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Re: Solar Charging Port
by Cor van de Water
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For their system design, the first question to ask
is if they require the solar/wind system to deliver
charge (into a battery bank) while the car is not there
or only directly into the car's pack.
In the first case you have effectively split the problem
into two with one easy to solve, as it is a standard
solar/wind situation with adequate market supply.
Only the part how to transfer power from the solar/wind
battery bank into the car's pack is new, but this has
also been done.
If you want to go entirely with off-the-shelf components
then it is as simple as using a (good - preferably sine-wave)
inverter and plugging the car's charger into that as if it
were "the grid".
If you want to make it less costly and more efficient
then you should look for a charger that can accept the
(low) DC input voltage from the solar/wind bank.
If you just need a cheaper/scrounge-solution then you
could use any cheap UPS that often can be had for a
song when its battery is tired, rip out that battery
and hook it up to your solar/wind bank (proper fusing).
That will give you standard grid AC power to plug the
charger into.
The other solution (without bank) can be more efficient
if the car is normally parked there during the day, it
also avoids the extra battery bank (expense, maintenance)
but requires to size the solar and wind solutions to the
car's pack, or (what I was suggesting before) using a
DC/DC converter to adapt the typical and abundantly
available solar and wind component output voltage to
the car's pack voltage.
When you can give more guidance which direction the
system design is going then we can give more guidance.
Success,
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 ev
Sent: Friday, November 14, 2008 3:14 AM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Solar Charging Port
Direct feed to the batteries sounds simple, but it no longer gives me an
intelligent charging profile. (isn't it kind of like a "bad solar boy"
charger?")
I would like to use a charger with a direct feed from the solar
panels, but at that high of a voltage, the available line current is
going to be pretty low. I don't know of a charger that can easily
accept a varying level of supply voltage/current like that. Obviously
the best answer to an efficient system seems to sell the solar power
back to the grid during the day, and charge the car off the grid at
night but I think that defeats the purpose of their project.
Also, the ability to have a parallel supply (both solar and wind) at the
same time is an option we wanted to consider. I am sure that gear to
handle this scenario exists, it's just nothing I have played with
before.
-----Original Message-----
From: ev-bounces@... [mailto:ev-bounces@...] On
Behalf Of Cor van de Water
Sent: Thursday, November 13, 2008 3:27 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] 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.
--
View this message in context:
http://www.nabble.com/Solar-Charging-Port-tp20482420p20482420.html
Sent from the Electric Vehicle Discussion List mailing list archive at
Nabble.com.
_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
is if they require the solar/wind system to deliver
charge (into a battery bank) while the car is not there
or only directly into the car's pack.
In the first case you have effectively split the problem
into two with one easy to solve, as it is a standard
solar/wind situation with adequate market supply.
Only the part how to transfer power from the solar/wind
battery bank into the car's pack is new, but this has
also been done.
If you want to go entirely with off-the-shelf components
then it is as simple as using a (good - preferably sine-wave)
inverter and plugging the car's charger into that as if it
were "the grid".
If you want to make it less costly and more efficient
then you should look for a charger that can accept the
(low) DC input voltage from the solar/wind bank.
If you just need a cheaper/scrounge-solution then you
could use any cheap UPS that often can be had for a
song when its battery is tired, rip out that battery
and hook it up to your solar/wind bank (proper fusing).
That will give you standard grid AC power to plug the
charger into.
The other solution (without bank) can be more efficient
if the car is normally parked there during the day, it
also avoids the extra battery bank (expense, maintenance)
but requires to size the solar and wind solutions to the
car's pack, or (what I was suggesting before) using a
DC/DC converter to adapt the typical and abundantly
available solar and wind component output voltage to
the car's pack voltage.
When you can give more guidance which direction the
system design is going then we can give more guidance.
Success,
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 ev
Sent: Friday, November 14, 2008 3:14 AM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Solar Charging Port
Direct feed to the batteries sounds simple, but it no longer gives me an
intelligent charging profile. (isn't it kind of like a "bad solar boy"
charger?")
I would like to use a charger with a direct feed from the solar
panels, but at that high of a voltage, the available line current is
going to be pretty low. I don't know of a charger that can easily
accept a varying level of supply voltage/current like that. Obviously
the best answer to an efficient system seems to sell the solar power
back to the grid during the day, and charge the car off the grid at
night but I think that defeats the purpose of their project.
Also, the ability to have a parallel supply (both solar and wind) at the
same time is an option we wanted to consider. I am sure that gear to
handle this scenario exists, it's just nothing I have played with
before.
-----Original Message-----
From: ev-bounces@... [mailto:ev-bounces@...] On
Behalf Of Cor van de Water
Sent: Thursday, November 13, 2008 3:27 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] 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.
--
View this message in context:
http://www.nabble.com/Solar-Charging-Port-tp20482420p20482420.html
Sent from the Electric Vehicle Discussion List mailing list archive at
Nabble.com.
_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
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