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

[Andre]

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
>>
>> _______________________________________________
>> aprssig mailing list
>> aprssig at lists.tapr.org
>> http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org
> _______________________________________________
> aprssig mailing list
> aprssig at lists.tapr.org
> http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org
>