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

Mon Feb 25 12:10:13 EST 2019

V2G charging and grid management:

I think this Vehicle-to-Grid (V2G) concept will never take off, simply
because it cannot work unless the cars are plugged-in all day.  This WILL
work if workplaces do employee charging the right way, that is, with rows
and rows of parking spaces with simple 120v outlets.  During an 8 hour
work day, the average EV can gain up to 30 miles of daily range to
replenish their incoming commute while costing about 50 cents a day.

But since so few "employers" have any EV experience, they opt for very
expensive $5000 Level 2 chargers instead of a $15 outlet from Home Depot.
As a result, these big expensive chargers have to be shared throughout the
day, require expensive internet and credit card connectivity and
management and each person that plugs in only for an hour or so has to
move their car every hour or so and does not want any of his electricity
to go back to the grid, he wants the charge!

But with every car plugged into a 120v outlet (the right way), the
employer can use that fixed daily load to balance his dynamic load and
thereby actually reduce his peak-demand charges.  And the financial
benefit of demand-response loading can likely exceed the 50 cents a day to
charge an EV and so most likely allow the employer to provide the charging
for FREE.

It's a win-win.  Every EV gets a pretty good commuter charge per day for
low cost or free, the employer saves electric bill money by managing peak
demand, and the grid wins by reducing dynamic demand..  And all of this is
accomplished without ever having to use V2G and all its inherent social
negativity.

Its an exciting new world of energy.  If people will just wake up to the
potential...

Bob, WB4APR

-----Original Message-----
From: aprssig <aprssig-bounces at lists.tapr.org> On Behalf Of Andre
Sent: Monday, February 25, 2019 10:47 AM
To: aprssig at lists.tapr.org
Subject: Re: [aprssig] Tesla Field Day mode (or any EV/Hybrid)

I am currently working for a electric grid company in the Netherlands, the
current charging protocol of electric cars support both smart charging
(only charge when there is a surplus of energy) and back charging
(supplying energy back to the grid when there is high demand) off course
this requires a charger that can support this, most home chargers can not
but the newest public chargers (non fast charge) are capable if enabled.

So it is not the car that is limiting this but rather the charger you use,
as the charging protocol is public it might be possible to make your own,
not sure I would recommend it as we are talking several 100 volt DC.

73 Andre PE1RDW.

On 2/20/19 8:36 PM, Robert Bruninga wrote:
> The idea in the Tesla or any other Hybrid or EV is to just draw 60 Hz
> inverter power from the 12 volt battery system.  As long as the car is
> "on", it will maintain the 12v system with up to 100 amps of current.
> This is enough to provide about a kW *average* to the House or Field Day
for hours.
> Peak loads are only limited by the size of your $100 inverter.
>
> Though the national average is about 1 kW per hour per house, under
> emergency conditions, I figure I only need about 250W for every light
> in the house (now LEDs) and only about 250W while the refrigerator is
> running and that is only half the time.
>
> So, I guess that is what I was thinking.
>
> Bob
> -----Original Message-----
> From: Greg D <ko6th.greg at gmail.com>
> Sent: Wednesday, February 20, 2019 2:23 PM
> To: Robert Bruninga <bruninga at usna.edu>
> Cc: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> Subject: Re: [aprssig] Tesla Field Day mode
>
> Hi Bob,
>
> Yes, but the hard part is getting at that power.  The trick you used
> with your Prius (aka PriUPS) is harder to do in modern EVs, given how
> the new batteries have a much higher voltage and are well isolated.
> You can't just pull up the floor panel in the trunk and hook in with a
> pair of alligator clips.
>
> Just putting a ham radio in my EV was a challenge, since one can't
> pull much power from the "accessory" outlet.  Mine is only rated to 8
> amps, and most mobile rigs can pull up to 13 amps.  In some cars,
> going direct to the relatively small 12v battery isn't much better
> unless the car is on or actively charging.  And if it's charging,
> well, you don't exactly need the car...  I ended up going with a Yaesu
> FT-817, which has its own battery, and recharges gently (under 3 amps)
> from the accessory port.  6 watts of RF power to a glass-mount antenna
> is also unlikely to upset any of the car's electronics.  Seems to work
pretty well.
>
> All that said, when a Tesla is in party or camper mode, I expect car is
"on"
> and the contactors engaged.  If so, it should be actively supplying
> recharging power to the 12v battery derived from the main pack.  Under
> those circumstances, you probably can get away with pulling a few
> hundred watts from there on those cars.  It could be a good power
> source for emergency digital communications (Winlink, APRS), but I
> seriously would not recommend running your house from it.
>
> Greg  KO6TH
>
>
> Robert Bruninga wrote:
>> Tesla is releasing Field-Day mode (er, "party mode") in its models to
>> allow the vehicle to continue with AC/Heating, Temperature control,
>> airflow, selective lights and music for up to 48 hours or more while
>> in Park.  The feature will also allow users to power other electric
>> devices using the electric car's battery.
>>
>> When  you think about it, the 75 kWh battery in the model 3 or the 60
>> kWh of the Chevy Bolt can run the average American home at normal
>> loads for about 3 days, or a week under power saving conditions.
>> With about $1000 or more of solar panels , you can have
>> transportation and also maintain that Field Day forever. ;-)
>>
>> Just sayin...
>>
>> Bob, Wb4APR
>>
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