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

[Joel Davidson]

Hi Allan,

Off-grid batteryless EV charging? Perhaps if the EV battery was tapped to keep the off-grid inverter awake, but that would void the vehicle warranty. I'm sure you considered PV into Sunny Islands (or similar) with a small sealed battery into Sunny Boys. I question if a person in SF who wants an off-grid PV system without batteries to charge a battery vehicle is really a customer.

Good luck,
Joel Davidson
  ----- Original Message ----- 
  From: Allan Sindelar 
  To: RE-wrenches 
  Sent: Thursday, July 14, 2011 1:43 PM
  Subject: [RE-wrenches] Fwd: Car charging station without grid


  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

  -------- 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
  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 


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