Good points but everything does not come down to cost. Technically one does not
need air conditioning but people pay a lot of money for it. For anyone who has
been through a three to 6 day power outage.... a back up that will power
everything looks worth it even if it happens rarely. Of course most people
don't have the money to spare.
On Wednesday, August 7, 2019, 8:03:50 AM CDT, Robert Bruninga via EV
<ev@lists.evdl.org> wrote:
Subject: EV - Powerwall Equivalence
When I give talks on Emergency power to ham radio groups there seem to be
people convinced they need a Powerall for backup of the typical 7 hours
annual power outage. I point out that the average American home draws only
about $1 worth of electricity in 7 hours (here in Maryland) and so spending
$14,000 for $1 worth of electricity a year is something that should get
serious thought.
I say a $200 generator and $15 can of gas is far more cost effective. But
if they really must have a big battery, then I use these two slides to show
people that buying a used EV or Plugin hybrid is a far more economical
investment for emergency power than a power wall.
http://aprs.org/EV-Powerwall.png
A Nissan Leaf 3 years old costs about $9k and has the battery capacity of
THREE Tesla Power walls that cost $21,000. Plus y ou can drive it the other
99.95% of the year for transportation...
A plugin Prius has the battery capacity of a Power wall AND includes a 50 kW
generator for power for a week!
A Volt has the capacity of TWO power walls (Tesla's recommendation) plus the
week long 50kW generator to boot.
HOWEVER, the power wall will be a fantastic investment *when* the utility,
PSC and politicians allow the owner to be paid the full retail value of his
battery contribution back to the grid during peak demand. But that is NOT
here yet. So, don't waste money on a power wall until that comes about..
Then a power wall can pay for itself in 2 years and provide whole-house
battery backup for free! But not now...
Bob, Wb4APR
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