[RE-wrenches] Discharging a high voltage battery

[Jerry Shafer]

Wrenches
I agree with Brian, l get this question from customers all the time going
back many years. First of all, my questions in responce start with why,
maybe peak load sheding ok, second question now what, you did the peak shed
now you need to recharge that battery. Last thing you you should do is
deplete the range your car has and cycling of the battery does also have an
prolonged reduction in life cycle of the battery. Who would want to
warranty that.
Sure it might sound like an untapped resource, maybe end of the world stuff
when nothing matters but would you such all the gas out of your car to run
your house, then what, not me. Not a good long term solution


On Feb 22, 2017 10:00 AM, "Brian Teitelbaum" <bteitelbaum at aeesolar.com>
wrote:

Hi Larry,



This is not a new idea. It’s called “Vehicle-to-Grid” or “V2G”, and is a
big subject of discussion in Europe.



If everyone had an electric vehicle in their driveway, it would represent a
huge (yuge?) distributed battery bank over the whole country. I think
that’s a great idea.



As far as I know, the SolarEdge “StorEdge” 7.6 kW inverter is the only
inverter with this capability right now, although many other inverter
companies are working on inverters that can operate with high-voltage
batteries. The StorEdge is designed to work with the Tesla home battery,
which is basically a smaller version of the Model-S battery pack. The
inverter would have to be programmable to work with the battery’s BMS, and
limit the discharge so that the vehicle’s battery is only drained to some
set-point. You wouldn’t want to completely drain the battery, at least not
if you want to use the vehicle.



I doubt that it would make any economic sense at this point in time, but
the future is bright.



Brian

AEE Solar







*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Starlight Solar Power Systems
*Sent:* Wednesday, February 22, 2017 11:17 AM
*To:* RE-wrenches
*Subject:* [RE-wrenches] Discharging a high voltage battery



Hello Wrenches,



Someone has asked me about discharging their EV battery into the grid. They
have an existing grit tie system. What they want to do is connect a 5kW
grid tie inverter to their 340 volt, 32kWh EV battery bank and feed the
grid to discharge the battery. Why was not discussed but sure bugs me.



My uneducated guess is the inverter will be immediately damaged. My thought
is how would it limit the input current? Or, is there such an inverter
available that can do the job?



Any input is appreciated.


Larry Crutcher
Starlight Solar Power Systems







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