G'day um... EVdragracer, all.
At 05:26 PM 20/07/2013, you wrote:
Pack swapping would be expensive -- you'd need at least 2x the
packs. You also still need some way to charge the packs.
Not necessarily, if it takes a pack of, for arguments sake, 400Ah at
300V to do a days' stage, say 90 cells, if the pack is changed to be
a pair of 200Ah packs the weight in the car is reduced by 585kg, the
total pack cost (2 x 200Ah vs 1 x 400Ah) is similar, the car drives
much better (keeping in mind that this is a road rally with lots of
winding sections).
If you do a dump pack, even if your dump pack is lead acid, that's
still a significant expense and a lot of weight.
Noted.
If the vehicle has regenerative braking, you can do tow regen with a
truck. I have done this, it was fun to get hundreds of charging Amps
( http://explodingdinosaurs.com/9electric/2009saltflats ) . If your
regen is stout enough, this will easily be much more power than any
charger you plug in.
It may be possible to tow during the days' tour sections (the cars
drive out to the race stage then on to the nights' rest area) but may
not be acceptable to the rules. The opportunity to tow enough regen
in a paddock may be a possibility, so something to consider.
Its' quite a challenge to do this race, due to the sheer length of
the days' stages.
Thanks for the input
Regards
James
----- Original Message -----
From: James Massey
Sent: 07/18/13 10:00 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Targa racing
... The race includes refueling stops and tour stages as well as the
race stages, so swapping should be able to be done in a leisurely
manner, rather than a "pitstop" style. The commercial battery swap
systems for forklifts and similar are likely to be too heavy and not
appropriate for mobile set-up (at least the few I've seen). Bruce
suggests dump charging, which may be an option, so we'll see. Bruce
also asks "how much performance?", which I don't know at this stage.
I feel a back-seat area box, if possible to go sideways out, may be
best for weight distribution, constraint and access, but they
already have the roll cage in, and a level of plans that may need to
be worked in with. As I understand it, a standard Tesla did the
"Rookie" Targa event in 2011, which is shortened, I don't even know
if they are planning to do the "Rookie" or main event. At present
they asked me to assist with the EV parts of the build, and I know
very little about the rest of their plans, so I'm ga
thering ideas before I go and meet up with them at the car some
time in the next week or two. ...
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