A car battery can store cheap electricity
from its own roof. With that, you can then operate the washing machine or
the fridge. The car manufacturer Mitsubishi has presented a corresponding
system - in Japan, it already works. Visit
this website for details about AGM battery selection test.
A washing machine consumed in the standard
program about a kilowatt-hour, a dryer one and a half. This makes them one of
the largest household power consumers. An electric car creates just ten
kilometers with this amount of electricity. However, the battery in the
car has enough power to run a home, says Dennis Lindroth of
Mitsubishi. And so it came with the Japanese automaker on the idea to use
the electricity from the electric car for the apartment:
"And a one-family household with one or
two children consumes about three or three and a half kilowatt-hours a day.
That's enough to supply the house with electricity from the vehicle in one day,
two or three days. "
This is made possible by a bidirectional
charging system in which electricity can flow in both directions between the
house and the car. In Japan, this idea was further developed after the
nuclear disaster in Fukushima.
"It works in Japan. However, they
have a different voltage network, it is not as extensive and complex as in the
USA. That's why it's a bit easier in Japan to do the whole thing
there. Since the main reason was power blackout, so it has been tried
because the homeowner or the public power grids detached from a non-existent
power supply still provide power. "
However, fear of a power outage in the USA is
not a reason to introduce bidirectional charging.
Using solar power from the roof efficiently
Rather, it is about storing the electricity
generated on the house with a solar system when the sun is shining, but the
energy is not consumed immediately. For biochemical engineer Sven Andres
from the University of Hannover, this is one way to make better use of solar
energy.
"As far as I create, this battery makes
sense, because then I have the self-consumption of the electricity that I
generate, and that has a positive effect on the expansion of renewable
energies. So the potential is there that this system also supports the
energy transition. "
Mitsubishi is the first automaker to offer
such a charging system to end-users by mid-year. It can be connected to
another, small backup battery, which remains constant in the basement.
The user should be able to program the whole
system so that enough power remains in the car to start the next drive.
"The battery is never completely
discharged because our vehicle always starts electrically and of course always
needs electricity. The battery management system allows the user to
independently set how much battery capacity should remain in the vehicle.
"
The system runs on the Chademo connection of
the car, which is widespread as a quick charge plug-in, the USA. Dennis
Lindroth asserted that the car buyers need not worry about extra wear on the
battery in the car.
"So the number of charge cycles has no
effect on the longevity of the batteries, on the functioning of the
batteries. We're talking dynamic charging, we do not always have the
highest power to charge or discharge the battery, it does fluctuate a bit, so
it's battery saver. "
Hurdles for connecting to the public network
Theoretically, the car could not only be
connected to the home network, but also to the public electricity
grid. There it would provide for stabilization or used as remotely
controllable power storage. But there are still legal hurdles, such as the
Renewable Energy Act, EEG, says Markus Duchon from the Fortis Research
Institute in Bavaria.
"We are dealing here with power storage,
there are just the discussions, whether one then does not fall into the whole
EEG regulations. Where in the case of storage loading and unloading the
EEG apportionment would be due? "
However, electric cars can safely couple
their own home with their car, making better use of their self-generated solar
power.
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