[RE-wrenches] Fwd: Car charging station without grid

[boB Gudgel]

On 7/14/2011 1:43 PM, Allan Sindelar wrote:
> Wrenches,
> I'm stumped as to the best approach for a customer who wants a 
> non-grid-tied, batteryless PV-powered EV charging station. See below, 
> from one of our salespeople. Any ideas?
> Thank you,
> Allan
>


So, does this car in the car charging station not use batteries ?

If not, what does the charging station charge ?

Is he sure that he just doesn't need a charger for high voltage batteries ?

boB




> -------- Original Message --------
>
> Allan:
> Monday I sit down with an interesting fellow who sounds like a 
> potential good customer (has money and right enviro goals) - in SF.
> He brought up the idea of discussing a car charging station for future 
> electric car that:
>
>    1. stands alone, no grid connection
>    2. no batteries - he pictures his car is home most days - he parks
>       it and when the sun shines it gets charged directly
>
> Why that approach?
>
>    1. He is thinking this must be the most efficient conversion, i.e.
>       directly without batteries or line loss of electrons to and from
>       utility
>    2. Wants the car to function independent of dirty fuel/dirty electrons
>    3. He assumes less equipment; maybe less cost but the cost is not
>       important other than as example for others
>
> Issues I see:
>
>    1. All inverters that can produce the high voltage needed need grid
>       power or if off grid need batteries - know of anything stand
>       alone available?
>    2. Power or voltage fluctuation as panels see more or less sun; ie
>       hours of day or clouds, etc - what will be the output from inverter?
>    3. Without tieing into grid investment in PVs (both his financial
>       and the embodied for manuf.) gets wasted when car fully charged
>       or car not home and sunny.
>    4. Is total amps output in peak sun even going to meet the charging
>       requirements? ie takes 10 days to recharge instead of 4 hours -
>       or overly massive system to match rate of charge?
>
> Your thoughts?
> Karlis
>
>
> *Allan Sindelar*
> _Allan at positiveenergysolar.com_ <mailto:Allan at positiveenergysolar.com>
> NABCEP Certified Photovoltaic Installer
> NABCEP Certified Technical Sales Professional
> New Mexico EE98J Journeyman Electrician
> *Positive Energy, Inc.*
> 3201 Calle Marie
> Santa Fe, New Mexico 87507
> *505 424-1112*
> _www.positiveenergysolar.com_ <http://www.positiveenergysolar.com/>
>
>
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