that BYD is is now offering a
Corrola-sized EV for about $15k.
https://electrek.co/2024/02/19/byd-launches-15k-qin-plus-ev-kicking-off-price-war-gas-cars/
It is impossible to build your own EV for even double this price, even
getting all the labor for free.
It would likely be less expensive to buy a brand new $15k BYD and move
all the components into your motorless BMW. Seriously.
In "days of yor" there were no OEM EVs to be bought, so we built them
ourselves. This is no longer the case.
Bill D.
On 4/26/2024 4:14 AM, (-Phil-) via EV wrote:
In this age I declare DC dead. It would be hard to go wrong if you can
cram a Tesla Model 3 rear drive unit in there, they are some of the most
reliable and efficient units made. Unless you do something special (such
as SepEx) you don't get regen with DC. This takes a large efficiency hit,
especially in local city driving.
We do OEM-level conversions of the Ram Promaster to all-electric using the
Tesla Model 3 Drive unit. They have been proven to be almost bomb-proof
even lugging very heavy vans around.
But that said, a Conversion is non-trivial. We did 2 years of engineering
to bring our vans to market. It's a long project even for someone with
deep mechanical and electrical experience. It can be very rewarding, but
it's not something I'd suggest unless you have a lot of time (such as being
retired) and the skills. (Either that or be willing to pay $50k+
minimum) Some high-quality one-off conversions done by skilled
professionals routinely end up in the $200k range.
One common "old school" method was to bolt a DC motor to an old ICE
transmission with an adapter plate. These drivelines are highly lossy,
just the right-angle conversion at the hypoid pinion drive in the rear-end
can suck down over a kilowatt of loss! There's a reason why you see the
lifted truck guys put big aluminum-finned covers on them. Then there's
the transmission... Plus you get no regen. Yeah it's mechanically
easier, but you end up with a short range low-performance conversion.
On Thu, Apr 25, 2024 at 3:52 AM bill devos via EV <ev@lists.evdl.org> wrote:
Thank you, Lee. I will definitely look up these publications. I believe I
did look at one of these last year and have to admit I was a bit blown over
by the depth of the discussion for instance, how does one decide whether to
go AC or DC?
Bill devos. Rochester, New York.
Sent from my iPhone
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