[aprssig] Tesla Field Day mode (or any EV/Hybrid) at work

[Patrick]

Don't forget the purely "selfish" secondary rewards of the solar carport
like them having absorbed all the sun's heat and protected from weather
that would have hit the car.  It's much faster / more efficient to cool a
car on a hot summer day that's been parked under a charging shelter, and to
get into one that's under a cover when it is raining.

p

On Thu, Feb 28, 2019 at 2:50 PM Rick Green <rtg at aapsc.com> wrote:

> On Thu, 28 Feb 2019, Jason KG4WSV wrote:
>
> >
> >
> > On Thu, Feb 28, 2019 at 8:47 AM Robert Bruninga <bruninga at usna.edu>
> wrote:
> >
> >        If just one of those spots is covered with 12 solar panels, that
> is enough to provide free transportation 40 miles a day) forever.
> >
> > If a solar footprint that size could actually provide a useful amount of
> power to the vehicle, why the heck would you put it on the GROUND and not
> on the VEHICLE???
> >
>    'That Size' is approximately 96 square feet, or 6 feet by 16 feet,
> approximately the entire footprint of a passenger car. How many vehicles
> could
> you sell with the boxy shape it would take to have 96 square feet of
> essentially
> flat roof?
>    Installing solar cells directly on a vehicle would also be wastefully
> inefficient, as they would not be optimally oriented to the sun, and once
> the
> onboard batteries were fully charged, any energy captured could not be
> utilized
> unless the car were connected to an external load.  These inefficiencies
> would
> have the effect of increasing the 'payback time' for the system, and
> considering
> the cost of funds and the short lifespan of the typical passenger car,
> payback
> may be never.
>    Solar panels installed as a 'carport shelter' over existing parking
> lots is
> already being implemented.   Fixed installations may be grid-tied or have
> other
> fixed 'dump loads' to utilize the excess power generated, and will
> certainly
> outlive the vehicles they are charging on day one.
>    The local Chevy dealer installed just such an array over their car lot
> when
> the Volt was introduced. I'm assuming that was mostly considered an
> advertising
> promotional expense, but in my travels, I've observed similar
> installations on a
> larger scale at Michigan State University, and also along I-10 in Tucson,
> AZ.
> If the technology is economically viable in those disparate places, it's
> probably viable everywhere.
>    Providing Grid power for charging at worksites during the peak demand
> afternoons would further exacerbate that problem.  Providing Grid-tied
> Solar at
> daytime worksites would benefit the employees, the employer's business,
> and the
> community at large.
>
> ...and as for Field Day itself, is there an inverter on the market today
> which
> will accept the high voltage DC input of today's hybrids and EVs, and will
> also
> self-start without a grid-tie clock source?  In the ~10Kw range?  With US
> standard 240VAC Split-phase output?  That's my estimate of what it would
> take to
> run a 5 transmitter club FD operation comfortably...  The Tesla's battery
> pack
> is about 75 KwH, right? Or about 3 Kw average load for a 24 hour FD
> operation,
> so I'm guessing a 10Kw inverter would handle the peaks.
>
> --
> Rick Green N8BJX
>
> We, the People of the United States of America, reject the U.S. Supreme
> Court's
>   Citizens United ruling, and move to amend our Constitution to firmly
> establish
>   that money is not speech, and that human beings, not corporations, are
> persons
>                         entitled to constitutional rights.
>
>                         http://www.MoveToAmend.org
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