[ExI] gas prices

[Angel Z. Lopez]

Tesla has the capability to put in a second alternator that recharges
batteries continuously

On Tue, Mar 29, 2022 at 9:42 PM spike jones via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

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> > *On Behalf Of *Henry Rivera via extropy-chat
> *Subject:* Re: [ExI] gas prices
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> Your ideas in this area, Spike, remind me of this image which was
> circulating around Facebook:
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> Hi Henry, OK that is obviously not going to charge the battery.
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> >…Pic below of a fossil fuel-powered generator. 110v plugs at maybe 12
> amps take forever to charge my Tesla battery relatively speaking: around 3
> miles gained for every hour of charging vs about 220 mi/hr at a
> Supercharger. A 220v diesel generator at 30 amps would give me about 18
> mi/hr I think.
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> -Henry
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> When I ran the numbers on this, I was getting similar results.  If someone
> drove around town with one of these running full blast, the battery would
> still discharge but at a slightly lower rate perhaps.  If one ran on the
> freeway with this rig running, the difference in discharge rate would
> scarcely be noticeable.  It would run down nearly as quickly with or
> without the generator back there.
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> People don’t really need to rig up something like this.  Get someone who
> knows how to do the calculations beforehand, make sure you know what you
> will get if you go to the effort to build it.
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> There was a former colleague who was a car hobbyist back in the 90s.  He
> built an all-electric using a bunch of lead acid golf cart deep cycle
> batteries.  He started with an old quarter ton pickup with a used-up
> engine, replaced it with an electric motor which he interfaced to a
> standard transmission (itself quite a trick (but he did it.))  He had a 5
> MW generator back there which he would run during the day in the parking
> lot.
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> In those days, the number of employees had dropped dramatically, so he
> parked it way out in the back corner of the lot where the racket wouldn’t
> bother anyone.  He drove it down from Santa Cruz with the generator off,
> started the generator when he got to work, ten hours later, drove it home
> with the generator off.  It was experimental.  His findings: starting with
> a full charge in the morning, he wouldn’t use up all that much charge
> coming down here the 50 miles (it is a lot of downhill) but the generator
> couldn’t recharge the batteries enough to get back to a full charge.  He
> estimated it did about a quarter of a charge in about 9 hours.
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> With that, he had enough charge to climb back up to Santa Cruz and plug
> in.  The batteries would then have about 12 to 13 hours with his high
> current charger which would charge it back up (mostly.)  He commented it
> wasn’t as good a performer as he had hoped.  The rig was way overweight
> (well imagine that) and the overall fuel economy was no better than, well
> worse than, the gasoline motor it replaced.  Take away: lead acid batteries
> are not practical for that application, which is why we never saw a
> successful series hybrid before lithium batteries became affordable.  Note
> that the nickel hydride was also too heavy for a series hybrid.  From what
> I am calculating, even lithium batteries are not likely to give us a
> successful series hybrid car.
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> All is not lost.  The parallel hybrids are good cars, better in my opinion
> than the all-electrics in cost/performance ratio.  I am going against the
> grain and making the claim that the notion of coal to liquid fuel driven by
> solar power is practical, if… we get a suitable (big) piece of ground near
> the equator, very dry air, useless as hell for anything else, with access
> to the sea.  I can find only one place like that on the planet: West Sahara.
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> spike
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