Re: Solar Charging Port

Why make things more complicated if you are not (yet) concerned about it
being practical?

The easiest way to get a solar carport to work is to feed the output
directly into the
charger of the car, preferably the charger is a multi-voltage type that
can handle DC input.

Even simpler is to feed it directly into the pack, but then you need a
means to switch it off
(charge controller) and solar output must be higher than pack voltage.
Example: for a car with a 120V pack (10x 12V battery) you will also need
about 10 panels in series
(170V peak, but about 140-150V in normal operation, so just enough to
push the pack to equalisation).
Typically a solar charge controller consist of a passing diode to send
the solar output to the load
and a shorting FET to short-circuit the solar output before the diode.
When the output (pack) voltage is measured to remain below a certain
threshold or else the panels
are shorted, you get what you want: battery pack is protected and can be
connected to the solar roof
as long as you want and over as many days as you want.

Hope this clarifies,

Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email: CWater@...    Private: http://www.cvandewater.com
Skype: cor_van_de_water     IM: cor_van_de_water@...
Tel: +1 408 383 7626        VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040) 23117400x109 XoIP: +31877841130

-----Original Message-----
From: ev-bounces@... [mailto:ev-bounces@...] On
Behalf Of Higgins
Sent: Thursday, November 13, 2008 10:15 PM
To: ev@...
Subject: [EVDL] Solar Charging Port


I will be conducting an EV design/build training seminar for some high
school instructors and one of the objectives of their program is to
build a solar charging carport.  I know that this is not always the most
practical thing to construct, but this is for educational purposes.  I
would like to get some advice from anyone who might be able to point me
in the direction of some ideas.  I am trying to propose the simplest
solution possible; it doesn't need to be as practical as educational (if
it takes a few days to charge the car, that is OK).  I am most
interested in charging techniques, namely how to deal with the fact that
the charger will probably not make a complete charge in a single pass,
and how to best deal with this scenario.
I am assuming that the way to go is for the carport to charge some
flooded cells, which then run thru an inverter, to a 110v charger... but
if the charger only runs a few hours a day, how will that effect a
"smart charging"
cycle.  I am also considering wind power, so a combined solar/wind
scenario might be interesting.
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