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
al...@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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