Re: PV: GAS-L: Vehicle-to-Grid Power

["James Joyce" <j.joyce@sri.org.au>]

Cor, read the article at http://www.acpropulsion.com/   that will address
your concern with regards to battery cycle life. AC Propulsion suggest and
my experience is that frequent shallow discharge / recharge cycles don't
seem to do any harm to overall life... ie. 10%-20% DOD with no cell
equalisation. Of course normal operation as an EV with operation to 50% DOD
with occasional cell equalisation will keep the batteries "excercised",
which is also important for charge capacity and to avoid sulphation.

As far as a payback meter goes those of us installing grid interactive
inverters will have one anyway.

The financial benefit arises when the EV is charged with off-peak power (1
to 10 cents/kWh in Australia depending on circumstances) and then returned
to the grid at peak times (15 cents to $50/kWh, again depending on
circumstances). At a domestic scale the pricing is more likely to be 8
cents off-peak to 15 cents peak rather than the numbers that the large
generating companies see, ie. 1 cent off-peak to $50 on the National
Electricity Market.

Of course this presumes that your local distibutor will agree to an
off-peak/peak pricing agreement.


Regards

James






                                                                                               
                    cor_van_de_water@                                                          
                    dolfijn.nl (Cor          To:     <j.joyce@sri.org.au>                      
                    van de Water)            cc:     <pvusers@crest.org>                       
                                             Subject:     Re: PV: GAS-L: Vehicle-to-Grid Power 
                    29/01/01 19:50                                                             
                    Please respond to                                                          
                    cor_van_de_water                                                           
                                                                                               
                                                                                               



My first reaction is: this would surely mean your batteries live short,
as the number of cycles increase without driving it......

I do not think this is economic, but I am not sure about the
cost per cycle of batteries, versus the payback for power
during peak hours.

NOTE:
This should mean an EV user should install a peak-payback meter!?!

If payback and power drawn to re-charge cancel out, then the only
result of the equation is an extra cycle of your EV battery.....

Success,
Cor van de Water
the Netherlands
http://start.at/solar







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