Plug-in Hybrid kWh/day [RE-wrenches]

[Peter Parrish]

Thanks everyone for the feedback on EV. The numbers vary a bit (which is
reassuring, because it means not everyone is sucking each others exhaust)
but the average is about 7 kWh for a 20 mile (RT) commute. Perhaps 5 kWh if
everything is optimum (flat terrain, light foot, high efficiency on all
electronics).

Here in the City of Los Angeles (LADWP) we pay $0.121 per kWh on a
residential flat rate. Time of Use is a discussion for another day, but very
interesting. The "energy cost" per day of an EV commute is $0.85.

A petroleum-based commute at 25 mpg and $4.00 per gallon ($0.16/mi) pencils
out at $3.20 per day.

This is a factor of 3.8 X in favor of EV. But the exercise is really about
PV...

Assuming 4.25 kWh/day/kWp for PV, what I need to do now is look at the
incremental cost of adding another 1.6 kWp of PV for a customer who is
already committed to a grid-tied PV project, amortize the cost over 20
years, taking into account incentives, declining production, etc., and
figure out what the cost per kWh will be. I already know the numbers will be
competitive with purchasing the electricity from LADWP.

I think this tie-in between EV and PV is a winner. Any comments would be
appreciated.

- Peter

  

Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parrish at calsolareng.com 

-----Original Message-----
From: Bill Loesch [mailto:solar1online at charter.net] 
Sent: Tuesday, June 24, 2008 6:51 AM
To: RE-wrenches at topica.com
Subject: [Norton AntiSpam] Re: Plug-in Hybrid kWh/day [RE-wrenches]


Why are we not hearing from Sharky about this electric vehicle stuff?

Bill Loesch

----- Original Message ----- 
From: "Ray Walters" <walters at taosnet.com>
To: <RE-wrenches at topica.com>
Sent: Friday, June 20, 2008 4:04 PM
Subject: Re: Plug-in Hybrid kWh/day [RE-wrenches]


>
>
> My Electric truck pulls about 12 Kw at 45 mph, which works out to
> about 3.75 miles per Kwh. Throw in a charging efficiency of 75% and
> you have 2.8 miles per Kwh.  Figure 3.5 Kwh for that 10 mile trip. Of
> course his #s could be higher or lower, depending on the vehicle,
> speed, hills, starts & stops, charger type, etc. (insert fast talking
> sales disclaimer now....)
>
> Ray
>
>
> On Jun 20, 2008, at 12:30 PM, Peter Parrish wrote:
>
> >
> >
> > I have a client that wants to purchase a PV system that is not only
> > large
> > enough to provide 100% of his historical usage but cover a yet to be
> > purchased plug-in hybrid electric vehicle as well.
> >
> > I told him that I would max out his available space and at the same
> > time
> > inquire about plug-in hybrids.
> >
> > Does anyone know a source of information on estimating the number
> > of kWhs
> > needed for a daily 10 mi one-way commute? I know these puppies are
> > not on
> > the market yet, but someone must have some estimated numbers.
> >
> > Any help would be appreciated.
> >
> > - Peter
> >
> > Peter T. Parrish, President
> > California Solar Engineering, Inc.
> > CA Lic. 854779, NABCEP Cert. 031806-26
> > peter.parrish at calsolareng.com
> >
> >
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>
> R. Walters
> Solarray.com
> NABCEP # 04170442
>
>
>
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